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https://gitlab.com/qemu-project/qemu
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b58c5c2dd2
Commit e35704ba9c "numa: Move NUMA declarations from sysemu.h to
numa.h" left a few NUMA-related macros behind. Move them now.
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20190812052359.30071-26-armbru@redhat.com>
4256 lines
124 KiB
C
4256 lines
124 KiB
C
/*
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* Virtual page mapping
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/target_page.h"
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#include "tcg.h"
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#include "hw/qdev-core.h"
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#include "hw/qdev-properties.h"
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#if !defined(CONFIG_USER_ONLY)
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#include "hw/boards.h"
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#include "hw/xen/xen.h"
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#endif
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#include "sysemu/kvm.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/tcg.h"
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#include "qemu/timer.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qemu/qemu-print.h"
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#if defined(CONFIG_USER_ONLY)
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#include "qemu.h"
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#else /* !CONFIG_USER_ONLY */
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#include "exec/memory.h"
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#include "exec/ioport.h"
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#include "sysemu/dma.h"
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#include "sysemu/hostmem.h"
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#include "sysemu/hw_accel.h"
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#include "exec/address-spaces.h"
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#include "sysemu/xen-mapcache.h"
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#include "trace-root.h"
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#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
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#include <linux/falloc.h>
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#endif
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#endif
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#include "qemu/rcu_queue.h"
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#include "qemu/main-loop.h"
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#include "translate-all.h"
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#include "sysemu/replay.h"
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#include "exec/memory-internal.h"
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#include "exec/ram_addr.h"
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#include "exec/log.h"
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#include "migration/vmstate.h"
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#include "qemu/range.h"
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#ifndef _WIN32
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#include "qemu/mmap-alloc.h"
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#endif
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#include "monitor/monitor.h"
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//#define DEBUG_SUBPAGE
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#if !defined(CONFIG_USER_ONLY)
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/* ram_list is read under rcu_read_lock()/rcu_read_unlock(). Writes
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* are protected by the ramlist lock.
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*/
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RAMList ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list.blocks) };
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static MemoryRegion *system_memory;
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static MemoryRegion *system_io;
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AddressSpace address_space_io;
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AddressSpace address_space_memory;
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MemoryRegion io_mem_rom, io_mem_notdirty;
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static MemoryRegion io_mem_unassigned;
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#endif
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#ifdef TARGET_PAGE_BITS_VARY
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int target_page_bits;
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bool target_page_bits_decided;
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#endif
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CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
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/* current CPU in the current thread. It is only valid inside
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cpu_exec() */
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__thread CPUState *current_cpu;
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/* 0 = Do not count executed instructions.
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1 = Precise instruction counting.
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2 = Adaptive rate instruction counting. */
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int use_icount;
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uintptr_t qemu_host_page_size;
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intptr_t qemu_host_page_mask;
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bool set_preferred_target_page_bits(int bits)
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{
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/* The target page size is the lowest common denominator for all
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* the CPUs in the system, so we can only make it smaller, never
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* larger. And we can't make it smaller once we've committed to
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* a particular size.
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*/
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#ifdef TARGET_PAGE_BITS_VARY
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assert(bits >= TARGET_PAGE_BITS_MIN);
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if (target_page_bits == 0 || target_page_bits > bits) {
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if (target_page_bits_decided) {
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return false;
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}
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target_page_bits = bits;
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}
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#endif
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return true;
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}
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#if !defined(CONFIG_USER_ONLY)
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static void finalize_target_page_bits(void)
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{
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#ifdef TARGET_PAGE_BITS_VARY
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if (target_page_bits == 0) {
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target_page_bits = TARGET_PAGE_BITS_MIN;
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}
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target_page_bits_decided = true;
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#endif
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}
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typedef struct PhysPageEntry PhysPageEntry;
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struct PhysPageEntry {
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/* How many bits skip to next level (in units of L2_SIZE). 0 for a leaf. */
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uint32_t skip : 6;
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/* index into phys_sections (!skip) or phys_map_nodes (skip) */
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uint32_t ptr : 26;
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};
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#define PHYS_MAP_NODE_NIL (((uint32_t)~0) >> 6)
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/* Size of the L2 (and L3, etc) page tables. */
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#define ADDR_SPACE_BITS 64
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#define P_L2_BITS 9
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#define P_L2_SIZE (1 << P_L2_BITS)
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#define P_L2_LEVELS (((ADDR_SPACE_BITS - TARGET_PAGE_BITS - 1) / P_L2_BITS) + 1)
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typedef PhysPageEntry Node[P_L2_SIZE];
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typedef struct PhysPageMap {
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struct rcu_head rcu;
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unsigned sections_nb;
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unsigned sections_nb_alloc;
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unsigned nodes_nb;
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unsigned nodes_nb_alloc;
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Node *nodes;
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MemoryRegionSection *sections;
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} PhysPageMap;
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struct AddressSpaceDispatch {
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MemoryRegionSection *mru_section;
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/* This is a multi-level map on the physical address space.
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* The bottom level has pointers to MemoryRegionSections.
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*/
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PhysPageEntry phys_map;
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PhysPageMap map;
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};
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#define SUBPAGE_IDX(addr) ((addr) & ~TARGET_PAGE_MASK)
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typedef struct subpage_t {
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MemoryRegion iomem;
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FlatView *fv;
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hwaddr base;
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uint16_t sub_section[];
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} subpage_t;
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#define PHYS_SECTION_UNASSIGNED 0
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#define PHYS_SECTION_NOTDIRTY 1
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#define PHYS_SECTION_ROM 2
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#define PHYS_SECTION_WATCH 3
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static void io_mem_init(void);
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static void memory_map_init(void);
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static void tcg_commit(MemoryListener *listener);
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static MemoryRegion io_mem_watch;
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/**
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* CPUAddressSpace: all the information a CPU needs about an AddressSpace
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* @cpu: the CPU whose AddressSpace this is
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* @as: the AddressSpace itself
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* @memory_dispatch: its dispatch pointer (cached, RCU protected)
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* @tcg_as_listener: listener for tracking changes to the AddressSpace
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*/
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struct CPUAddressSpace {
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CPUState *cpu;
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AddressSpace *as;
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struct AddressSpaceDispatch *memory_dispatch;
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MemoryListener tcg_as_listener;
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};
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struct DirtyBitmapSnapshot {
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ram_addr_t start;
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ram_addr_t end;
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unsigned long dirty[];
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};
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#endif
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#if !defined(CONFIG_USER_ONLY)
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static void phys_map_node_reserve(PhysPageMap *map, unsigned nodes)
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{
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static unsigned alloc_hint = 16;
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if (map->nodes_nb + nodes > map->nodes_nb_alloc) {
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map->nodes_nb_alloc = MAX(map->nodes_nb_alloc, alloc_hint);
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map->nodes_nb_alloc = MAX(map->nodes_nb_alloc, map->nodes_nb + nodes);
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map->nodes = g_renew(Node, map->nodes, map->nodes_nb_alloc);
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alloc_hint = map->nodes_nb_alloc;
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}
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}
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static uint32_t phys_map_node_alloc(PhysPageMap *map, bool leaf)
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{
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unsigned i;
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uint32_t ret;
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PhysPageEntry e;
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PhysPageEntry *p;
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ret = map->nodes_nb++;
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p = map->nodes[ret];
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assert(ret != PHYS_MAP_NODE_NIL);
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assert(ret != map->nodes_nb_alloc);
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e.skip = leaf ? 0 : 1;
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e.ptr = leaf ? PHYS_SECTION_UNASSIGNED : PHYS_MAP_NODE_NIL;
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for (i = 0; i < P_L2_SIZE; ++i) {
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memcpy(&p[i], &e, sizeof(e));
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}
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return ret;
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}
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static void phys_page_set_level(PhysPageMap *map, PhysPageEntry *lp,
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hwaddr *index, hwaddr *nb, uint16_t leaf,
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int level)
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{
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PhysPageEntry *p;
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hwaddr step = (hwaddr)1 << (level * P_L2_BITS);
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if (lp->skip && lp->ptr == PHYS_MAP_NODE_NIL) {
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lp->ptr = phys_map_node_alloc(map, level == 0);
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}
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p = map->nodes[lp->ptr];
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lp = &p[(*index >> (level * P_L2_BITS)) & (P_L2_SIZE - 1)];
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while (*nb && lp < &p[P_L2_SIZE]) {
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if ((*index & (step - 1)) == 0 && *nb >= step) {
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lp->skip = 0;
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lp->ptr = leaf;
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*index += step;
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*nb -= step;
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} else {
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phys_page_set_level(map, lp, index, nb, leaf, level - 1);
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}
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++lp;
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}
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}
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static void phys_page_set(AddressSpaceDispatch *d,
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hwaddr index, hwaddr nb,
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uint16_t leaf)
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{
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/* Wildly overreserve - it doesn't matter much. */
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phys_map_node_reserve(&d->map, 3 * P_L2_LEVELS);
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phys_page_set_level(&d->map, &d->phys_map, &index, &nb, leaf, P_L2_LEVELS - 1);
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}
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/* Compact a non leaf page entry. Simply detect that the entry has a single child,
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* and update our entry so we can skip it and go directly to the destination.
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*/
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static void phys_page_compact(PhysPageEntry *lp, Node *nodes)
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{
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unsigned valid_ptr = P_L2_SIZE;
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int valid = 0;
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PhysPageEntry *p;
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int i;
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if (lp->ptr == PHYS_MAP_NODE_NIL) {
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return;
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}
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p = nodes[lp->ptr];
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for (i = 0; i < P_L2_SIZE; i++) {
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if (p[i].ptr == PHYS_MAP_NODE_NIL) {
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continue;
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}
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valid_ptr = i;
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valid++;
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if (p[i].skip) {
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phys_page_compact(&p[i], nodes);
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}
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}
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/* We can only compress if there's only one child. */
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if (valid != 1) {
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return;
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}
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assert(valid_ptr < P_L2_SIZE);
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/* Don't compress if it won't fit in the # of bits we have. */
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if (lp->skip + p[valid_ptr].skip >= (1 << 3)) {
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return;
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}
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lp->ptr = p[valid_ptr].ptr;
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if (!p[valid_ptr].skip) {
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/* If our only child is a leaf, make this a leaf. */
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/* By design, we should have made this node a leaf to begin with so we
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* should never reach here.
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* But since it's so simple to handle this, let's do it just in case we
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* change this rule.
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*/
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lp->skip = 0;
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} else {
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lp->skip += p[valid_ptr].skip;
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}
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}
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void address_space_dispatch_compact(AddressSpaceDispatch *d)
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{
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if (d->phys_map.skip) {
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phys_page_compact(&d->phys_map, d->map.nodes);
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}
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}
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static inline bool section_covers_addr(const MemoryRegionSection *section,
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hwaddr addr)
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{
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/* Memory topology clips a memory region to [0, 2^64); size.hi > 0 means
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* the section must cover the entire address space.
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*/
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return int128_gethi(section->size) ||
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range_covers_byte(section->offset_within_address_space,
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int128_getlo(section->size), addr);
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}
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static MemoryRegionSection *phys_page_find(AddressSpaceDispatch *d, hwaddr addr)
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{
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PhysPageEntry lp = d->phys_map, *p;
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Node *nodes = d->map.nodes;
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MemoryRegionSection *sections = d->map.sections;
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hwaddr index = addr >> TARGET_PAGE_BITS;
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int i;
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for (i = P_L2_LEVELS; lp.skip && (i -= lp.skip) >= 0;) {
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if (lp.ptr == PHYS_MAP_NODE_NIL) {
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return §ions[PHYS_SECTION_UNASSIGNED];
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}
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p = nodes[lp.ptr];
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lp = p[(index >> (i * P_L2_BITS)) & (P_L2_SIZE - 1)];
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}
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if (section_covers_addr(§ions[lp.ptr], addr)) {
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return §ions[lp.ptr];
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} else {
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return §ions[PHYS_SECTION_UNASSIGNED];
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}
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}
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/* Called from RCU critical section */
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static MemoryRegionSection *address_space_lookup_region(AddressSpaceDispatch *d,
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hwaddr addr,
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bool resolve_subpage)
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{
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MemoryRegionSection *section = atomic_read(&d->mru_section);
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subpage_t *subpage;
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if (!section || section == &d->map.sections[PHYS_SECTION_UNASSIGNED] ||
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!section_covers_addr(section, addr)) {
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section = phys_page_find(d, addr);
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atomic_set(&d->mru_section, section);
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}
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if (resolve_subpage && section->mr->subpage) {
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subpage = container_of(section->mr, subpage_t, iomem);
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section = &d->map.sections[subpage->sub_section[SUBPAGE_IDX(addr)]];
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}
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return section;
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}
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/* Called from RCU critical section */
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static MemoryRegionSection *
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address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *xlat,
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hwaddr *plen, bool resolve_subpage)
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{
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MemoryRegionSection *section;
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MemoryRegion *mr;
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Int128 diff;
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section = address_space_lookup_region(d, addr, resolve_subpage);
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/* Compute offset within MemoryRegionSection */
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addr -= section->offset_within_address_space;
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|
|
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/* Compute offset within MemoryRegion */
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*xlat = addr + section->offset_within_region;
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mr = section->mr;
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|
|
|
/* MMIO registers can be expected to perform full-width accesses based only
|
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* on their address, without considering adjacent registers that could
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|
* decode to completely different MemoryRegions. When such registers
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* exist (e.g. I/O ports 0xcf8 and 0xcf9 on most PC chipsets), MMIO
|
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* regions overlap wildly. For this reason we cannot clamp the accesses
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|
* here.
|
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*
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* If the length is small (as is the case for address_space_ldl/stl),
|
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* everything works fine. If the incoming length is large, however,
|
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* the caller really has to do the clamping through memory_access_size.
|
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*/
|
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if (memory_region_is_ram(mr)) {
|
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diff = int128_sub(section->size, int128_make64(addr));
|
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*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
|
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}
|
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return section;
|
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}
|
|
|
|
/**
|
|
* address_space_translate_iommu - translate an address through an IOMMU
|
|
* memory region and then through the target address space.
|
|
*
|
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* @iommu_mr: the IOMMU memory region that we start the translation from
|
|
* @addr: the address to be translated through the MMU
|
|
* @xlat: the translated address offset within the destination memory region.
|
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* It cannot be %NULL.
|
|
* @plen_out: valid read/write length of the translated address. It
|
|
* cannot be %NULL.
|
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* @page_mask_out: page mask for the translated address. This
|
|
* should only be meaningful for IOMMU translated
|
|
* addresses, since there may be huge pages that this bit
|
|
* would tell. It can be %NULL if we don't care about it.
|
|
* @is_write: whether the translation operation is for write
|
|
* @is_mmio: whether this can be MMIO, set true if it can
|
|
* @target_as: the address space targeted by the IOMMU
|
|
* @attrs: transaction attributes
|
|
*
|
|
* This function is called from RCU critical section. It is the common
|
|
* part of flatview_do_translate and address_space_translate_cached.
|
|
*/
|
|
static MemoryRegionSection address_space_translate_iommu(IOMMUMemoryRegion *iommu_mr,
|
|
hwaddr *xlat,
|
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hwaddr *plen_out,
|
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hwaddr *page_mask_out,
|
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bool is_write,
|
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bool is_mmio,
|
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AddressSpace **target_as,
|
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MemTxAttrs attrs)
|
|
{
|
|
MemoryRegionSection *section;
|
|
hwaddr page_mask = (hwaddr)-1;
|
|
|
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do {
|
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hwaddr addr = *xlat;
|
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IOMMUMemoryRegionClass *imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
|
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int iommu_idx = 0;
|
|
IOMMUTLBEntry iotlb;
|
|
|
|
if (imrc->attrs_to_index) {
|
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iommu_idx = imrc->attrs_to_index(iommu_mr, attrs);
|
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}
|
|
|
|
iotlb = imrc->translate(iommu_mr, addr, is_write ?
|
|
IOMMU_WO : IOMMU_RO, iommu_idx);
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|
|
|
if (!(iotlb.perm & (1 << is_write))) {
|
|
goto unassigned;
|
|
}
|
|
|
|
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
|
|
| (addr & iotlb.addr_mask));
|
|
page_mask &= iotlb.addr_mask;
|
|
*plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
|
|
*target_as = iotlb.target_as;
|
|
|
|
section = address_space_translate_internal(
|
|
address_space_to_dispatch(iotlb.target_as), addr, xlat,
|
|
plen_out, is_mmio);
|
|
|
|
iommu_mr = memory_region_get_iommu(section->mr);
|
|
} while (unlikely(iommu_mr));
|
|
|
|
if (page_mask_out) {
|
|
*page_mask_out = page_mask;
|
|
}
|
|
return *section;
|
|
|
|
unassigned:
|
|
return (MemoryRegionSection) { .mr = &io_mem_unassigned };
|
|
}
|
|
|
|
/**
|
|
* flatview_do_translate - translate an address in FlatView
|
|
*
|
|
* @fv: the flat view that we want to translate on
|
|
* @addr: the address to be translated in above address space
|
|
* @xlat: the translated address offset within memory region. It
|
|
* cannot be @NULL.
|
|
* @plen_out: valid read/write length of the translated address. It
|
|
* can be @NULL when we don't care about it.
|
|
* @page_mask_out: page mask for the translated address. This
|
|
* should only be meaningful for IOMMU translated
|
|
* addresses, since there may be huge pages that this bit
|
|
* would tell. It can be @NULL if we don't care about it.
|
|
* @is_write: whether the translation operation is for write
|
|
* @is_mmio: whether this can be MMIO, set true if it can
|
|
* @target_as: the address space targeted by the IOMMU
|
|
* @attrs: memory transaction attributes
|
|
*
|
|
* This function is called from RCU critical section
|
|
*/
|
|
static MemoryRegionSection flatview_do_translate(FlatView *fv,
|
|
hwaddr addr,
|
|
hwaddr *xlat,
|
|
hwaddr *plen_out,
|
|
hwaddr *page_mask_out,
|
|
bool is_write,
|
|
bool is_mmio,
|
|
AddressSpace **target_as,
|
|
MemTxAttrs attrs)
|
|
{
|
|
MemoryRegionSection *section;
|
|
IOMMUMemoryRegion *iommu_mr;
|
|
hwaddr plen = (hwaddr)(-1);
|
|
|
|
if (!plen_out) {
|
|
plen_out = &plen;
|
|
}
|
|
|
|
section = address_space_translate_internal(
|
|
flatview_to_dispatch(fv), addr, xlat,
|
|
plen_out, is_mmio);
|
|
|
|
iommu_mr = memory_region_get_iommu(section->mr);
|
|
if (unlikely(iommu_mr)) {
|
|
return address_space_translate_iommu(iommu_mr, xlat,
|
|
plen_out, page_mask_out,
|
|
is_write, is_mmio,
|
|
target_as, attrs);
|
|
}
|
|
if (page_mask_out) {
|
|
/* Not behind an IOMMU, use default page size. */
|
|
*page_mask_out = ~TARGET_PAGE_MASK;
|
|
}
|
|
|
|
return *section;
|
|
}
|
|
|
|
/* Called from RCU critical section */
|
|
IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr,
|
|
bool is_write, MemTxAttrs attrs)
|
|
{
|
|
MemoryRegionSection section;
|
|
hwaddr xlat, page_mask;
|
|
|
|
/*
|
|
* This can never be MMIO, and we don't really care about plen,
|
|
* but page mask.
|
|
*/
|
|
section = flatview_do_translate(address_space_to_flatview(as), addr, &xlat,
|
|
NULL, &page_mask, is_write, false, &as,
|
|
attrs);
|
|
|
|
/* Illegal translation */
|
|
if (section.mr == &io_mem_unassigned) {
|
|
goto iotlb_fail;
|
|
}
|
|
|
|
/* Convert memory region offset into address space offset */
|
|
xlat += section.offset_within_address_space -
|
|
section.offset_within_region;
|
|
|
|
return (IOMMUTLBEntry) {
|
|
.target_as = as,
|
|
.iova = addr & ~page_mask,
|
|
.translated_addr = xlat & ~page_mask,
|
|
.addr_mask = page_mask,
|
|
/* IOTLBs are for DMAs, and DMA only allows on RAMs. */
|
|
.perm = IOMMU_RW,
|
|
};
|
|
|
|
iotlb_fail:
|
|
return (IOMMUTLBEntry) {0};
|
|
}
|
|
|
|
/* Called from RCU critical section */
|
|
MemoryRegion *flatview_translate(FlatView *fv, hwaddr addr, hwaddr *xlat,
|
|
hwaddr *plen, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
MemoryRegion *mr;
|
|
MemoryRegionSection section;
|
|
AddressSpace *as = NULL;
|
|
|
|
/* This can be MMIO, so setup MMIO bit. */
|
|
section = flatview_do_translate(fv, addr, xlat, plen, NULL,
|
|
is_write, true, &as, attrs);
|
|
mr = section.mr;
|
|
|
|
if (xen_enabled() && memory_access_is_direct(mr, is_write)) {
|
|
hwaddr page = ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - addr;
|
|
*plen = MIN(page, *plen);
|
|
}
|
|
|
|
return mr;
|
|
}
|
|
|
|
typedef struct TCGIOMMUNotifier {
|
|
IOMMUNotifier n;
|
|
MemoryRegion *mr;
|
|
CPUState *cpu;
|
|
int iommu_idx;
|
|
bool active;
|
|
} TCGIOMMUNotifier;
|
|
|
|
static void tcg_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
|
|
{
|
|
TCGIOMMUNotifier *notifier = container_of(n, TCGIOMMUNotifier, n);
|
|
|
|
if (!notifier->active) {
|
|
return;
|
|
}
|
|
tlb_flush(notifier->cpu);
|
|
notifier->active = false;
|
|
/* We leave the notifier struct on the list to avoid reallocating it later.
|
|
* Generally the number of IOMMUs a CPU deals with will be small.
|
|
* In any case we can't unregister the iommu notifier from a notify
|
|
* callback.
|
|
*/
|
|
}
|
|
|
|
static void tcg_register_iommu_notifier(CPUState *cpu,
|
|
IOMMUMemoryRegion *iommu_mr,
|
|
int iommu_idx)
|
|
{
|
|
/* Make sure this CPU has an IOMMU notifier registered for this
|
|
* IOMMU/IOMMU index combination, so that we can flush its TLB
|
|
* when the IOMMU tells us the mappings we've cached have changed.
|
|
*/
|
|
MemoryRegion *mr = MEMORY_REGION(iommu_mr);
|
|
TCGIOMMUNotifier *notifier;
|
|
int i;
|
|
|
|
for (i = 0; i < cpu->iommu_notifiers->len; i++) {
|
|
notifier = g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i);
|
|
if (notifier->mr == mr && notifier->iommu_idx == iommu_idx) {
|
|
break;
|
|
}
|
|
}
|
|
if (i == cpu->iommu_notifiers->len) {
|
|
/* Not found, add a new entry at the end of the array */
|
|
cpu->iommu_notifiers = g_array_set_size(cpu->iommu_notifiers, i + 1);
|
|
notifier = g_new0(TCGIOMMUNotifier, 1);
|
|
g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i) = notifier;
|
|
|
|
notifier->mr = mr;
|
|
notifier->iommu_idx = iommu_idx;
|
|
notifier->cpu = cpu;
|
|
/* Rather than trying to register interest in the specific part
|
|
* of the iommu's address space that we've accessed and then
|
|
* expand it later as subsequent accesses touch more of it, we
|
|
* just register interest in the whole thing, on the assumption
|
|
* that iommu reconfiguration will be rare.
|
|
*/
|
|
iommu_notifier_init(¬ifier->n,
|
|
tcg_iommu_unmap_notify,
|
|
IOMMU_NOTIFIER_UNMAP,
|
|
0,
|
|
HWADDR_MAX,
|
|
iommu_idx);
|
|
memory_region_register_iommu_notifier(notifier->mr, ¬ifier->n);
|
|
}
|
|
|
|
if (!notifier->active) {
|
|
notifier->active = true;
|
|
}
|
|
}
|
|
|
|
static void tcg_iommu_free_notifier_list(CPUState *cpu)
|
|
{
|
|
/* Destroy the CPU's notifier list */
|
|
int i;
|
|
TCGIOMMUNotifier *notifier;
|
|
|
|
for (i = 0; i < cpu->iommu_notifiers->len; i++) {
|
|
notifier = g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i);
|
|
memory_region_unregister_iommu_notifier(notifier->mr, ¬ifier->n);
|
|
g_free(notifier);
|
|
}
|
|
g_array_free(cpu->iommu_notifiers, true);
|
|
}
|
|
|
|
/* Called from RCU critical section */
|
|
MemoryRegionSection *
|
|
address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
|
|
hwaddr *xlat, hwaddr *plen,
|
|
MemTxAttrs attrs, int *prot)
|
|
{
|
|
MemoryRegionSection *section;
|
|
IOMMUMemoryRegion *iommu_mr;
|
|
IOMMUMemoryRegionClass *imrc;
|
|
IOMMUTLBEntry iotlb;
|
|
int iommu_idx;
|
|
AddressSpaceDispatch *d = atomic_rcu_read(&cpu->cpu_ases[asidx].memory_dispatch);
|
|
|
|
for (;;) {
|
|
section = address_space_translate_internal(d, addr, &addr, plen, false);
|
|
|
|
iommu_mr = memory_region_get_iommu(section->mr);
|
|
if (!iommu_mr) {
|
|
break;
|
|
}
|
|
|
|
imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
|
|
|
|
iommu_idx = imrc->attrs_to_index(iommu_mr, attrs);
|
|
tcg_register_iommu_notifier(cpu, iommu_mr, iommu_idx);
|
|
/* We need all the permissions, so pass IOMMU_NONE so the IOMMU
|
|
* doesn't short-cut its translation table walk.
|
|
*/
|
|
iotlb = imrc->translate(iommu_mr, addr, IOMMU_NONE, iommu_idx);
|
|
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
|
|
| (addr & iotlb.addr_mask));
|
|
/* Update the caller's prot bits to remove permissions the IOMMU
|
|
* is giving us a failure response for. If we get down to no
|
|
* permissions left at all we can give up now.
|
|
*/
|
|
if (!(iotlb.perm & IOMMU_RO)) {
|
|
*prot &= ~(PAGE_READ | PAGE_EXEC);
|
|
}
|
|
if (!(iotlb.perm & IOMMU_WO)) {
|
|
*prot &= ~PAGE_WRITE;
|
|
}
|
|
|
|
if (!*prot) {
|
|
goto translate_fail;
|
|
}
|
|
|
|
d = flatview_to_dispatch(address_space_to_flatview(iotlb.target_as));
|
|
}
|
|
|
|
assert(!memory_region_is_iommu(section->mr));
|
|
*xlat = addr;
|
|
return section;
|
|
|
|
translate_fail:
|
|
return &d->map.sections[PHYS_SECTION_UNASSIGNED];
|
|
}
|
|
#endif
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
|
|
static int cpu_common_post_load(void *opaque, int version_id)
|
|
{
|
|
CPUState *cpu = opaque;
|
|
|
|
/* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
|
|
version_id is increased. */
|
|
cpu->interrupt_request &= ~0x01;
|
|
tlb_flush(cpu);
|
|
|
|
/* loadvm has just updated the content of RAM, bypassing the
|
|
* usual mechanisms that ensure we flush TBs for writes to
|
|
* memory we've translated code from. So we must flush all TBs,
|
|
* which will now be stale.
|
|
*/
|
|
tb_flush(cpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpu_common_pre_load(void *opaque)
|
|
{
|
|
CPUState *cpu = opaque;
|
|
|
|
cpu->exception_index = -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool cpu_common_exception_index_needed(void *opaque)
|
|
{
|
|
CPUState *cpu = opaque;
|
|
|
|
return tcg_enabled() && cpu->exception_index != -1;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_cpu_common_exception_index = {
|
|
.name = "cpu_common/exception_index",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = cpu_common_exception_index_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_INT32(exception_index, CPUState),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static bool cpu_common_crash_occurred_needed(void *opaque)
|
|
{
|
|
CPUState *cpu = opaque;
|
|
|
|
return cpu->crash_occurred;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_cpu_common_crash_occurred = {
|
|
.name = "cpu_common/crash_occurred",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = cpu_common_crash_occurred_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_BOOL(crash_occurred, CPUState),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
const VMStateDescription vmstate_cpu_common = {
|
|
.name = "cpu_common",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.pre_load = cpu_common_pre_load,
|
|
.post_load = cpu_common_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(halted, CPUState),
|
|
VMSTATE_UINT32(interrupt_request, CPUState),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.subsections = (const VMStateDescription*[]) {
|
|
&vmstate_cpu_common_exception_index,
|
|
&vmstate_cpu_common_crash_occurred,
|
|
NULL
|
|
}
|
|
};
|
|
|
|
#endif
|
|
|
|
CPUState *qemu_get_cpu(int index)
|
|
{
|
|
CPUState *cpu;
|
|
|
|
CPU_FOREACH(cpu) {
|
|
if (cpu->cpu_index == index) {
|
|
return cpu;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
void cpu_address_space_init(CPUState *cpu, int asidx,
|
|
const char *prefix, MemoryRegion *mr)
|
|
{
|
|
CPUAddressSpace *newas;
|
|
AddressSpace *as = g_new0(AddressSpace, 1);
|
|
char *as_name;
|
|
|
|
assert(mr);
|
|
as_name = g_strdup_printf("%s-%d", prefix, cpu->cpu_index);
|
|
address_space_init(as, mr, as_name);
|
|
g_free(as_name);
|
|
|
|
/* Target code should have set num_ases before calling us */
|
|
assert(asidx < cpu->num_ases);
|
|
|
|
if (asidx == 0) {
|
|
/* address space 0 gets the convenience alias */
|
|
cpu->as = as;
|
|
}
|
|
|
|
/* KVM cannot currently support multiple address spaces. */
|
|
assert(asidx == 0 || !kvm_enabled());
|
|
|
|
if (!cpu->cpu_ases) {
|
|
cpu->cpu_ases = g_new0(CPUAddressSpace, cpu->num_ases);
|
|
}
|
|
|
|
newas = &cpu->cpu_ases[asidx];
|
|
newas->cpu = cpu;
|
|
newas->as = as;
|
|
if (tcg_enabled()) {
|
|
newas->tcg_as_listener.commit = tcg_commit;
|
|
memory_listener_register(&newas->tcg_as_listener, as);
|
|
}
|
|
}
|
|
|
|
AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
|
|
{
|
|
/* Return the AddressSpace corresponding to the specified index */
|
|
return cpu->cpu_ases[asidx].as;
|
|
}
|
|
#endif
|
|
|
|
void cpu_exec_unrealizefn(CPUState *cpu)
|
|
{
|
|
CPUClass *cc = CPU_GET_CLASS(cpu);
|
|
|
|
cpu_list_remove(cpu);
|
|
|
|
if (cc->vmsd != NULL) {
|
|
vmstate_unregister(NULL, cc->vmsd, cpu);
|
|
}
|
|
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
|
|
vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
|
|
}
|
|
#ifndef CONFIG_USER_ONLY
|
|
tcg_iommu_free_notifier_list(cpu);
|
|
#endif
|
|
}
|
|
|
|
Property cpu_common_props[] = {
|
|
#ifndef CONFIG_USER_ONLY
|
|
/* Create a memory property for softmmu CPU object,
|
|
* so users can wire up its memory. (This can't go in qom/cpu.c
|
|
* because that file is compiled only once for both user-mode
|
|
* and system builds.) The default if no link is set up is to use
|
|
* the system address space.
|
|
*/
|
|
DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
|
|
MemoryRegion *),
|
|
#endif
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
void cpu_exec_initfn(CPUState *cpu)
|
|
{
|
|
cpu->as = NULL;
|
|
cpu->num_ases = 0;
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
cpu->thread_id = qemu_get_thread_id();
|
|
cpu->memory = system_memory;
|
|
object_ref(OBJECT(cpu->memory));
|
|
#endif
|
|
}
|
|
|
|
void cpu_exec_realizefn(CPUState *cpu, Error **errp)
|
|
{
|
|
CPUClass *cc = CPU_GET_CLASS(cpu);
|
|
static bool tcg_target_initialized;
|
|
|
|
cpu_list_add(cpu);
|
|
|
|
if (tcg_enabled() && !tcg_target_initialized) {
|
|
tcg_target_initialized = true;
|
|
cc->tcg_initialize();
|
|
}
|
|
tlb_init(cpu);
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
|
|
vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
|
|
}
|
|
if (cc->vmsd != NULL) {
|
|
vmstate_register(NULL, cpu->cpu_index, cc->vmsd, cpu);
|
|
}
|
|
|
|
cpu->iommu_notifiers = g_array_new(false, true, sizeof(TCGIOMMUNotifier *));
|
|
#endif
|
|
}
|
|
|
|
const char *parse_cpu_option(const char *cpu_option)
|
|
{
|
|
ObjectClass *oc;
|
|
CPUClass *cc;
|
|
gchar **model_pieces;
|
|
const char *cpu_type;
|
|
|
|
model_pieces = g_strsplit(cpu_option, ",", 2);
|
|
if (!model_pieces[0]) {
|
|
error_report("-cpu option cannot be empty");
|
|
exit(1);
|
|
}
|
|
|
|
oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
|
|
if (oc == NULL) {
|
|
error_report("unable to find CPU model '%s'", model_pieces[0]);
|
|
g_strfreev(model_pieces);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
cpu_type = object_class_get_name(oc);
|
|
cc = CPU_CLASS(oc);
|
|
cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
|
|
g_strfreev(model_pieces);
|
|
return cpu_type;
|
|
}
|
|
|
|
#if defined(CONFIG_USER_ONLY)
|
|
void tb_invalidate_phys_addr(target_ulong addr)
|
|
{
|
|
mmap_lock();
|
|
tb_invalidate_phys_page_range(addr, addr + 1, 0);
|
|
mmap_unlock();
|
|
}
|
|
|
|
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
|
|
{
|
|
tb_invalidate_phys_addr(pc);
|
|
}
|
|
#else
|
|
void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
|
|
{
|
|
ram_addr_t ram_addr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 1;
|
|
|
|
if (!tcg_enabled()) {
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
mr = address_space_translate(as, addr, &addr, &l, false, attrs);
|
|
if (!(memory_region_is_ram(mr)
|
|
|| memory_region_is_romd(mr))) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
ram_addr = memory_region_get_ram_addr(mr) + addr;
|
|
tb_invalidate_phys_page_range(ram_addr, ram_addr + 1, 0);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
|
|
{
|
|
MemTxAttrs attrs;
|
|
hwaddr phys = cpu_get_phys_page_attrs_debug(cpu, pc, &attrs);
|
|
int asidx = cpu_asidx_from_attrs(cpu, attrs);
|
|
if (phys != -1) {
|
|
/* Locks grabbed by tb_invalidate_phys_addr */
|
|
tb_invalidate_phys_addr(cpu->cpu_ases[asidx].as,
|
|
phys | (pc & ~TARGET_PAGE_MASK), attrs);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_USER_ONLY)
|
|
void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
|
|
|
|
{
|
|
}
|
|
|
|
int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len,
|
|
int flags)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint)
|
|
{
|
|
}
|
|
|
|
int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
|
|
int flags, CPUWatchpoint **watchpoint)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#else
|
|
/* Add a watchpoint. */
|
|
int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
|
|
int flags, CPUWatchpoint **watchpoint)
|
|
{
|
|
CPUWatchpoint *wp;
|
|
|
|
/* forbid ranges which are empty or run off the end of the address space */
|
|
if (len == 0 || (addr + len - 1) < addr) {
|
|
error_report("tried to set invalid watchpoint at %"
|
|
VADDR_PRIx ", len=%" VADDR_PRIu, addr, len);
|
|
return -EINVAL;
|
|
}
|
|
wp = g_malloc(sizeof(*wp));
|
|
|
|
wp->vaddr = addr;
|
|
wp->len = len;
|
|
wp->flags = flags;
|
|
|
|
/* keep all GDB-injected watchpoints in front */
|
|
if (flags & BP_GDB) {
|
|
QTAILQ_INSERT_HEAD(&cpu->watchpoints, wp, entry);
|
|
} else {
|
|
QTAILQ_INSERT_TAIL(&cpu->watchpoints, wp, entry);
|
|
}
|
|
|
|
tlb_flush_page(cpu, addr);
|
|
|
|
if (watchpoint)
|
|
*watchpoint = wp;
|
|
return 0;
|
|
}
|
|
|
|
/* Remove a specific watchpoint. */
|
|
int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len,
|
|
int flags)
|
|
{
|
|
CPUWatchpoint *wp;
|
|
|
|
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
|
|
if (addr == wp->vaddr && len == wp->len
|
|
&& flags == (wp->flags & ~BP_WATCHPOINT_HIT)) {
|
|
cpu_watchpoint_remove_by_ref(cpu, wp);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* Remove a specific watchpoint by reference. */
|
|
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint)
|
|
{
|
|
QTAILQ_REMOVE(&cpu->watchpoints, watchpoint, entry);
|
|
|
|
tlb_flush_page(cpu, watchpoint->vaddr);
|
|
|
|
g_free(watchpoint);
|
|
}
|
|
|
|
/* Remove all matching watchpoints. */
|
|
void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
|
|
{
|
|
CPUWatchpoint *wp, *next;
|
|
|
|
QTAILQ_FOREACH_SAFE(wp, &cpu->watchpoints, entry, next) {
|
|
if (wp->flags & mask) {
|
|
cpu_watchpoint_remove_by_ref(cpu, wp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return true if this watchpoint address matches the specified
|
|
* access (ie the address range covered by the watchpoint overlaps
|
|
* partially or completely with the address range covered by the
|
|
* access).
|
|
*/
|
|
static inline bool cpu_watchpoint_address_matches(CPUWatchpoint *wp,
|
|
vaddr addr,
|
|
vaddr len)
|
|
{
|
|
/* We know the lengths are non-zero, but a little caution is
|
|
* required to avoid errors in the case where the range ends
|
|
* exactly at the top of the address space and so addr + len
|
|
* wraps round to zero.
|
|
*/
|
|
vaddr wpend = wp->vaddr + wp->len - 1;
|
|
vaddr addrend = addr + len - 1;
|
|
|
|
return !(addr > wpend || wp->vaddr > addrend);
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Add a breakpoint. */
|
|
int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
|
|
CPUBreakpoint **breakpoint)
|
|
{
|
|
CPUBreakpoint *bp;
|
|
|
|
bp = g_malloc(sizeof(*bp));
|
|
|
|
bp->pc = pc;
|
|
bp->flags = flags;
|
|
|
|
/* keep all GDB-injected breakpoints in front */
|
|
if (flags & BP_GDB) {
|
|
QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
|
|
} else {
|
|
QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
|
|
}
|
|
|
|
breakpoint_invalidate(cpu, pc);
|
|
|
|
if (breakpoint) {
|
|
*breakpoint = bp;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Remove a specific breakpoint. */
|
|
int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
|
|
{
|
|
CPUBreakpoint *bp;
|
|
|
|
QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
|
|
if (bp->pc == pc && bp->flags == flags) {
|
|
cpu_breakpoint_remove_by_ref(cpu, bp);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* Remove a specific breakpoint by reference. */
|
|
void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint)
|
|
{
|
|
QTAILQ_REMOVE(&cpu->breakpoints, breakpoint, entry);
|
|
|
|
breakpoint_invalidate(cpu, breakpoint->pc);
|
|
|
|
g_free(breakpoint);
|
|
}
|
|
|
|
/* Remove all matching breakpoints. */
|
|
void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
|
|
{
|
|
CPUBreakpoint *bp, *next;
|
|
|
|
QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
|
|
if (bp->flags & mask) {
|
|
cpu_breakpoint_remove_by_ref(cpu, bp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* enable or disable single step mode. EXCP_DEBUG is returned by the
|
|
CPU loop after each instruction */
|
|
void cpu_single_step(CPUState *cpu, int enabled)
|
|
{
|
|
if (cpu->singlestep_enabled != enabled) {
|
|
cpu->singlestep_enabled = enabled;
|
|
if (kvm_enabled()) {
|
|
kvm_update_guest_debug(cpu, 0);
|
|
} else {
|
|
/* must flush all the translated code to avoid inconsistencies */
|
|
/* XXX: only flush what is necessary */
|
|
tb_flush(cpu);
|
|
}
|
|
}
|
|
}
|
|
|
|
void cpu_abort(CPUState *cpu, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
va_list ap2;
|
|
|
|
va_start(ap, fmt);
|
|
va_copy(ap2, ap);
|
|
fprintf(stderr, "qemu: fatal: ");
|
|
vfprintf(stderr, fmt, ap);
|
|
fprintf(stderr, "\n");
|
|
cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
|
|
if (qemu_log_separate()) {
|
|
qemu_log_lock();
|
|
qemu_log("qemu: fatal: ");
|
|
qemu_log_vprintf(fmt, ap2);
|
|
qemu_log("\n");
|
|
log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
|
|
qemu_log_flush();
|
|
qemu_log_unlock();
|
|
qemu_log_close();
|
|
}
|
|
va_end(ap2);
|
|
va_end(ap);
|
|
replay_finish();
|
|
#if defined(CONFIG_USER_ONLY)
|
|
{
|
|
struct sigaction act;
|
|
sigfillset(&act.sa_mask);
|
|
act.sa_handler = SIG_DFL;
|
|
act.sa_flags = 0;
|
|
sigaction(SIGABRT, &act, NULL);
|
|
}
|
|
#endif
|
|
abort();
|
|
}
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
/* Called from RCU critical section */
|
|
static RAMBlock *qemu_get_ram_block(ram_addr_t addr)
|
|
{
|
|
RAMBlock *block;
|
|
|
|
block = atomic_rcu_read(&ram_list.mru_block);
|
|
if (block && addr - block->offset < block->max_length) {
|
|
return block;
|
|
}
|
|
RAMBLOCK_FOREACH(block) {
|
|
if (addr - block->offset < block->max_length) {
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
|
|
abort();
|
|
|
|
found:
|
|
/* It is safe to write mru_block outside the iothread lock. This
|
|
* is what happens:
|
|
*
|
|
* mru_block = xxx
|
|
* rcu_read_unlock()
|
|
* xxx removed from list
|
|
* rcu_read_lock()
|
|
* read mru_block
|
|
* mru_block = NULL;
|
|
* call_rcu(reclaim_ramblock, xxx);
|
|
* rcu_read_unlock()
|
|
*
|
|
* atomic_rcu_set is not needed here. The block was already published
|
|
* when it was placed into the list. Here we're just making an extra
|
|
* copy of the pointer.
|
|
*/
|
|
ram_list.mru_block = block;
|
|
return block;
|
|
}
|
|
|
|
static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length)
|
|
{
|
|
CPUState *cpu;
|
|
ram_addr_t start1;
|
|
RAMBlock *block;
|
|
ram_addr_t end;
|
|
|
|
assert(tcg_enabled());
|
|
end = TARGET_PAGE_ALIGN(start + length);
|
|
start &= TARGET_PAGE_MASK;
|
|
|
|
rcu_read_lock();
|
|
block = qemu_get_ram_block(start);
|
|
assert(block == qemu_get_ram_block(end - 1));
|
|
start1 = (uintptr_t)ramblock_ptr(block, start - block->offset);
|
|
CPU_FOREACH(cpu) {
|
|
tlb_reset_dirty(cpu, start1, length);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* Note: start and end must be within the same ram block. */
|
|
bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
|
|
ram_addr_t length,
|
|
unsigned client)
|
|
{
|
|
DirtyMemoryBlocks *blocks;
|
|
unsigned long end, page;
|
|
bool dirty = false;
|
|
RAMBlock *ramblock;
|
|
uint64_t mr_offset, mr_size;
|
|
|
|
if (length == 0) {
|
|
return false;
|
|
}
|
|
|
|
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
|
|
page = start >> TARGET_PAGE_BITS;
|
|
|
|
rcu_read_lock();
|
|
|
|
blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
|
|
ramblock = qemu_get_ram_block(start);
|
|
/* Range sanity check on the ramblock */
|
|
assert(start >= ramblock->offset &&
|
|
start + length <= ramblock->offset + ramblock->used_length);
|
|
|
|
while (page < end) {
|
|
unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE;
|
|
unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE;
|
|
unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset);
|
|
|
|
dirty |= bitmap_test_and_clear_atomic(blocks->blocks[idx],
|
|
offset, num);
|
|
page += num;
|
|
}
|
|
|
|
mr_offset = (ram_addr_t)(page << TARGET_PAGE_BITS) - ramblock->offset;
|
|
mr_size = (end - page) << TARGET_PAGE_BITS;
|
|
memory_region_clear_dirty_bitmap(ramblock->mr, mr_offset, mr_size);
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (dirty && tcg_enabled()) {
|
|
tlb_reset_dirty_range_all(start, length);
|
|
}
|
|
|
|
return dirty;
|
|
}
|
|
|
|
DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
|
|
(MemoryRegion *mr, hwaddr offset, hwaddr length, unsigned client)
|
|
{
|
|
DirtyMemoryBlocks *blocks;
|
|
ram_addr_t start = memory_region_get_ram_addr(mr) + offset;
|
|
unsigned long align = 1UL << (TARGET_PAGE_BITS + BITS_PER_LEVEL);
|
|
ram_addr_t first = QEMU_ALIGN_DOWN(start, align);
|
|
ram_addr_t last = QEMU_ALIGN_UP(start + length, align);
|
|
DirtyBitmapSnapshot *snap;
|
|
unsigned long page, end, dest;
|
|
|
|
snap = g_malloc0(sizeof(*snap) +
|
|
((last - first) >> (TARGET_PAGE_BITS + 3)));
|
|
snap->start = first;
|
|
snap->end = last;
|
|
|
|
page = first >> TARGET_PAGE_BITS;
|
|
end = last >> TARGET_PAGE_BITS;
|
|
dest = 0;
|
|
|
|
rcu_read_lock();
|
|
|
|
blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
|
|
|
|
while (page < end) {
|
|
unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE;
|
|
unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE;
|
|
unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset);
|
|
|
|
assert(QEMU_IS_ALIGNED(offset, (1 << BITS_PER_LEVEL)));
|
|
assert(QEMU_IS_ALIGNED(num, (1 << BITS_PER_LEVEL)));
|
|
offset >>= BITS_PER_LEVEL;
|
|
|
|
bitmap_copy_and_clear_atomic(snap->dirty + dest,
|
|
blocks->blocks[idx] + offset,
|
|
num);
|
|
page += num;
|
|
dest += num >> BITS_PER_LEVEL;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (tcg_enabled()) {
|
|
tlb_reset_dirty_range_all(start, length);
|
|
}
|
|
|
|
memory_region_clear_dirty_bitmap(mr, offset, length);
|
|
|
|
return snap;
|
|
}
|
|
|
|
bool cpu_physical_memory_snapshot_get_dirty(DirtyBitmapSnapshot *snap,
|
|
ram_addr_t start,
|
|
ram_addr_t length)
|
|
{
|
|
unsigned long page, end;
|
|
|
|
assert(start >= snap->start);
|
|
assert(start + length <= snap->end);
|
|
|
|
end = TARGET_PAGE_ALIGN(start + length - snap->start) >> TARGET_PAGE_BITS;
|
|
page = (start - snap->start) >> TARGET_PAGE_BITS;
|
|
|
|
while (page < end) {
|
|
if (test_bit(page, snap->dirty)) {
|
|
return true;
|
|
}
|
|
page++;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Called from RCU critical section */
|
|
hwaddr memory_region_section_get_iotlb(CPUState *cpu,
|
|
MemoryRegionSection *section,
|
|
target_ulong vaddr,
|
|
hwaddr paddr, hwaddr xlat,
|
|
int prot,
|
|
target_ulong *address)
|
|
{
|
|
hwaddr iotlb;
|
|
CPUWatchpoint *wp;
|
|
|
|
if (memory_region_is_ram(section->mr)) {
|
|
/* Normal RAM. */
|
|
iotlb = memory_region_get_ram_addr(section->mr) + xlat;
|
|
if (!section->readonly) {
|
|
iotlb |= PHYS_SECTION_NOTDIRTY;
|
|
} else {
|
|
iotlb |= PHYS_SECTION_ROM;
|
|
}
|
|
} else {
|
|
AddressSpaceDispatch *d;
|
|
|
|
d = flatview_to_dispatch(section->fv);
|
|
iotlb = section - d->map.sections;
|
|
iotlb += xlat;
|
|
}
|
|
|
|
/* Make accesses to pages with watchpoints go via the
|
|
watchpoint trap routines. */
|
|
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
|
|
if (cpu_watchpoint_address_matches(wp, vaddr, TARGET_PAGE_SIZE)) {
|
|
/* Avoid trapping reads of pages with a write breakpoint. */
|
|
if ((prot & PAGE_WRITE) || (wp->flags & BP_MEM_READ)) {
|
|
iotlb = PHYS_SECTION_WATCH + paddr;
|
|
*address |= TLB_MMIO;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return iotlb;
|
|
}
|
|
#endif /* defined(CONFIG_USER_ONLY) */
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
|
|
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
|
|
uint16_t section);
|
|
static subpage_t *subpage_init(FlatView *fv, hwaddr base);
|
|
|
|
static void *(*phys_mem_alloc)(size_t size, uint64_t *align, bool shared) =
|
|
qemu_anon_ram_alloc;
|
|
|
|
/*
|
|
* Set a custom physical guest memory alloator.
|
|
* Accelerators with unusual needs may need this. Hopefully, we can
|
|
* get rid of it eventually.
|
|
*/
|
|
void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align, bool shared))
|
|
{
|
|
phys_mem_alloc = alloc;
|
|
}
|
|
|
|
static uint16_t phys_section_add(PhysPageMap *map,
|
|
MemoryRegionSection *section)
|
|
{
|
|
/* The physical section number is ORed with a page-aligned
|
|
* pointer to produce the iotlb entries. Thus it should
|
|
* never overflow into the page-aligned value.
|
|
*/
|
|
assert(map->sections_nb < TARGET_PAGE_SIZE);
|
|
|
|
if (map->sections_nb == map->sections_nb_alloc) {
|
|
map->sections_nb_alloc = MAX(map->sections_nb_alloc * 2, 16);
|
|
map->sections = g_renew(MemoryRegionSection, map->sections,
|
|
map->sections_nb_alloc);
|
|
}
|
|
map->sections[map->sections_nb] = *section;
|
|
memory_region_ref(section->mr);
|
|
return map->sections_nb++;
|
|
}
|
|
|
|
static void phys_section_destroy(MemoryRegion *mr)
|
|
{
|
|
bool have_sub_page = mr->subpage;
|
|
|
|
memory_region_unref(mr);
|
|
|
|
if (have_sub_page) {
|
|
subpage_t *subpage = container_of(mr, subpage_t, iomem);
|
|
object_unref(OBJECT(&subpage->iomem));
|
|
g_free(subpage);
|
|
}
|
|
}
|
|
|
|
static void phys_sections_free(PhysPageMap *map)
|
|
{
|
|
while (map->sections_nb > 0) {
|
|
MemoryRegionSection *section = &map->sections[--map->sections_nb];
|
|
phys_section_destroy(section->mr);
|
|
}
|
|
g_free(map->sections);
|
|
g_free(map->nodes);
|
|
}
|
|
|
|
static void register_subpage(FlatView *fv, MemoryRegionSection *section)
|
|
{
|
|
AddressSpaceDispatch *d = flatview_to_dispatch(fv);
|
|
subpage_t *subpage;
|
|
hwaddr base = section->offset_within_address_space
|
|
& TARGET_PAGE_MASK;
|
|
MemoryRegionSection *existing = phys_page_find(d, base);
|
|
MemoryRegionSection subsection = {
|
|
.offset_within_address_space = base,
|
|
.size = int128_make64(TARGET_PAGE_SIZE),
|
|
};
|
|
hwaddr start, end;
|
|
|
|
assert(existing->mr->subpage || existing->mr == &io_mem_unassigned);
|
|
|
|
if (!(existing->mr->subpage)) {
|
|
subpage = subpage_init(fv, base);
|
|
subsection.fv = fv;
|
|
subsection.mr = &subpage->iomem;
|
|
phys_page_set(d, base >> TARGET_PAGE_BITS, 1,
|
|
phys_section_add(&d->map, &subsection));
|
|
} else {
|
|
subpage = container_of(existing->mr, subpage_t, iomem);
|
|
}
|
|
start = section->offset_within_address_space & ~TARGET_PAGE_MASK;
|
|
end = start + int128_get64(section->size) - 1;
|
|
subpage_register(subpage, start, end,
|
|
phys_section_add(&d->map, section));
|
|
}
|
|
|
|
|
|
static void register_multipage(FlatView *fv,
|
|
MemoryRegionSection *section)
|
|
{
|
|
AddressSpaceDispatch *d = flatview_to_dispatch(fv);
|
|
hwaddr start_addr = section->offset_within_address_space;
|
|
uint16_t section_index = phys_section_add(&d->map, section);
|
|
uint64_t num_pages = int128_get64(int128_rshift(section->size,
|
|
TARGET_PAGE_BITS));
|
|
|
|
assert(num_pages);
|
|
phys_page_set(d, start_addr >> TARGET_PAGE_BITS, num_pages, section_index);
|
|
}
|
|
|
|
/*
|
|
* The range in *section* may look like this:
|
|
*
|
|
* |s|PPPPPPP|s|
|
|
*
|
|
* where s stands for subpage and P for page.
|
|
*/
|
|
void flatview_add_to_dispatch(FlatView *fv, MemoryRegionSection *section)
|
|
{
|
|
MemoryRegionSection remain = *section;
|
|
Int128 page_size = int128_make64(TARGET_PAGE_SIZE);
|
|
|
|
/* register first subpage */
|
|
if (remain.offset_within_address_space & ~TARGET_PAGE_MASK) {
|
|
uint64_t left = TARGET_PAGE_ALIGN(remain.offset_within_address_space)
|
|
- remain.offset_within_address_space;
|
|
|
|
MemoryRegionSection now = remain;
|
|
now.size = int128_min(int128_make64(left), now.size);
|
|
register_subpage(fv, &now);
|
|
if (int128_eq(remain.size, now.size)) {
|
|
return;
|
|
}
|
|
remain.size = int128_sub(remain.size, now.size);
|
|
remain.offset_within_address_space += int128_get64(now.size);
|
|
remain.offset_within_region += int128_get64(now.size);
|
|
}
|
|
|
|
/* register whole pages */
|
|
if (int128_ge(remain.size, page_size)) {
|
|
MemoryRegionSection now = remain;
|
|
now.size = int128_and(now.size, int128_neg(page_size));
|
|
register_multipage(fv, &now);
|
|
if (int128_eq(remain.size, now.size)) {
|
|
return;
|
|
}
|
|
remain.size = int128_sub(remain.size, now.size);
|
|
remain.offset_within_address_space += int128_get64(now.size);
|
|
remain.offset_within_region += int128_get64(now.size);
|
|
}
|
|
|
|
/* register last subpage */
|
|
register_subpage(fv, &remain);
|
|
}
|
|
|
|
void qemu_flush_coalesced_mmio_buffer(void)
|
|
{
|
|
if (kvm_enabled())
|
|
kvm_flush_coalesced_mmio_buffer();
|
|
}
|
|
|
|
void qemu_mutex_lock_ramlist(void)
|
|
{
|
|
qemu_mutex_lock(&ram_list.mutex);
|
|
}
|
|
|
|
void qemu_mutex_unlock_ramlist(void)
|
|
{
|
|
qemu_mutex_unlock(&ram_list.mutex);
|
|
}
|
|
|
|
void ram_block_dump(Monitor *mon)
|
|
{
|
|
RAMBlock *block;
|
|
char *psize;
|
|
|
|
rcu_read_lock();
|
|
monitor_printf(mon, "%24s %8s %18s %18s %18s\n",
|
|
"Block Name", "PSize", "Offset", "Used", "Total");
|
|
RAMBLOCK_FOREACH(block) {
|
|
psize = size_to_str(block->page_size);
|
|
monitor_printf(mon, "%24s %8s 0x%016" PRIx64 " 0x%016" PRIx64
|
|
" 0x%016" PRIx64 "\n", block->idstr, psize,
|
|
(uint64_t)block->offset,
|
|
(uint64_t)block->used_length,
|
|
(uint64_t)block->max_length);
|
|
g_free(psize);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
#ifdef __linux__
|
|
/*
|
|
* FIXME TOCTTOU: this iterates over memory backends' mem-path, which
|
|
* may or may not name the same files / on the same filesystem now as
|
|
* when we actually open and map them. Iterate over the file
|
|
* descriptors instead, and use qemu_fd_getpagesize().
|
|
*/
|
|
static int find_min_backend_pagesize(Object *obj, void *opaque)
|
|
{
|
|
long *hpsize_min = opaque;
|
|
|
|
if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
long hpsize = host_memory_backend_pagesize(backend);
|
|
|
|
if (host_memory_backend_is_mapped(backend) && (hpsize < *hpsize_min)) {
|
|
*hpsize_min = hpsize;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int find_max_backend_pagesize(Object *obj, void *opaque)
|
|
{
|
|
long *hpsize_max = opaque;
|
|
|
|
if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
long hpsize = host_memory_backend_pagesize(backend);
|
|
|
|
if (host_memory_backend_is_mapped(backend) && (hpsize > *hpsize_max)) {
|
|
*hpsize_max = hpsize;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* TODO: We assume right now that all mapped host memory backends are
|
|
* used as RAM, however some might be used for different purposes.
|
|
*/
|
|
long qemu_minrampagesize(void)
|
|
{
|
|
long hpsize = LONG_MAX;
|
|
long mainrampagesize;
|
|
Object *memdev_root;
|
|
|
|
mainrampagesize = qemu_mempath_getpagesize(mem_path);
|
|
|
|
/* it's possible we have memory-backend objects with
|
|
* hugepage-backed RAM. these may get mapped into system
|
|
* address space via -numa parameters or memory hotplug
|
|
* hooks. we want to take these into account, but we
|
|
* also want to make sure these supported hugepage
|
|
* sizes are applicable across the entire range of memory
|
|
* we may boot from, so we take the min across all
|
|
* backends, and assume normal pages in cases where a
|
|
* backend isn't backed by hugepages.
|
|
*/
|
|
memdev_root = object_resolve_path("/objects", NULL);
|
|
if (memdev_root) {
|
|
object_child_foreach(memdev_root, find_min_backend_pagesize, &hpsize);
|
|
}
|
|
if (hpsize == LONG_MAX) {
|
|
/* No additional memory regions found ==> Report main RAM page size */
|
|
return mainrampagesize;
|
|
}
|
|
|
|
/* If NUMA is disabled or the NUMA nodes are not backed with a
|
|
* memory-backend, then there is at least one node using "normal" RAM,
|
|
* so if its page size is smaller we have got to report that size instead.
|
|
*/
|
|
if (hpsize > mainrampagesize &&
|
|
(nb_numa_nodes == 0 || numa_info[0].node_memdev == NULL)) {
|
|
static bool warned;
|
|
if (!warned) {
|
|
error_report("Huge page support disabled (n/a for main memory).");
|
|
warned = true;
|
|
}
|
|
return mainrampagesize;
|
|
}
|
|
|
|
return hpsize;
|
|
}
|
|
|
|
long qemu_maxrampagesize(void)
|
|
{
|
|
long pagesize = qemu_mempath_getpagesize(mem_path);
|
|
Object *memdev_root = object_resolve_path("/objects", NULL);
|
|
|
|
if (memdev_root) {
|
|
object_child_foreach(memdev_root, find_max_backend_pagesize,
|
|
&pagesize);
|
|
}
|
|
return pagesize;
|
|
}
|
|
#else
|
|
long qemu_minrampagesize(void)
|
|
{
|
|
return getpagesize();
|
|
}
|
|
long qemu_maxrampagesize(void)
|
|
{
|
|
return getpagesize();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_POSIX
|
|
static int64_t get_file_size(int fd)
|
|
{
|
|
int64_t size = lseek(fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
static int file_ram_open(const char *path,
|
|
const char *region_name,
|
|
bool *created,
|
|
Error **errp)
|
|
{
|
|
char *filename;
|
|
char *sanitized_name;
|
|
char *c;
|
|
int fd = -1;
|
|
|
|
*created = false;
|
|
for (;;) {
|
|
fd = open(path, O_RDWR);
|
|
if (fd >= 0) {
|
|
/* @path names an existing file, use it */
|
|
break;
|
|
}
|
|
if (errno == ENOENT) {
|
|
/* @path names a file that doesn't exist, create it */
|
|
fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0644);
|
|
if (fd >= 0) {
|
|
*created = true;
|
|
break;
|
|
}
|
|
} else if (errno == EISDIR) {
|
|
/* @path names a directory, create a file there */
|
|
/* Make name safe to use with mkstemp by replacing '/' with '_'. */
|
|
sanitized_name = g_strdup(region_name);
|
|
for (c = sanitized_name; *c != '\0'; c++) {
|
|
if (*c == '/') {
|
|
*c = '_';
|
|
}
|
|
}
|
|
|
|
filename = g_strdup_printf("%s/qemu_back_mem.%s.XXXXXX", path,
|
|
sanitized_name);
|
|
g_free(sanitized_name);
|
|
|
|
fd = mkstemp(filename);
|
|
if (fd >= 0) {
|
|
unlink(filename);
|
|
g_free(filename);
|
|
break;
|
|
}
|
|
g_free(filename);
|
|
}
|
|
if (errno != EEXIST && errno != EINTR) {
|
|
error_setg_errno(errp, errno,
|
|
"can't open backing store %s for guest RAM",
|
|
path);
|
|
return -1;
|
|
}
|
|
/*
|
|
* Try again on EINTR and EEXIST. The latter happens when
|
|
* something else creates the file between our two open().
|
|
*/
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
static void *file_ram_alloc(RAMBlock *block,
|
|
ram_addr_t memory,
|
|
int fd,
|
|
bool truncate,
|
|
Error **errp)
|
|
{
|
|
MachineState *ms = MACHINE(qdev_get_machine());
|
|
void *area;
|
|
|
|
block->page_size = qemu_fd_getpagesize(fd);
|
|
if (block->mr->align % block->page_size) {
|
|
error_setg(errp, "alignment 0x%" PRIx64
|
|
" must be multiples of page size 0x%zx",
|
|
block->mr->align, block->page_size);
|
|
return NULL;
|
|
} else if (block->mr->align && !is_power_of_2(block->mr->align)) {
|
|
error_setg(errp, "alignment 0x%" PRIx64
|
|
" must be a power of two", block->mr->align);
|
|
return NULL;
|
|
}
|
|
block->mr->align = MAX(block->page_size, block->mr->align);
|
|
#if defined(__s390x__)
|
|
if (kvm_enabled()) {
|
|
block->mr->align = MAX(block->mr->align, QEMU_VMALLOC_ALIGN);
|
|
}
|
|
#endif
|
|
|
|
if (memory < block->page_size) {
|
|
error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
|
|
"or larger than page size 0x%zx",
|
|
memory, block->page_size);
|
|
return NULL;
|
|
}
|
|
|
|
memory = ROUND_UP(memory, block->page_size);
|
|
|
|
/*
|
|
* ftruncate is not supported by hugetlbfs in older
|
|
* hosts, so don't bother bailing out on errors.
|
|
* If anything goes wrong with it under other filesystems,
|
|
* mmap will fail.
|
|
*
|
|
* Do not truncate the non-empty backend file to avoid corrupting
|
|
* the existing data in the file. Disabling shrinking is not
|
|
* enough. For example, the current vNVDIMM implementation stores
|
|
* the guest NVDIMM labels at the end of the backend file. If the
|
|
* backend file is later extended, QEMU will not be able to find
|
|
* those labels. Therefore, extending the non-empty backend file
|
|
* is disabled as well.
|
|
*/
|
|
if (truncate && ftruncate(fd, memory)) {
|
|
perror("ftruncate");
|
|
}
|
|
|
|
area = qemu_ram_mmap(fd, memory, block->mr->align,
|
|
block->flags & RAM_SHARED, block->flags & RAM_PMEM);
|
|
if (area == MAP_FAILED) {
|
|
error_setg_errno(errp, errno,
|
|
"unable to map backing store for guest RAM");
|
|
return NULL;
|
|
}
|
|
|
|
if (mem_prealloc) {
|
|
os_mem_prealloc(fd, area, memory, ms->smp.cpus, errp);
|
|
if (errp && *errp) {
|
|
qemu_ram_munmap(fd, area, memory);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
block->fd = fd;
|
|
return area;
|
|
}
|
|
#endif
|
|
|
|
/* Allocate space within the ram_addr_t space that governs the
|
|
* dirty bitmaps.
|
|
* Called with the ramlist lock held.
|
|
*/
|
|
static ram_addr_t find_ram_offset(ram_addr_t size)
|
|
{
|
|
RAMBlock *block, *next_block;
|
|
ram_addr_t offset = RAM_ADDR_MAX, mingap = RAM_ADDR_MAX;
|
|
|
|
assert(size != 0); /* it would hand out same offset multiple times */
|
|
|
|
if (QLIST_EMPTY_RCU(&ram_list.blocks)) {
|
|
return 0;
|
|
}
|
|
|
|
RAMBLOCK_FOREACH(block) {
|
|
ram_addr_t candidate, next = RAM_ADDR_MAX;
|
|
|
|
/* Align blocks to start on a 'long' in the bitmap
|
|
* which makes the bitmap sync'ing take the fast path.
|
|
*/
|
|
candidate = block->offset + block->max_length;
|
|
candidate = ROUND_UP(candidate, BITS_PER_LONG << TARGET_PAGE_BITS);
|
|
|
|
/* Search for the closest following block
|
|
* and find the gap.
|
|
*/
|
|
RAMBLOCK_FOREACH(next_block) {
|
|
if (next_block->offset >= candidate) {
|
|
next = MIN(next, next_block->offset);
|
|
}
|
|
}
|
|
|
|
/* If it fits remember our place and remember the size
|
|
* of gap, but keep going so that we might find a smaller
|
|
* gap to fill so avoiding fragmentation.
|
|
*/
|
|
if (next - candidate >= size && next - candidate < mingap) {
|
|
offset = candidate;
|
|
mingap = next - candidate;
|
|
}
|
|
|
|
trace_find_ram_offset_loop(size, candidate, offset, next, mingap);
|
|
}
|
|
|
|
if (offset == RAM_ADDR_MAX) {
|
|
fprintf(stderr, "Failed to find gap of requested size: %" PRIu64 "\n",
|
|
(uint64_t)size);
|
|
abort();
|
|
}
|
|
|
|
trace_find_ram_offset(size, offset);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static unsigned long last_ram_page(void)
|
|
{
|
|
RAMBlock *block;
|
|
ram_addr_t last = 0;
|
|
|
|
rcu_read_lock();
|
|
RAMBLOCK_FOREACH(block) {
|
|
last = MAX(last, block->offset + block->max_length);
|
|
}
|
|
rcu_read_unlock();
|
|
return last >> TARGET_PAGE_BITS;
|
|
}
|
|
|
|
static void qemu_ram_setup_dump(void *addr, ram_addr_t size)
|
|
{
|
|
int ret;
|
|
|
|
/* Use MADV_DONTDUMP, if user doesn't want the guest memory in the core */
|
|
if (!machine_dump_guest_core(current_machine)) {
|
|
ret = qemu_madvise(addr, size, QEMU_MADV_DONTDUMP);
|
|
if (ret) {
|
|
perror("qemu_madvise");
|
|
fprintf(stderr, "madvise doesn't support MADV_DONTDUMP, "
|
|
"but dump_guest_core=off specified\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
const char *qemu_ram_get_idstr(RAMBlock *rb)
|
|
{
|
|
return rb->idstr;
|
|
}
|
|
|
|
void *qemu_ram_get_host_addr(RAMBlock *rb)
|
|
{
|
|
return rb->host;
|
|
}
|
|
|
|
ram_addr_t qemu_ram_get_offset(RAMBlock *rb)
|
|
{
|
|
return rb->offset;
|
|
}
|
|
|
|
ram_addr_t qemu_ram_get_used_length(RAMBlock *rb)
|
|
{
|
|
return rb->used_length;
|
|
}
|
|
|
|
bool qemu_ram_is_shared(RAMBlock *rb)
|
|
{
|
|
return rb->flags & RAM_SHARED;
|
|
}
|
|
|
|
/* Note: Only set at the start of postcopy */
|
|
bool qemu_ram_is_uf_zeroable(RAMBlock *rb)
|
|
{
|
|
return rb->flags & RAM_UF_ZEROPAGE;
|
|
}
|
|
|
|
void qemu_ram_set_uf_zeroable(RAMBlock *rb)
|
|
{
|
|
rb->flags |= RAM_UF_ZEROPAGE;
|
|
}
|
|
|
|
bool qemu_ram_is_migratable(RAMBlock *rb)
|
|
{
|
|
return rb->flags & RAM_MIGRATABLE;
|
|
}
|
|
|
|
void qemu_ram_set_migratable(RAMBlock *rb)
|
|
{
|
|
rb->flags |= RAM_MIGRATABLE;
|
|
}
|
|
|
|
void qemu_ram_unset_migratable(RAMBlock *rb)
|
|
{
|
|
rb->flags &= ~RAM_MIGRATABLE;
|
|
}
|
|
|
|
/* Called with iothread lock held. */
|
|
void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev)
|
|
{
|
|
RAMBlock *block;
|
|
|
|
assert(new_block);
|
|
assert(!new_block->idstr[0]);
|
|
|
|
if (dev) {
|
|
char *id = qdev_get_dev_path(dev);
|
|
if (id) {
|
|
snprintf(new_block->idstr, sizeof(new_block->idstr), "%s/", id);
|
|
g_free(id);
|
|
}
|
|
}
|
|
pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
|
|
|
|
rcu_read_lock();
|
|
RAMBLOCK_FOREACH(block) {
|
|
if (block != new_block &&
|
|
!strcmp(block->idstr, new_block->idstr)) {
|
|
fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
|
|
new_block->idstr);
|
|
abort();
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* Called with iothread lock held. */
|
|
void qemu_ram_unset_idstr(RAMBlock *block)
|
|
{
|
|
/* FIXME: arch_init.c assumes that this is not called throughout
|
|
* migration. Ignore the problem since hot-unplug during migration
|
|
* does not work anyway.
|
|
*/
|
|
if (block) {
|
|
memset(block->idstr, 0, sizeof(block->idstr));
|
|
}
|
|
}
|
|
|
|
size_t qemu_ram_pagesize(RAMBlock *rb)
|
|
{
|
|
return rb->page_size;
|
|
}
|
|
|
|
/* Returns the largest size of page in use */
|
|
size_t qemu_ram_pagesize_largest(void)
|
|
{
|
|
RAMBlock *block;
|
|
size_t largest = 0;
|
|
|
|
RAMBLOCK_FOREACH(block) {
|
|
largest = MAX(largest, qemu_ram_pagesize(block));
|
|
}
|
|
|
|
return largest;
|
|
}
|
|
|
|
static int memory_try_enable_merging(void *addr, size_t len)
|
|
{
|
|
if (!machine_mem_merge(current_machine)) {
|
|
/* disabled by the user */
|
|
return 0;
|
|
}
|
|
|
|
return qemu_madvise(addr, len, QEMU_MADV_MERGEABLE);
|
|
}
|
|
|
|
/* Only legal before guest might have detected the memory size: e.g. on
|
|
* incoming migration, or right after reset.
|
|
*
|
|
* As memory core doesn't know how is memory accessed, it is up to
|
|
* resize callback to update device state and/or add assertions to detect
|
|
* misuse, if necessary.
|
|
*/
|
|
int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp)
|
|
{
|
|
assert(block);
|
|
|
|
newsize = HOST_PAGE_ALIGN(newsize);
|
|
|
|
if (block->used_length == newsize) {
|
|
return 0;
|
|
}
|
|
|
|
if (!(block->flags & RAM_RESIZEABLE)) {
|
|
error_setg_errno(errp, EINVAL,
|
|
"Length mismatch: %s: 0x" RAM_ADDR_FMT
|
|
" in != 0x" RAM_ADDR_FMT, block->idstr,
|
|
newsize, block->used_length);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (block->max_length < newsize) {
|
|
error_setg_errno(errp, EINVAL,
|
|
"Length too large: %s: 0x" RAM_ADDR_FMT
|
|
" > 0x" RAM_ADDR_FMT, block->idstr,
|
|
newsize, block->max_length);
|
|
return -EINVAL;
|
|
}
|
|
|
|
cpu_physical_memory_clear_dirty_range(block->offset, block->used_length);
|
|
block->used_length = newsize;
|
|
cpu_physical_memory_set_dirty_range(block->offset, block->used_length,
|
|
DIRTY_CLIENTS_ALL);
|
|
memory_region_set_size(block->mr, newsize);
|
|
if (block->resized) {
|
|
block->resized(block->idstr, newsize, block->host);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Called with ram_list.mutex held */
|
|
static void dirty_memory_extend(ram_addr_t old_ram_size,
|
|
ram_addr_t new_ram_size)
|
|
{
|
|
ram_addr_t old_num_blocks = DIV_ROUND_UP(old_ram_size,
|
|
DIRTY_MEMORY_BLOCK_SIZE);
|
|
ram_addr_t new_num_blocks = DIV_ROUND_UP(new_ram_size,
|
|
DIRTY_MEMORY_BLOCK_SIZE);
|
|
int i;
|
|
|
|
/* Only need to extend if block count increased */
|
|
if (new_num_blocks <= old_num_blocks) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
|
|
DirtyMemoryBlocks *old_blocks;
|
|
DirtyMemoryBlocks *new_blocks;
|
|
int j;
|
|
|
|
old_blocks = atomic_rcu_read(&ram_list.dirty_memory[i]);
|
|
new_blocks = g_malloc(sizeof(*new_blocks) +
|
|
sizeof(new_blocks->blocks[0]) * new_num_blocks);
|
|
|
|
if (old_num_blocks) {
|
|
memcpy(new_blocks->blocks, old_blocks->blocks,
|
|
old_num_blocks * sizeof(old_blocks->blocks[0]));
|
|
}
|
|
|
|
for (j = old_num_blocks; j < new_num_blocks; j++) {
|
|
new_blocks->blocks[j] = bitmap_new(DIRTY_MEMORY_BLOCK_SIZE);
|
|
}
|
|
|
|
atomic_rcu_set(&ram_list.dirty_memory[i], new_blocks);
|
|
|
|
if (old_blocks) {
|
|
g_free_rcu(old_blocks, rcu);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
|
|
{
|
|
RAMBlock *block;
|
|
RAMBlock *last_block = NULL;
|
|
ram_addr_t old_ram_size, new_ram_size;
|
|
Error *err = NULL;
|
|
|
|
old_ram_size = last_ram_page();
|
|
|
|
qemu_mutex_lock_ramlist();
|
|
new_block->offset = find_ram_offset(new_block->max_length);
|
|
|
|
if (!new_block->host) {
|
|
if (xen_enabled()) {
|
|
xen_ram_alloc(new_block->offset, new_block->max_length,
|
|
new_block->mr, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
qemu_mutex_unlock_ramlist();
|
|
return;
|
|
}
|
|
} else {
|
|
new_block->host = phys_mem_alloc(new_block->max_length,
|
|
&new_block->mr->align, shared);
|
|
if (!new_block->host) {
|
|
error_setg_errno(errp, errno,
|
|
"cannot set up guest memory '%s'",
|
|
memory_region_name(new_block->mr));
|
|
qemu_mutex_unlock_ramlist();
|
|
return;
|
|
}
|
|
memory_try_enable_merging(new_block->host, new_block->max_length);
|
|
}
|
|
}
|
|
|
|
new_ram_size = MAX(old_ram_size,
|
|
(new_block->offset + new_block->max_length) >> TARGET_PAGE_BITS);
|
|
if (new_ram_size > old_ram_size) {
|
|
dirty_memory_extend(old_ram_size, new_ram_size);
|
|
}
|
|
/* Keep the list sorted from biggest to smallest block. Unlike QTAILQ,
|
|
* QLIST (which has an RCU-friendly variant) does not have insertion at
|
|
* tail, so save the last element in last_block.
|
|
*/
|
|
RAMBLOCK_FOREACH(block) {
|
|
last_block = block;
|
|
if (block->max_length < new_block->max_length) {
|
|
break;
|
|
}
|
|
}
|
|
if (block) {
|
|
QLIST_INSERT_BEFORE_RCU(block, new_block, next);
|
|
} else if (last_block) {
|
|
QLIST_INSERT_AFTER_RCU(last_block, new_block, next);
|
|
} else { /* list is empty */
|
|
QLIST_INSERT_HEAD_RCU(&ram_list.blocks, new_block, next);
|
|
}
|
|
ram_list.mru_block = NULL;
|
|
|
|
/* Write list before version */
|
|
smp_wmb();
|
|
ram_list.version++;
|
|
qemu_mutex_unlock_ramlist();
|
|
|
|
cpu_physical_memory_set_dirty_range(new_block->offset,
|
|
new_block->used_length,
|
|
DIRTY_CLIENTS_ALL);
|
|
|
|
if (new_block->host) {
|
|
qemu_ram_setup_dump(new_block->host, new_block->max_length);
|
|
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE);
|
|
/* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */
|
|
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DONTFORK);
|
|
ram_block_notify_add(new_block->host, new_block->max_length);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_POSIX
|
|
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
|
|
uint32_t ram_flags, int fd,
|
|
Error **errp)
|
|
{
|
|
RAMBlock *new_block;
|
|
Error *local_err = NULL;
|
|
int64_t file_size;
|
|
|
|
/* Just support these ram flags by now. */
|
|
assert((ram_flags & ~(RAM_SHARED | RAM_PMEM)) == 0);
|
|
|
|
if (xen_enabled()) {
|
|
error_setg(errp, "-mem-path not supported with Xen");
|
|
return NULL;
|
|
}
|
|
|
|
if (kvm_enabled() && !kvm_has_sync_mmu()) {
|
|
error_setg(errp,
|
|
"host lacks kvm mmu notifiers, -mem-path unsupported");
|
|
return NULL;
|
|
}
|
|
|
|
if (phys_mem_alloc != qemu_anon_ram_alloc) {
|
|
/*
|
|
* file_ram_alloc() needs to allocate just like
|
|
* phys_mem_alloc, but we haven't bothered to provide
|
|
* a hook there.
|
|
*/
|
|
error_setg(errp,
|
|
"-mem-path not supported with this accelerator");
|
|
return NULL;
|
|
}
|
|
|
|
size = HOST_PAGE_ALIGN(size);
|
|
file_size = get_file_size(fd);
|
|
if (file_size > 0 && file_size < size) {
|
|
error_setg(errp, "backing store %s size 0x%" PRIx64
|
|
" does not match 'size' option 0x" RAM_ADDR_FMT,
|
|
mem_path, file_size, size);
|
|
return NULL;
|
|
}
|
|
|
|
new_block = g_malloc0(sizeof(*new_block));
|
|
new_block->mr = mr;
|
|
new_block->used_length = size;
|
|
new_block->max_length = size;
|
|
new_block->flags = ram_flags;
|
|
new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
|
|
if (!new_block->host) {
|
|
g_free(new_block);
|
|
return NULL;
|
|
}
|
|
|
|
ram_block_add(new_block, &local_err, ram_flags & RAM_SHARED);
|
|
if (local_err) {
|
|
g_free(new_block);
|
|
error_propagate(errp, local_err);
|
|
return NULL;
|
|
}
|
|
return new_block;
|
|
|
|
}
|
|
|
|
|
|
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
|
|
uint32_t ram_flags, const char *mem_path,
|
|
Error **errp)
|
|
{
|
|
int fd;
|
|
bool created;
|
|
RAMBlock *block;
|
|
|
|
fd = file_ram_open(mem_path, memory_region_name(mr), &created, errp);
|
|
if (fd < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp);
|
|
if (!block) {
|
|
if (created) {
|
|
unlink(mem_path);
|
|
}
|
|
close(fd);
|
|
return NULL;
|
|
}
|
|
|
|
return block;
|
|
}
|
|
#endif
|
|
|
|
static
|
|
RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size,
|
|
void (*resized)(const char*,
|
|
uint64_t length,
|
|
void *host),
|
|
void *host, bool resizeable, bool share,
|
|
MemoryRegion *mr, Error **errp)
|
|
{
|
|
RAMBlock *new_block;
|
|
Error *local_err = NULL;
|
|
|
|
size = HOST_PAGE_ALIGN(size);
|
|
max_size = HOST_PAGE_ALIGN(max_size);
|
|
new_block = g_malloc0(sizeof(*new_block));
|
|
new_block->mr = mr;
|
|
new_block->resized = resized;
|
|
new_block->used_length = size;
|
|
new_block->max_length = max_size;
|
|
assert(max_size >= size);
|
|
new_block->fd = -1;
|
|
new_block->page_size = getpagesize();
|
|
new_block->host = host;
|
|
if (host) {
|
|
new_block->flags |= RAM_PREALLOC;
|
|
}
|
|
if (resizeable) {
|
|
new_block->flags |= RAM_RESIZEABLE;
|
|
}
|
|
ram_block_add(new_block, &local_err, share);
|
|
if (local_err) {
|
|
g_free(new_block);
|
|
error_propagate(errp, local_err);
|
|
return NULL;
|
|
}
|
|
return new_block;
|
|
}
|
|
|
|
RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
|
|
MemoryRegion *mr, Error **errp)
|
|
{
|
|
return qemu_ram_alloc_internal(size, size, NULL, host, false,
|
|
false, mr, errp);
|
|
}
|
|
|
|
RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share,
|
|
MemoryRegion *mr, Error **errp)
|
|
{
|
|
return qemu_ram_alloc_internal(size, size, NULL, NULL, false,
|
|
share, mr, errp);
|
|
}
|
|
|
|
RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t maxsz,
|
|
void (*resized)(const char*,
|
|
uint64_t length,
|
|
void *host),
|
|
MemoryRegion *mr, Error **errp)
|
|
{
|
|
return qemu_ram_alloc_internal(size, maxsz, resized, NULL, true,
|
|
false, mr, errp);
|
|
}
|
|
|
|
static void reclaim_ramblock(RAMBlock *block)
|
|
{
|
|
if (block->flags & RAM_PREALLOC) {
|
|
;
|
|
} else if (xen_enabled()) {
|
|
xen_invalidate_map_cache_entry(block->host);
|
|
#ifndef _WIN32
|
|
} else if (block->fd >= 0) {
|
|
qemu_ram_munmap(block->fd, block->host, block->max_length);
|
|
close(block->fd);
|
|
#endif
|
|
} else {
|
|
qemu_anon_ram_free(block->host, block->max_length);
|
|
}
|
|
g_free(block);
|
|
}
|
|
|
|
void qemu_ram_free(RAMBlock *block)
|
|
{
|
|
if (!block) {
|
|
return;
|
|
}
|
|
|
|
if (block->host) {
|
|
ram_block_notify_remove(block->host, block->max_length);
|
|
}
|
|
|
|
qemu_mutex_lock_ramlist();
|
|
QLIST_REMOVE_RCU(block, next);
|
|
ram_list.mru_block = NULL;
|
|
/* Write list before version */
|
|
smp_wmb();
|
|
ram_list.version++;
|
|
call_rcu(block, reclaim_ramblock, rcu);
|
|
qemu_mutex_unlock_ramlist();
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
|
|
{
|
|
RAMBlock *block;
|
|
ram_addr_t offset;
|
|
int flags;
|
|
void *area, *vaddr;
|
|
|
|
RAMBLOCK_FOREACH(block) {
|
|
offset = addr - block->offset;
|
|
if (offset < block->max_length) {
|
|
vaddr = ramblock_ptr(block, offset);
|
|
if (block->flags & RAM_PREALLOC) {
|
|
;
|
|
} else if (xen_enabled()) {
|
|
abort();
|
|
} else {
|
|
flags = MAP_FIXED;
|
|
if (block->fd >= 0) {
|
|
flags |= (block->flags & RAM_SHARED ?
|
|
MAP_SHARED : MAP_PRIVATE);
|
|
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
|
|
flags, block->fd, offset);
|
|
} else {
|
|
/*
|
|
* Remap needs to match alloc. Accelerators that
|
|
* set phys_mem_alloc never remap. If they did,
|
|
* we'd need a remap hook here.
|
|
*/
|
|
assert(phys_mem_alloc == qemu_anon_ram_alloc);
|
|
|
|
flags |= MAP_PRIVATE | MAP_ANONYMOUS;
|
|
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
|
|
flags, -1, 0);
|
|
}
|
|
if (area != vaddr) {
|
|
error_report("Could not remap addr: "
|
|
RAM_ADDR_FMT "@" RAM_ADDR_FMT "",
|
|
length, addr);
|
|
exit(1);
|
|
}
|
|
memory_try_enable_merging(vaddr, length);
|
|
qemu_ram_setup_dump(vaddr, length);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif /* !_WIN32 */
|
|
|
|
/* Return a host pointer to ram allocated with qemu_ram_alloc.
|
|
* This should not be used for general purpose DMA. Use address_space_map
|
|
* or address_space_rw instead. For local memory (e.g. video ram) that the
|
|
* device owns, use memory_region_get_ram_ptr.
|
|
*
|
|
* Called within RCU critical section.
|
|
*/
|
|
void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
|
|
{
|
|
RAMBlock *block = ram_block;
|
|
|
|
if (block == NULL) {
|
|
block = qemu_get_ram_block(addr);
|
|
addr -= block->offset;
|
|
}
|
|
|
|
if (xen_enabled() && block->host == NULL) {
|
|
/* We need to check if the requested address is in the RAM
|
|
* because we don't want to map the entire memory in QEMU.
|
|
* In that case just map until the end of the page.
|
|
*/
|
|
if (block->offset == 0) {
|
|
return xen_map_cache(addr, 0, 0, false);
|
|
}
|
|
|
|
block->host = xen_map_cache(block->offset, block->max_length, 1, false);
|
|
}
|
|
return ramblock_ptr(block, addr);
|
|
}
|
|
|
|
/* Return a host pointer to guest's ram. Similar to qemu_map_ram_ptr
|
|
* but takes a size argument.
|
|
*
|
|
* Called within RCU critical section.
|
|
*/
|
|
static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr,
|
|
hwaddr *size, bool lock)
|
|
{
|
|
RAMBlock *block = ram_block;
|
|
if (*size == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (block == NULL) {
|
|
block = qemu_get_ram_block(addr);
|
|
addr -= block->offset;
|
|
}
|
|
*size = MIN(*size, block->max_length - addr);
|
|
|
|
if (xen_enabled() && block->host == NULL) {
|
|
/* We need to check if the requested address is in the RAM
|
|
* because we don't want to map the entire memory in QEMU.
|
|
* In that case just map the requested area.
|
|
*/
|
|
if (block->offset == 0) {
|
|
return xen_map_cache(addr, *size, lock, lock);
|
|
}
|
|
|
|
block->host = xen_map_cache(block->offset, block->max_length, 1, lock);
|
|
}
|
|
|
|
return ramblock_ptr(block, addr);
|
|
}
|
|
|
|
/* Return the offset of a hostpointer within a ramblock */
|
|
ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host)
|
|
{
|
|
ram_addr_t res = (uint8_t *)host - (uint8_t *)rb->host;
|
|
assert((uintptr_t)host >= (uintptr_t)rb->host);
|
|
assert(res < rb->max_length);
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Translates a host ptr back to a RAMBlock, a ram_addr and an offset
|
|
* in that RAMBlock.
|
|
*
|
|
* ptr: Host pointer to look up
|
|
* round_offset: If true round the result offset down to a page boundary
|
|
* *ram_addr: set to result ram_addr
|
|
* *offset: set to result offset within the RAMBlock
|
|
*
|
|
* Returns: RAMBlock (or NULL if not found)
|
|
*
|
|
* By the time this function returns, the returned pointer is not protected
|
|
* by RCU anymore. If the caller is not within an RCU critical section and
|
|
* does not hold the iothread lock, it must have other means of protecting the
|
|
* pointer, such as a reference to the region that includes the incoming
|
|
* ram_addr_t.
|
|
*/
|
|
RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
|
|
ram_addr_t *offset)
|
|
{
|
|
RAMBlock *block;
|
|
uint8_t *host = ptr;
|
|
|
|
if (xen_enabled()) {
|
|
ram_addr_t ram_addr;
|
|
rcu_read_lock();
|
|
ram_addr = xen_ram_addr_from_mapcache(ptr);
|
|
block = qemu_get_ram_block(ram_addr);
|
|
if (block) {
|
|
*offset = ram_addr - block->offset;
|
|
}
|
|
rcu_read_unlock();
|
|
return block;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
block = atomic_rcu_read(&ram_list.mru_block);
|
|
if (block && block->host && host - block->host < block->max_length) {
|
|
goto found;
|
|
}
|
|
|
|
RAMBLOCK_FOREACH(block) {
|
|
/* This case append when the block is not mapped. */
|
|
if (block->host == NULL) {
|
|
continue;
|
|
}
|
|
if (host - block->host < block->max_length) {
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
|
|
found:
|
|
*offset = (host - block->host);
|
|
if (round_offset) {
|
|
*offset &= TARGET_PAGE_MASK;
|
|
}
|
|
rcu_read_unlock();
|
|
return block;
|
|
}
|
|
|
|
/*
|
|
* Finds the named RAMBlock
|
|
*
|
|
* name: The name of RAMBlock to find
|
|
*
|
|
* Returns: RAMBlock (or NULL if not found)
|
|
*/
|
|
RAMBlock *qemu_ram_block_by_name(const char *name)
|
|
{
|
|
RAMBlock *block;
|
|
|
|
RAMBLOCK_FOREACH(block) {
|
|
if (!strcmp(name, block->idstr)) {
|
|
return block;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Some of the softmmu routines need to translate from a host pointer
|
|
(typically a TLB entry) back to a ram offset. */
|
|
ram_addr_t qemu_ram_addr_from_host(void *ptr)
|
|
{
|
|
RAMBlock *block;
|
|
ram_addr_t offset;
|
|
|
|
block = qemu_ram_block_from_host(ptr, false, &offset);
|
|
if (!block) {
|
|
return RAM_ADDR_INVALID;
|
|
}
|
|
|
|
return block->offset + offset;
|
|
}
|
|
|
|
/* Called within RCU critical section. */
|
|
void memory_notdirty_write_prepare(NotDirtyInfo *ndi,
|
|
CPUState *cpu,
|
|
vaddr mem_vaddr,
|
|
ram_addr_t ram_addr,
|
|
unsigned size)
|
|
{
|
|
ndi->cpu = cpu;
|
|
ndi->ram_addr = ram_addr;
|
|
ndi->mem_vaddr = mem_vaddr;
|
|
ndi->size = size;
|
|
ndi->pages = NULL;
|
|
|
|
assert(tcg_enabled());
|
|
if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
|
|
ndi->pages = page_collection_lock(ram_addr, ram_addr + size);
|
|
tb_invalidate_phys_page_fast(ndi->pages, ram_addr, size);
|
|
}
|
|
}
|
|
|
|
/* Called within RCU critical section. */
|
|
void memory_notdirty_write_complete(NotDirtyInfo *ndi)
|
|
{
|
|
if (ndi->pages) {
|
|
assert(tcg_enabled());
|
|
page_collection_unlock(ndi->pages);
|
|
ndi->pages = NULL;
|
|
}
|
|
|
|
/* Set both VGA and migration bits for simplicity and to remove
|
|
* the notdirty callback faster.
|
|
*/
|
|
cpu_physical_memory_set_dirty_range(ndi->ram_addr, ndi->size,
|
|
DIRTY_CLIENTS_NOCODE);
|
|
/* we remove the notdirty callback only if the code has been
|
|
flushed */
|
|
if (!cpu_physical_memory_is_clean(ndi->ram_addr)) {
|
|
tlb_set_dirty(ndi->cpu, ndi->mem_vaddr);
|
|
}
|
|
}
|
|
|
|
/* Called within RCU critical section. */
|
|
static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
NotDirtyInfo ndi;
|
|
|
|
memory_notdirty_write_prepare(&ndi, current_cpu, current_cpu->mem_io_vaddr,
|
|
ram_addr, size);
|
|
|
|
stn_p(qemu_map_ram_ptr(NULL, ram_addr), size, val);
|
|
memory_notdirty_write_complete(&ndi);
|
|
}
|
|
|
|
static bool notdirty_mem_accepts(void *opaque, hwaddr addr,
|
|
unsigned size, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
return is_write;
|
|
}
|
|
|
|
static const MemoryRegionOps notdirty_mem_ops = {
|
|
.write = notdirty_mem_write,
|
|
.valid.accepts = notdirty_mem_accepts,
|
|
.endianness = DEVICE_NATIVE_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
};
|
|
|
|
/* Generate a debug exception if a watchpoint has been hit. */
|
|
static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
|
|
{
|
|
CPUState *cpu = current_cpu;
|
|
CPUClass *cc = CPU_GET_CLASS(cpu);
|
|
target_ulong vaddr;
|
|
CPUWatchpoint *wp;
|
|
|
|
assert(tcg_enabled());
|
|
if (cpu->watchpoint_hit) {
|
|
/* We re-entered the check after replacing the TB. Now raise
|
|
* the debug interrupt so that is will trigger after the
|
|
* current instruction. */
|
|
cpu_interrupt(cpu, CPU_INTERRUPT_DEBUG);
|
|
return;
|
|
}
|
|
vaddr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
|
|
vaddr = cc->adjust_watchpoint_address(cpu, vaddr, len);
|
|
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
|
|
if (cpu_watchpoint_address_matches(wp, vaddr, len)
|
|
&& (wp->flags & flags)) {
|
|
if (flags == BP_MEM_READ) {
|
|
wp->flags |= BP_WATCHPOINT_HIT_READ;
|
|
} else {
|
|
wp->flags |= BP_WATCHPOINT_HIT_WRITE;
|
|
}
|
|
wp->hitaddr = vaddr;
|
|
wp->hitattrs = attrs;
|
|
if (!cpu->watchpoint_hit) {
|
|
if (wp->flags & BP_CPU &&
|
|
!cc->debug_check_watchpoint(cpu, wp)) {
|
|
wp->flags &= ~BP_WATCHPOINT_HIT;
|
|
continue;
|
|
}
|
|
cpu->watchpoint_hit = wp;
|
|
|
|
mmap_lock();
|
|
tb_check_watchpoint(cpu);
|
|
if (wp->flags & BP_STOP_BEFORE_ACCESS) {
|
|
cpu->exception_index = EXCP_DEBUG;
|
|
mmap_unlock();
|
|
cpu_loop_exit(cpu);
|
|
} else {
|
|
/* Force execution of one insn next time. */
|
|
cpu->cflags_next_tb = 1 | curr_cflags();
|
|
mmap_unlock();
|
|
cpu_loop_exit_noexc(cpu);
|
|
}
|
|
}
|
|
} else {
|
|
wp->flags &= ~BP_WATCHPOINT_HIT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Watchpoint access routines. Watchpoints are inserted using TLB tricks,
|
|
so these check for a hit then pass through to the normal out-of-line
|
|
phys routines. */
|
|
static MemTxResult watch_mem_read(void *opaque, hwaddr addr, uint64_t *pdata,
|
|
unsigned size, MemTxAttrs attrs)
|
|
{
|
|
MemTxResult res;
|
|
uint64_t data;
|
|
int asidx = cpu_asidx_from_attrs(current_cpu, attrs);
|
|
AddressSpace *as = current_cpu->cpu_ases[asidx].as;
|
|
|
|
check_watchpoint(addr & ~TARGET_PAGE_MASK, size, attrs, BP_MEM_READ);
|
|
switch (size) {
|
|
case 1:
|
|
data = address_space_ldub(as, addr, attrs, &res);
|
|
break;
|
|
case 2:
|
|
data = address_space_lduw(as, addr, attrs, &res);
|
|
break;
|
|
case 4:
|
|
data = address_space_ldl(as, addr, attrs, &res);
|
|
break;
|
|
case 8:
|
|
data = address_space_ldq(as, addr, attrs, &res);
|
|
break;
|
|
default: abort();
|
|
}
|
|
*pdata = data;
|
|
return res;
|
|
}
|
|
|
|
static MemTxResult watch_mem_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size,
|
|
MemTxAttrs attrs)
|
|
{
|
|
MemTxResult res;
|
|
int asidx = cpu_asidx_from_attrs(current_cpu, attrs);
|
|
AddressSpace *as = current_cpu->cpu_ases[asidx].as;
|
|
|
|
check_watchpoint(addr & ~TARGET_PAGE_MASK, size, attrs, BP_MEM_WRITE);
|
|
switch (size) {
|
|
case 1:
|
|
address_space_stb(as, addr, val, attrs, &res);
|
|
break;
|
|
case 2:
|
|
address_space_stw(as, addr, val, attrs, &res);
|
|
break;
|
|
case 4:
|
|
address_space_stl(as, addr, val, attrs, &res);
|
|
break;
|
|
case 8:
|
|
address_space_stq(as, addr, val, attrs, &res);
|
|
break;
|
|
default: abort();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static const MemoryRegionOps watch_mem_ops = {
|
|
.read_with_attrs = watch_mem_read,
|
|
.write_with_attrs = watch_mem_write,
|
|
.endianness = DEVICE_NATIVE_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
};
|
|
|
|
static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
|
|
MemTxAttrs attrs, uint8_t *buf, hwaddr len);
|
|
static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
|
|
const uint8_t *buf, hwaddr len);
|
|
static bool flatview_access_valid(FlatView *fv, hwaddr addr, hwaddr len,
|
|
bool is_write, MemTxAttrs attrs);
|
|
|
|
static MemTxResult subpage_read(void *opaque, hwaddr addr, uint64_t *data,
|
|
unsigned len, MemTxAttrs attrs)
|
|
{
|
|
subpage_t *subpage = opaque;
|
|
uint8_t buf[8];
|
|
MemTxResult res;
|
|
|
|
#if defined(DEBUG_SUBPAGE)
|
|
printf("%s: subpage %p len %u addr " TARGET_FMT_plx "\n", __func__,
|
|
subpage, len, addr);
|
|
#endif
|
|
res = flatview_read(subpage->fv, addr + subpage->base, attrs, buf, len);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
*data = ldn_p(buf, len);
|
|
return MEMTX_OK;
|
|
}
|
|
|
|
static MemTxResult subpage_write(void *opaque, hwaddr addr,
|
|
uint64_t value, unsigned len, MemTxAttrs attrs)
|
|
{
|
|
subpage_t *subpage = opaque;
|
|
uint8_t buf[8];
|
|
|
|
#if defined(DEBUG_SUBPAGE)
|
|
printf("%s: subpage %p len %u addr " TARGET_FMT_plx
|
|
" value %"PRIx64"\n",
|
|
__func__, subpage, len, addr, value);
|
|
#endif
|
|
stn_p(buf, len, value);
|
|
return flatview_write(subpage->fv, addr + subpage->base, attrs, buf, len);
|
|
}
|
|
|
|
static bool subpage_accepts(void *opaque, hwaddr addr,
|
|
unsigned len, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
subpage_t *subpage = opaque;
|
|
#if defined(DEBUG_SUBPAGE)
|
|
printf("%s: subpage %p %c len %u addr " TARGET_FMT_plx "\n",
|
|
__func__, subpage, is_write ? 'w' : 'r', len, addr);
|
|
#endif
|
|
|
|
return flatview_access_valid(subpage->fv, addr + subpage->base,
|
|
len, is_write, attrs);
|
|
}
|
|
|
|
static const MemoryRegionOps subpage_ops = {
|
|
.read_with_attrs = subpage_read,
|
|
.write_with_attrs = subpage_write,
|
|
.impl.min_access_size = 1,
|
|
.impl.max_access_size = 8,
|
|
.valid.min_access_size = 1,
|
|
.valid.max_access_size = 8,
|
|
.valid.accepts = subpage_accepts,
|
|
.endianness = DEVICE_NATIVE_ENDIAN,
|
|
};
|
|
|
|
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
|
|
uint16_t section)
|
|
{
|
|
int idx, eidx;
|
|
|
|
if (start >= TARGET_PAGE_SIZE || end >= TARGET_PAGE_SIZE)
|
|
return -1;
|
|
idx = SUBPAGE_IDX(start);
|
|
eidx = SUBPAGE_IDX(end);
|
|
#if defined(DEBUG_SUBPAGE)
|
|
printf("%s: %p start %08x end %08x idx %08x eidx %08x section %d\n",
|
|
__func__, mmio, start, end, idx, eidx, section);
|
|
#endif
|
|
for (; idx <= eidx; idx++) {
|
|
mmio->sub_section[idx] = section;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static subpage_t *subpage_init(FlatView *fv, hwaddr base)
|
|
{
|
|
subpage_t *mmio;
|
|
|
|
mmio = g_malloc0(sizeof(subpage_t) + TARGET_PAGE_SIZE * sizeof(uint16_t));
|
|
mmio->fv = fv;
|
|
mmio->base = base;
|
|
memory_region_init_io(&mmio->iomem, NULL, &subpage_ops, mmio,
|
|
NULL, TARGET_PAGE_SIZE);
|
|
mmio->iomem.subpage = true;
|
|
#if defined(DEBUG_SUBPAGE)
|
|
printf("%s: %p base " TARGET_FMT_plx " len %08x\n", __func__,
|
|
mmio, base, TARGET_PAGE_SIZE);
|
|
#endif
|
|
subpage_register(mmio, 0, TARGET_PAGE_SIZE-1, PHYS_SECTION_UNASSIGNED);
|
|
|
|
return mmio;
|
|
}
|
|
|
|
static uint16_t dummy_section(PhysPageMap *map, FlatView *fv, MemoryRegion *mr)
|
|
{
|
|
assert(fv);
|
|
MemoryRegionSection section = {
|
|
.fv = fv,
|
|
.mr = mr,
|
|
.offset_within_address_space = 0,
|
|
.offset_within_region = 0,
|
|
.size = int128_2_64(),
|
|
};
|
|
|
|
return phys_section_add(map, §ion);
|
|
}
|
|
|
|
static void readonly_mem_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
/* Ignore any write to ROM. */
|
|
}
|
|
|
|
static bool readonly_mem_accepts(void *opaque, hwaddr addr,
|
|
unsigned size, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
return is_write;
|
|
}
|
|
|
|
/* This will only be used for writes, because reads are special cased
|
|
* to directly access the underlying host ram.
|
|
*/
|
|
static const MemoryRegionOps readonly_mem_ops = {
|
|
.write = readonly_mem_write,
|
|
.valid.accepts = readonly_mem_accepts,
|
|
.endianness = DEVICE_NATIVE_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 8,
|
|
.unaligned = false,
|
|
},
|
|
};
|
|
|
|
MemoryRegionSection *iotlb_to_section(CPUState *cpu,
|
|
hwaddr index, MemTxAttrs attrs)
|
|
{
|
|
int asidx = cpu_asidx_from_attrs(cpu, attrs);
|
|
CPUAddressSpace *cpuas = &cpu->cpu_ases[asidx];
|
|
AddressSpaceDispatch *d = atomic_rcu_read(&cpuas->memory_dispatch);
|
|
MemoryRegionSection *sections = d->map.sections;
|
|
|
|
return §ions[index & ~TARGET_PAGE_MASK];
|
|
}
|
|
|
|
static void io_mem_init(void)
|
|
{
|
|
memory_region_init_io(&io_mem_rom, NULL, &readonly_mem_ops,
|
|
NULL, NULL, UINT64_MAX);
|
|
memory_region_init_io(&io_mem_unassigned, NULL, &unassigned_mem_ops, NULL,
|
|
NULL, UINT64_MAX);
|
|
|
|
/* io_mem_notdirty calls tb_invalidate_phys_page_fast,
|
|
* which can be called without the iothread mutex.
|
|
*/
|
|
memory_region_init_io(&io_mem_notdirty, NULL, ¬dirty_mem_ops, NULL,
|
|
NULL, UINT64_MAX);
|
|
memory_region_clear_global_locking(&io_mem_notdirty);
|
|
|
|
memory_region_init_io(&io_mem_watch, NULL, &watch_mem_ops, NULL,
|
|
NULL, UINT64_MAX);
|
|
}
|
|
|
|
AddressSpaceDispatch *address_space_dispatch_new(FlatView *fv)
|
|
{
|
|
AddressSpaceDispatch *d = g_new0(AddressSpaceDispatch, 1);
|
|
uint16_t n;
|
|
|
|
n = dummy_section(&d->map, fv, &io_mem_unassigned);
|
|
assert(n == PHYS_SECTION_UNASSIGNED);
|
|
n = dummy_section(&d->map, fv, &io_mem_notdirty);
|
|
assert(n == PHYS_SECTION_NOTDIRTY);
|
|
n = dummy_section(&d->map, fv, &io_mem_rom);
|
|
assert(n == PHYS_SECTION_ROM);
|
|
n = dummy_section(&d->map, fv, &io_mem_watch);
|
|
assert(n == PHYS_SECTION_WATCH);
|
|
|
|
d->phys_map = (PhysPageEntry) { .ptr = PHYS_MAP_NODE_NIL, .skip = 1 };
|
|
|
|
return d;
|
|
}
|
|
|
|
void address_space_dispatch_free(AddressSpaceDispatch *d)
|
|
{
|
|
phys_sections_free(&d->map);
|
|
g_free(d);
|
|
}
|
|
|
|
static void tcg_commit(MemoryListener *listener)
|
|
{
|
|
CPUAddressSpace *cpuas;
|
|
AddressSpaceDispatch *d;
|
|
|
|
assert(tcg_enabled());
|
|
/* since each CPU stores ram addresses in its TLB cache, we must
|
|
reset the modified entries */
|
|
cpuas = container_of(listener, CPUAddressSpace, tcg_as_listener);
|
|
cpu_reloading_memory_map();
|
|
/* The CPU and TLB are protected by the iothread lock.
|
|
* We reload the dispatch pointer now because cpu_reloading_memory_map()
|
|
* may have split the RCU critical section.
|
|
*/
|
|
d = address_space_to_dispatch(cpuas->as);
|
|
atomic_rcu_set(&cpuas->memory_dispatch, d);
|
|
tlb_flush(cpuas->cpu);
|
|
}
|
|
|
|
static void memory_map_init(void)
|
|
{
|
|
system_memory = g_malloc(sizeof(*system_memory));
|
|
|
|
memory_region_init(system_memory, NULL, "system", UINT64_MAX);
|
|
address_space_init(&address_space_memory, system_memory, "memory");
|
|
|
|
system_io = g_malloc(sizeof(*system_io));
|
|
memory_region_init_io(system_io, NULL, &unassigned_io_ops, NULL, "io",
|
|
65536);
|
|
address_space_init(&address_space_io, system_io, "I/O");
|
|
}
|
|
|
|
MemoryRegion *get_system_memory(void)
|
|
{
|
|
return system_memory;
|
|
}
|
|
|
|
MemoryRegion *get_system_io(void)
|
|
{
|
|
return system_io;
|
|
}
|
|
|
|
#endif /* !defined(CONFIG_USER_ONLY) */
|
|
|
|
/* physical memory access (slow version, mainly for debug) */
|
|
#if defined(CONFIG_USER_ONLY)
|
|
int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
|
|
uint8_t *buf, target_ulong len, int is_write)
|
|
{
|
|
int flags;
|
|
target_ulong l, page;
|
|
void * p;
|
|
|
|
while (len > 0) {
|
|
page = addr & TARGET_PAGE_MASK;
|
|
l = (page + TARGET_PAGE_SIZE) - addr;
|
|
if (l > len)
|
|
l = len;
|
|
flags = page_get_flags(page);
|
|
if (!(flags & PAGE_VALID))
|
|
return -1;
|
|
if (is_write) {
|
|
if (!(flags & PAGE_WRITE))
|
|
return -1;
|
|
/* XXX: this code should not depend on lock_user */
|
|
if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
|
|
return -1;
|
|
memcpy(p, buf, l);
|
|
unlock_user(p, addr, l);
|
|
} else {
|
|
if (!(flags & PAGE_READ))
|
|
return -1;
|
|
/* XXX: this code should not depend on lock_user */
|
|
if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
|
|
return -1;
|
|
memcpy(buf, p, l);
|
|
unlock_user(p, addr, 0);
|
|
}
|
|
len -= l;
|
|
buf += l;
|
|
addr += l;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static void invalidate_and_set_dirty(MemoryRegion *mr, hwaddr addr,
|
|
hwaddr length)
|
|
{
|
|
uint8_t dirty_log_mask = memory_region_get_dirty_log_mask(mr);
|
|
addr += memory_region_get_ram_addr(mr);
|
|
|
|
/* No early return if dirty_log_mask is or becomes 0, because
|
|
* cpu_physical_memory_set_dirty_range will still call
|
|
* xen_modified_memory.
|
|
*/
|
|
if (dirty_log_mask) {
|
|
dirty_log_mask =
|
|
cpu_physical_memory_range_includes_clean(addr, length, dirty_log_mask);
|
|
}
|
|
if (dirty_log_mask & (1 << DIRTY_MEMORY_CODE)) {
|
|
assert(tcg_enabled());
|
|
tb_invalidate_phys_range(addr, addr + length);
|
|
dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
|
|
}
|
|
cpu_physical_memory_set_dirty_range(addr, length, dirty_log_mask);
|
|
}
|
|
|
|
void memory_region_flush_rom_device(MemoryRegion *mr, hwaddr addr, hwaddr size)
|
|
{
|
|
/*
|
|
* In principle this function would work on other memory region types too,
|
|
* but the ROM device use case is the only one where this operation is
|
|
* necessary. Other memory regions should use the
|
|
* address_space_read/write() APIs.
|
|
*/
|
|
assert(memory_region_is_romd(mr));
|
|
|
|
invalidate_and_set_dirty(mr, addr, size);
|
|
}
|
|
|
|
static int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr)
|
|
{
|
|
unsigned access_size_max = mr->ops->valid.max_access_size;
|
|
|
|
/* Regions are assumed to support 1-4 byte accesses unless
|
|
otherwise specified. */
|
|
if (access_size_max == 0) {
|
|
access_size_max = 4;
|
|
}
|
|
|
|
/* Bound the maximum access by the alignment of the address. */
|
|
if (!mr->ops->impl.unaligned) {
|
|
unsigned align_size_max = addr & -addr;
|
|
if (align_size_max != 0 && align_size_max < access_size_max) {
|
|
access_size_max = align_size_max;
|
|
}
|
|
}
|
|
|
|
/* Don't attempt accesses larger than the maximum. */
|
|
if (l > access_size_max) {
|
|
l = access_size_max;
|
|
}
|
|
l = pow2floor(l);
|
|
|
|
return l;
|
|
}
|
|
|
|
static bool prepare_mmio_access(MemoryRegion *mr)
|
|
{
|
|
bool unlocked = !qemu_mutex_iothread_locked();
|
|
bool release_lock = false;
|
|
|
|
if (unlocked && mr->global_locking) {
|
|
qemu_mutex_lock_iothread();
|
|
unlocked = false;
|
|
release_lock = true;
|
|
}
|
|
if (mr->flush_coalesced_mmio) {
|
|
if (unlocked) {
|
|
qemu_mutex_lock_iothread();
|
|
}
|
|
qemu_flush_coalesced_mmio_buffer();
|
|
if (unlocked) {
|
|
qemu_mutex_unlock_iothread();
|
|
}
|
|
}
|
|
|
|
return release_lock;
|
|
}
|
|
|
|
/* Called within RCU critical section. */
|
|
static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const uint8_t *buf,
|
|
hwaddr len, hwaddr addr1,
|
|
hwaddr l, MemoryRegion *mr)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemTxResult result = MEMTX_OK;
|
|
bool release_lock = false;
|
|
|
|
for (;;) {
|
|
if (!memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
l = memory_access_size(mr, l, addr1);
|
|
/* XXX: could force current_cpu to NULL to avoid
|
|
potential bugs */
|
|
val = ldn_p(buf, l);
|
|
result |= memory_region_dispatch_write(mr, addr1, val, l, attrs);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false);
|
|
memcpy(ptr, buf, l);
|
|
invalidate_and_set_dirty(mr, addr1, l);
|
|
}
|
|
|
|
if (release_lock) {
|
|
qemu_mutex_unlock_iothread();
|
|
release_lock = false;
|
|
}
|
|
|
|
len -= l;
|
|
buf += l;
|
|
addr += l;
|
|
|
|
if (!len) {
|
|
break;
|
|
}
|
|
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &addr1, &l, true, attrs);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Called from RCU critical section. */
|
|
static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
|
|
const uint8_t *buf, hwaddr len)
|
|
{
|
|
hwaddr l;
|
|
hwaddr addr1;
|
|
MemoryRegion *mr;
|
|
MemTxResult result = MEMTX_OK;
|
|
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &addr1, &l, true, attrs);
|
|
result = flatview_write_continue(fv, addr, attrs, buf, len,
|
|
addr1, l, mr);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Called within RCU critical section. */
|
|
MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
|
|
MemTxAttrs attrs, uint8_t *buf,
|
|
hwaddr len, hwaddr addr1, hwaddr l,
|
|
MemoryRegion *mr)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemTxResult result = MEMTX_OK;
|
|
bool release_lock = false;
|
|
|
|
for (;;) {
|
|
if (!memory_access_is_direct(mr, false)) {
|
|
/* I/O case */
|
|
release_lock |= prepare_mmio_access(mr);
|
|
l = memory_access_size(mr, l, addr1);
|
|
result |= memory_region_dispatch_read(mr, addr1, &val, l, attrs);
|
|
stn_p(buf, l, val);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false);
|
|
memcpy(buf, ptr, l);
|
|
}
|
|
|
|
if (release_lock) {
|
|
qemu_mutex_unlock_iothread();
|
|
release_lock = false;
|
|
}
|
|
|
|
len -= l;
|
|
buf += l;
|
|
addr += l;
|
|
|
|
if (!len) {
|
|
break;
|
|
}
|
|
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &addr1, &l, false, attrs);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Called from RCU critical section. */
|
|
static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
|
|
MemTxAttrs attrs, uint8_t *buf, hwaddr len)
|
|
{
|
|
hwaddr l;
|
|
hwaddr addr1;
|
|
MemoryRegion *mr;
|
|
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &addr1, &l, false, attrs);
|
|
return flatview_read_continue(fv, addr, attrs, buf, len,
|
|
addr1, l, mr);
|
|
}
|
|
|
|
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs, uint8_t *buf, hwaddr len)
|
|
{
|
|
MemTxResult result = MEMTX_OK;
|
|
FlatView *fv;
|
|
|
|
if (len > 0) {
|
|
rcu_read_lock();
|
|
fv = address_space_to_flatview(as);
|
|
result = flatview_read(fv, addr, attrs, buf, len);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const uint8_t *buf, hwaddr len)
|
|
{
|
|
MemTxResult result = MEMTX_OK;
|
|
FlatView *fv;
|
|
|
|
if (len > 0) {
|
|
rcu_read_lock();
|
|
fv = address_space_to_flatview(as);
|
|
result = flatview_write(fv, addr, attrs, buf, len);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
|
|
uint8_t *buf, hwaddr len, bool is_write)
|
|
{
|
|
if (is_write) {
|
|
return address_space_write(as, addr, attrs, buf, len);
|
|
} else {
|
|
return address_space_read_full(as, addr, attrs, buf, len);
|
|
}
|
|
}
|
|
|
|
void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
|
|
hwaddr len, int is_write)
|
|
{
|
|
address_space_rw(&address_space_memory, addr, MEMTXATTRS_UNSPECIFIED,
|
|
buf, len, is_write);
|
|
}
|
|
|
|
enum write_rom_type {
|
|
WRITE_DATA,
|
|
FLUSH_CACHE,
|
|
};
|
|
|
|
static inline MemTxResult address_space_write_rom_internal(AddressSpace *as,
|
|
hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const uint8_t *buf,
|
|
hwaddr len,
|
|
enum write_rom_type type)
|
|
{
|
|
hwaddr l;
|
|
uint8_t *ptr;
|
|
hwaddr addr1;
|
|
MemoryRegion *mr;
|
|
|
|
rcu_read_lock();
|
|
while (len > 0) {
|
|
l = len;
|
|
mr = address_space_translate(as, addr, &addr1, &l, true, attrs);
|
|
|
|
if (!(memory_region_is_ram(mr) ||
|
|
memory_region_is_romd(mr))) {
|
|
l = memory_access_size(mr, l, addr1);
|
|
} else {
|
|
/* ROM/RAM case */
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (type) {
|
|
case WRITE_DATA:
|
|
memcpy(ptr, buf, l);
|
|
invalidate_and_set_dirty(mr, addr1, l);
|
|
break;
|
|
case FLUSH_CACHE:
|
|
flush_icache_range((uintptr_t)ptr, (uintptr_t)ptr + l);
|
|
break;
|
|
}
|
|
}
|
|
len -= l;
|
|
buf += l;
|
|
addr += l;
|
|
}
|
|
rcu_read_unlock();
|
|
return MEMTX_OK;
|
|
}
|
|
|
|
/* used for ROM loading : can write in RAM and ROM */
|
|
MemTxResult address_space_write_rom(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const uint8_t *buf, hwaddr len)
|
|
{
|
|
return address_space_write_rom_internal(as, addr, attrs,
|
|
buf, len, WRITE_DATA);
|
|
}
|
|
|
|
void cpu_flush_icache_range(hwaddr start, hwaddr len)
|
|
{
|
|
/*
|
|
* This function should do the same thing as an icache flush that was
|
|
* triggered from within the guest. For TCG we are always cache coherent,
|
|
* so there is no need to flush anything. For KVM / Xen we need to flush
|
|
* the host's instruction cache at least.
|
|
*/
|
|
if (tcg_enabled()) {
|
|
return;
|
|
}
|
|
|
|
address_space_write_rom_internal(&address_space_memory,
|
|
start, MEMTXATTRS_UNSPECIFIED,
|
|
NULL, len, FLUSH_CACHE);
|
|
}
|
|
|
|
typedef struct {
|
|
MemoryRegion *mr;
|
|
void *buffer;
|
|
hwaddr addr;
|
|
hwaddr len;
|
|
bool in_use;
|
|
} BounceBuffer;
|
|
|
|
static BounceBuffer bounce;
|
|
|
|
typedef struct MapClient {
|
|
QEMUBH *bh;
|
|
QLIST_ENTRY(MapClient) link;
|
|
} MapClient;
|
|
|
|
QemuMutex map_client_list_lock;
|
|
static QLIST_HEAD(, MapClient) map_client_list
|
|
= QLIST_HEAD_INITIALIZER(map_client_list);
|
|
|
|
static void cpu_unregister_map_client_do(MapClient *client)
|
|
{
|
|
QLIST_REMOVE(client, link);
|
|
g_free(client);
|
|
}
|
|
|
|
static void cpu_notify_map_clients_locked(void)
|
|
{
|
|
MapClient *client;
|
|
|
|
while (!QLIST_EMPTY(&map_client_list)) {
|
|
client = QLIST_FIRST(&map_client_list);
|
|
qemu_bh_schedule(client->bh);
|
|
cpu_unregister_map_client_do(client);
|
|
}
|
|
}
|
|
|
|
void cpu_register_map_client(QEMUBH *bh)
|
|
{
|
|
MapClient *client = g_malloc(sizeof(*client));
|
|
|
|
qemu_mutex_lock(&map_client_list_lock);
|
|
client->bh = bh;
|
|
QLIST_INSERT_HEAD(&map_client_list, client, link);
|
|
if (!atomic_read(&bounce.in_use)) {
|
|
cpu_notify_map_clients_locked();
|
|
}
|
|
qemu_mutex_unlock(&map_client_list_lock);
|
|
}
|
|
|
|
void cpu_exec_init_all(void)
|
|
{
|
|
qemu_mutex_init(&ram_list.mutex);
|
|
/* The data structures we set up here depend on knowing the page size,
|
|
* so no more changes can be made after this point.
|
|
* In an ideal world, nothing we did before we had finished the
|
|
* machine setup would care about the target page size, and we could
|
|
* do this much later, rather than requiring board models to state
|
|
* up front what their requirements are.
|
|
*/
|
|
finalize_target_page_bits();
|
|
io_mem_init();
|
|
memory_map_init();
|
|
qemu_mutex_init(&map_client_list_lock);
|
|
}
|
|
|
|
void cpu_unregister_map_client(QEMUBH *bh)
|
|
{
|
|
MapClient *client;
|
|
|
|
qemu_mutex_lock(&map_client_list_lock);
|
|
QLIST_FOREACH(client, &map_client_list, link) {
|
|
if (client->bh == bh) {
|
|
cpu_unregister_map_client_do(client);
|
|
break;
|
|
}
|
|
}
|
|
qemu_mutex_unlock(&map_client_list_lock);
|
|
}
|
|
|
|
static void cpu_notify_map_clients(void)
|
|
{
|
|
qemu_mutex_lock(&map_client_list_lock);
|
|
cpu_notify_map_clients_locked();
|
|
qemu_mutex_unlock(&map_client_list_lock);
|
|
}
|
|
|
|
static bool flatview_access_valid(FlatView *fv, hwaddr addr, hwaddr len,
|
|
bool is_write, MemTxAttrs attrs)
|
|
{
|
|
MemoryRegion *mr;
|
|
hwaddr l, xlat;
|
|
|
|
while (len > 0) {
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &xlat, &l, is_write, attrs);
|
|
if (!memory_access_is_direct(mr, is_write)) {
|
|
l = memory_access_size(mr, l, addr);
|
|
if (!memory_region_access_valid(mr, xlat, l, is_write, attrs)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
len -= l;
|
|
addr += l;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool address_space_access_valid(AddressSpace *as, hwaddr addr,
|
|
hwaddr len, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
FlatView *fv;
|
|
bool result;
|
|
|
|
rcu_read_lock();
|
|
fv = address_space_to_flatview(as);
|
|
result = flatview_access_valid(fv, addr, len, is_write, attrs);
|
|
rcu_read_unlock();
|
|
return result;
|
|
}
|
|
|
|
static hwaddr
|
|
flatview_extend_translation(FlatView *fv, hwaddr addr,
|
|
hwaddr target_len,
|
|
MemoryRegion *mr, hwaddr base, hwaddr len,
|
|
bool is_write, MemTxAttrs attrs)
|
|
{
|
|
hwaddr done = 0;
|
|
hwaddr xlat;
|
|
MemoryRegion *this_mr;
|
|
|
|
for (;;) {
|
|
target_len -= len;
|
|
addr += len;
|
|
done += len;
|
|
if (target_len == 0) {
|
|
return done;
|
|
}
|
|
|
|
len = target_len;
|
|
this_mr = flatview_translate(fv, addr, &xlat,
|
|
&len, is_write, attrs);
|
|
if (this_mr != mr || xlat != base + done) {
|
|
return done;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Map a physical memory region into a host virtual address.
|
|
* May map a subset of the requested range, given by and returned in *plen.
|
|
* May return NULL if resources needed to perform the mapping are exhausted.
|
|
* Use only for reads OR writes - not for read-modify-write operations.
|
|
* Use cpu_register_map_client() to know when retrying the map operation is
|
|
* likely to succeed.
|
|
*/
|
|
void *address_space_map(AddressSpace *as,
|
|
hwaddr addr,
|
|
hwaddr *plen,
|
|
bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
hwaddr len = *plen;
|
|
hwaddr l, xlat;
|
|
MemoryRegion *mr;
|
|
void *ptr;
|
|
FlatView *fv;
|
|
|
|
if (len == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
l = len;
|
|
rcu_read_lock();
|
|
fv = address_space_to_flatview(as);
|
|
mr = flatview_translate(fv, addr, &xlat, &l, is_write, attrs);
|
|
|
|
if (!memory_access_is_direct(mr, is_write)) {
|
|
if (atomic_xchg(&bounce.in_use, true)) {
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
/* Avoid unbounded allocations */
|
|
l = MIN(l, TARGET_PAGE_SIZE);
|
|
bounce.buffer = qemu_memalign(TARGET_PAGE_SIZE, l);
|
|
bounce.addr = addr;
|
|
bounce.len = l;
|
|
|
|
memory_region_ref(mr);
|
|
bounce.mr = mr;
|
|
if (!is_write) {
|
|
flatview_read(fv, addr, MEMTXATTRS_UNSPECIFIED,
|
|
bounce.buffer, l);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
*plen = l;
|
|
return bounce.buffer;
|
|
}
|
|
|
|
|
|
memory_region_ref(mr);
|
|
*plen = flatview_extend_translation(fv, addr, len, mr, xlat,
|
|
l, is_write, attrs);
|
|
ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen, true);
|
|
rcu_read_unlock();
|
|
|
|
return ptr;
|
|
}
|
|
|
|
/* Unmaps a memory region previously mapped by address_space_map().
|
|
* Will also mark the memory as dirty if is_write == 1. access_len gives
|
|
* the amount of memory that was actually read or written by the caller.
|
|
*/
|
|
void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
|
|
int is_write, hwaddr access_len)
|
|
{
|
|
if (buffer != bounce.buffer) {
|
|
MemoryRegion *mr;
|
|
ram_addr_t addr1;
|
|
|
|
mr = memory_region_from_host(buffer, &addr1);
|
|
assert(mr != NULL);
|
|
if (is_write) {
|
|
invalidate_and_set_dirty(mr, addr1, access_len);
|
|
}
|
|
if (xen_enabled()) {
|
|
xen_invalidate_map_cache_entry(buffer);
|
|
}
|
|
memory_region_unref(mr);
|
|
return;
|
|
}
|
|
if (is_write) {
|
|
address_space_write(as, bounce.addr, MEMTXATTRS_UNSPECIFIED,
|
|
bounce.buffer, access_len);
|
|
}
|
|
qemu_vfree(bounce.buffer);
|
|
bounce.buffer = NULL;
|
|
memory_region_unref(bounce.mr);
|
|
atomic_mb_set(&bounce.in_use, false);
|
|
cpu_notify_map_clients();
|
|
}
|
|
|
|
void *cpu_physical_memory_map(hwaddr addr,
|
|
hwaddr *plen,
|
|
int is_write)
|
|
{
|
|
return address_space_map(&address_space_memory, addr, plen, is_write,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
}
|
|
|
|
void cpu_physical_memory_unmap(void *buffer, hwaddr len,
|
|
int is_write, hwaddr access_len)
|
|
{
|
|
return address_space_unmap(&address_space_memory, buffer, len, is_write, access_len);
|
|
}
|
|
|
|
#define ARG1_DECL AddressSpace *as
|
|
#define ARG1 as
|
|
#define SUFFIX
|
|
#define TRANSLATE(...) address_space_translate(as, __VA_ARGS__)
|
|
#define RCU_READ_LOCK(...) rcu_read_lock()
|
|
#define RCU_READ_UNLOCK(...) rcu_read_unlock()
|
|
#include "memory_ldst.inc.c"
|
|
|
|
int64_t address_space_cache_init(MemoryRegionCache *cache,
|
|
AddressSpace *as,
|
|
hwaddr addr,
|
|
hwaddr len,
|
|
bool is_write)
|
|
{
|
|
AddressSpaceDispatch *d;
|
|
hwaddr l;
|
|
MemoryRegion *mr;
|
|
|
|
assert(len > 0);
|
|
|
|
l = len;
|
|
cache->fv = address_space_get_flatview(as);
|
|
d = flatview_to_dispatch(cache->fv);
|
|
cache->mrs = *address_space_translate_internal(d, addr, &cache->xlat, &l, true);
|
|
|
|
mr = cache->mrs.mr;
|
|
memory_region_ref(mr);
|
|
if (memory_access_is_direct(mr, is_write)) {
|
|
/* We don't care about the memory attributes here as we're only
|
|
* doing this if we found actual RAM, which behaves the same
|
|
* regardless of attributes; so UNSPECIFIED is fine.
|
|
*/
|
|
l = flatview_extend_translation(cache->fv, addr, len, mr,
|
|
cache->xlat, l, is_write,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
cache->ptr = qemu_ram_ptr_length(mr->ram_block, cache->xlat, &l, true);
|
|
} else {
|
|
cache->ptr = NULL;
|
|
}
|
|
|
|
cache->len = l;
|
|
cache->is_write = is_write;
|
|
return l;
|
|
}
|
|
|
|
void address_space_cache_invalidate(MemoryRegionCache *cache,
|
|
hwaddr addr,
|
|
hwaddr access_len)
|
|
{
|
|
assert(cache->is_write);
|
|
if (likely(cache->ptr)) {
|
|
invalidate_and_set_dirty(cache->mrs.mr, addr + cache->xlat, access_len);
|
|
}
|
|
}
|
|
|
|
void address_space_cache_destroy(MemoryRegionCache *cache)
|
|
{
|
|
if (!cache->mrs.mr) {
|
|
return;
|
|
}
|
|
|
|
if (xen_enabled()) {
|
|
xen_invalidate_map_cache_entry(cache->ptr);
|
|
}
|
|
memory_region_unref(cache->mrs.mr);
|
|
flatview_unref(cache->fv);
|
|
cache->mrs.mr = NULL;
|
|
cache->fv = NULL;
|
|
}
|
|
|
|
/* Called from RCU critical section. This function has the same
|
|
* semantics as address_space_translate, but it only works on a
|
|
* predefined range of a MemoryRegion that was mapped with
|
|
* address_space_cache_init.
|
|
*/
|
|
static inline MemoryRegion *address_space_translate_cached(
|
|
MemoryRegionCache *cache, hwaddr addr, hwaddr *xlat,
|
|
hwaddr *plen, bool is_write, MemTxAttrs attrs)
|
|
{
|
|
MemoryRegionSection section;
|
|
MemoryRegion *mr;
|
|
IOMMUMemoryRegion *iommu_mr;
|
|
AddressSpace *target_as;
|
|
|
|
assert(!cache->ptr);
|
|
*xlat = addr + cache->xlat;
|
|
|
|
mr = cache->mrs.mr;
|
|
iommu_mr = memory_region_get_iommu(mr);
|
|
if (!iommu_mr) {
|
|
/* MMIO region. */
|
|
return mr;
|
|
}
|
|
|
|
section = address_space_translate_iommu(iommu_mr, xlat, plen,
|
|
NULL, is_write, true,
|
|
&target_as, attrs);
|
|
return section.mr;
|
|
}
|
|
|
|
/* Called from RCU critical section. address_space_read_cached uses this
|
|
* out of line function when the target is an MMIO or IOMMU region.
|
|
*/
|
|
void
|
|
address_space_read_cached_slow(MemoryRegionCache *cache, hwaddr addr,
|
|
void *buf, hwaddr len)
|
|
{
|
|
hwaddr addr1, l;
|
|
MemoryRegion *mr;
|
|
|
|
l = len;
|
|
mr = address_space_translate_cached(cache, addr, &addr1, &l, false,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
flatview_read_continue(cache->fv,
|
|
addr, MEMTXATTRS_UNSPECIFIED, buf, len,
|
|
addr1, l, mr);
|
|
}
|
|
|
|
/* Called from RCU critical section. address_space_write_cached uses this
|
|
* out of line function when the target is an MMIO or IOMMU region.
|
|
*/
|
|
void
|
|
address_space_write_cached_slow(MemoryRegionCache *cache, hwaddr addr,
|
|
const void *buf, hwaddr len)
|
|
{
|
|
hwaddr addr1, l;
|
|
MemoryRegion *mr;
|
|
|
|
l = len;
|
|
mr = address_space_translate_cached(cache, addr, &addr1, &l, true,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
flatview_write_continue(cache->fv,
|
|
addr, MEMTXATTRS_UNSPECIFIED, buf, len,
|
|
addr1, l, mr);
|
|
}
|
|
|
|
#define ARG1_DECL MemoryRegionCache *cache
|
|
#define ARG1 cache
|
|
#define SUFFIX _cached_slow
|
|
#define TRANSLATE(...) address_space_translate_cached(cache, __VA_ARGS__)
|
|
#define RCU_READ_LOCK() ((void)0)
|
|
#define RCU_READ_UNLOCK() ((void)0)
|
|
#include "memory_ldst.inc.c"
|
|
|
|
/* virtual memory access for debug (includes writing to ROM) */
|
|
int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
|
|
uint8_t *buf, target_ulong len, int is_write)
|
|
{
|
|
hwaddr phys_addr;
|
|
target_ulong l, page;
|
|
|
|
cpu_synchronize_state(cpu);
|
|
while (len > 0) {
|
|
int asidx;
|
|
MemTxAttrs attrs;
|
|
|
|
page = addr & TARGET_PAGE_MASK;
|
|
phys_addr = cpu_get_phys_page_attrs_debug(cpu, page, &attrs);
|
|
asidx = cpu_asidx_from_attrs(cpu, attrs);
|
|
/* if no physical page mapped, return an error */
|
|
if (phys_addr == -1)
|
|
return -1;
|
|
l = (page + TARGET_PAGE_SIZE) - addr;
|
|
if (l > len)
|
|
l = len;
|
|
phys_addr += (addr & ~TARGET_PAGE_MASK);
|
|
if (is_write) {
|
|
address_space_write_rom(cpu->cpu_ases[asidx].as, phys_addr,
|
|
attrs, buf, l);
|
|
} else {
|
|
address_space_rw(cpu->cpu_ases[asidx].as, phys_addr,
|
|
attrs, buf, l, 0);
|
|
}
|
|
len -= l;
|
|
buf += l;
|
|
addr += l;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allows code that needs to deal with migration bitmaps etc to still be built
|
|
* target independent.
|
|
*/
|
|
size_t qemu_target_page_size(void)
|
|
{
|
|
return TARGET_PAGE_SIZE;
|
|
}
|
|
|
|
int qemu_target_page_bits(void)
|
|
{
|
|
return TARGET_PAGE_BITS;
|
|
}
|
|
|
|
int qemu_target_page_bits_min(void)
|
|
{
|
|
return TARGET_PAGE_BITS_MIN;
|
|
}
|
|
#endif
|
|
|
|
bool target_words_bigendian(void)
|
|
{
|
|
#if defined(TARGET_WORDS_BIGENDIAN)
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
bool cpu_physical_memory_is_io(hwaddr phys_addr)
|
|
{
|
|
MemoryRegion*mr;
|
|
hwaddr l = 1;
|
|
bool res;
|
|
|
|
rcu_read_lock();
|
|
mr = address_space_translate(&address_space_memory,
|
|
phys_addr, &phys_addr, &l, false,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
|
|
res = !(memory_region_is_ram(mr) || memory_region_is_romd(mr));
|
|
rcu_read_unlock();
|
|
return res;
|
|
}
|
|
|
|
int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque)
|
|
{
|
|
RAMBlock *block;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
RAMBLOCK_FOREACH(block) {
|
|
ret = func(block, opaque);
|
|
if (ret) {
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Unmap pages of memory from start to start+length such that
|
|
* they a) read as 0, b) Trigger whatever fault mechanism
|
|
* the OS provides for postcopy.
|
|
* The pages must be unmapped by the end of the function.
|
|
* Returns: 0 on success, none-0 on failure
|
|
*
|
|
*/
|
|
int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
|
|
{
|
|
int ret = -1;
|
|
|
|
uint8_t *host_startaddr = rb->host + start;
|
|
|
|
if ((uintptr_t)host_startaddr & (rb->page_size - 1)) {
|
|
error_report("ram_block_discard_range: Unaligned start address: %p",
|
|
host_startaddr);
|
|
goto err;
|
|
}
|
|
|
|
if ((start + length) <= rb->used_length) {
|
|
bool need_madvise, need_fallocate;
|
|
uint8_t *host_endaddr = host_startaddr + length;
|
|
if ((uintptr_t)host_endaddr & (rb->page_size - 1)) {
|
|
error_report("ram_block_discard_range: Unaligned end address: %p",
|
|
host_endaddr);
|
|
goto err;
|
|
}
|
|
|
|
errno = ENOTSUP; /* If we are missing MADVISE etc */
|
|
|
|
/* The logic here is messy;
|
|
* madvise DONTNEED fails for hugepages
|
|
* fallocate works on hugepages and shmem
|
|
*/
|
|
need_madvise = (rb->page_size == qemu_host_page_size);
|
|
need_fallocate = rb->fd != -1;
|
|
if (need_fallocate) {
|
|
/* For a file, this causes the area of the file to be zero'd
|
|
* if read, and for hugetlbfs also causes it to be unmapped
|
|
* so a userfault will trigger.
|
|
*/
|
|
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
|
|
ret = fallocate(rb->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
start, length);
|
|
if (ret) {
|
|
ret = -errno;
|
|
error_report("ram_block_discard_range: Failed to fallocate "
|
|
"%s:%" PRIx64 " +%zx (%d)",
|
|
rb->idstr, start, length, ret);
|
|
goto err;
|
|
}
|
|
#else
|
|
ret = -ENOSYS;
|
|
error_report("ram_block_discard_range: fallocate not available/file"
|
|
"%s:%" PRIx64 " +%zx (%d)",
|
|
rb->idstr, start, length, ret);
|
|
goto err;
|
|
#endif
|
|
}
|
|
if (need_madvise) {
|
|
/* For normal RAM this causes it to be unmapped,
|
|
* for shared memory it causes the local mapping to disappear
|
|
* and to fall back on the file contents (which we just
|
|
* fallocate'd away).
|
|
*/
|
|
#if defined(CONFIG_MADVISE)
|
|
ret = madvise(host_startaddr, length, MADV_DONTNEED);
|
|
if (ret) {
|
|
ret = -errno;
|
|
error_report("ram_block_discard_range: Failed to discard range "
|
|
"%s:%" PRIx64 " +%zx (%d)",
|
|
rb->idstr, start, length, ret);
|
|
goto err;
|
|
}
|
|
#else
|
|
ret = -ENOSYS;
|
|
error_report("ram_block_discard_range: MADVISE not available"
|
|
"%s:%" PRIx64 " +%zx (%d)",
|
|
rb->idstr, start, length, ret);
|
|
goto err;
|
|
#endif
|
|
}
|
|
trace_ram_block_discard_range(rb->idstr, host_startaddr, length,
|
|
need_madvise, need_fallocate, ret);
|
|
} else {
|
|
error_report("ram_block_discard_range: Overrun block '%s' (%" PRIu64
|
|
"/%zx/" RAM_ADDR_FMT")",
|
|
rb->idstr, start, length, rb->used_length);
|
|
}
|
|
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
bool ramblock_is_pmem(RAMBlock *rb)
|
|
{
|
|
return rb->flags & RAM_PMEM;
|
|
}
|
|
|
|
#endif
|
|
|
|
void page_size_init(void)
|
|
{
|
|
/* NOTE: we can always suppose that qemu_host_page_size >=
|
|
TARGET_PAGE_SIZE */
|
|
if (qemu_host_page_size == 0) {
|
|
qemu_host_page_size = qemu_real_host_page_size;
|
|
}
|
|
if (qemu_host_page_size < TARGET_PAGE_SIZE) {
|
|
qemu_host_page_size = TARGET_PAGE_SIZE;
|
|
}
|
|
qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
|
|
}
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
|
|
static void mtree_print_phys_entries(int start, int end, int skip, int ptr)
|
|
{
|
|
if (start == end - 1) {
|
|
qemu_printf("\t%3d ", start);
|
|
} else {
|
|
qemu_printf("\t%3d..%-3d ", start, end - 1);
|
|
}
|
|
qemu_printf(" skip=%d ", skip);
|
|
if (ptr == PHYS_MAP_NODE_NIL) {
|
|
qemu_printf(" ptr=NIL");
|
|
} else if (!skip) {
|
|
qemu_printf(" ptr=#%d", ptr);
|
|
} else {
|
|
qemu_printf(" ptr=[%d]", ptr);
|
|
}
|
|
qemu_printf("\n");
|
|
}
|
|
|
|
#define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
|
|
int128_sub((size), int128_one())) : 0)
|
|
|
|
void mtree_print_dispatch(AddressSpaceDispatch *d, MemoryRegion *root)
|
|
{
|
|
int i;
|
|
|
|
qemu_printf(" Dispatch\n");
|
|
qemu_printf(" Physical sections\n");
|
|
|
|
for (i = 0; i < d->map.sections_nb; ++i) {
|
|
MemoryRegionSection *s = d->map.sections + i;
|
|
const char *names[] = { " [unassigned]", " [not dirty]",
|
|
" [ROM]", " [watch]" };
|
|
|
|
qemu_printf(" #%d @" TARGET_FMT_plx ".." TARGET_FMT_plx
|
|
" %s%s%s%s%s",
|
|
i,
|
|
s->offset_within_address_space,
|
|
s->offset_within_address_space + MR_SIZE(s->mr->size),
|
|
s->mr->name ? s->mr->name : "(noname)",
|
|
i < ARRAY_SIZE(names) ? names[i] : "",
|
|
s->mr == root ? " [ROOT]" : "",
|
|
s == d->mru_section ? " [MRU]" : "",
|
|
s->mr->is_iommu ? " [iommu]" : "");
|
|
|
|
if (s->mr->alias) {
|
|
qemu_printf(" alias=%s", s->mr->alias->name ?
|
|
s->mr->alias->name : "noname");
|
|
}
|
|
qemu_printf("\n");
|
|
}
|
|
|
|
qemu_printf(" Nodes (%d bits per level, %d levels) ptr=[%d] skip=%d\n",
|
|
P_L2_BITS, P_L2_LEVELS, d->phys_map.ptr, d->phys_map.skip);
|
|
for (i = 0; i < d->map.nodes_nb; ++i) {
|
|
int j, jprev;
|
|
PhysPageEntry prev;
|
|
Node *n = d->map.nodes + i;
|
|
|
|
qemu_printf(" [%d]\n", i);
|
|
|
|
for (j = 0, jprev = 0, prev = *n[0]; j < ARRAY_SIZE(*n); ++j) {
|
|
PhysPageEntry *pe = *n + j;
|
|
|
|
if (pe->ptr == prev.ptr && pe->skip == prev.skip) {
|
|
continue;
|
|
}
|
|
|
|
mtree_print_phys_entries(jprev, j, prev.skip, prev.ptr);
|
|
|
|
jprev = j;
|
|
prev = *pe;
|
|
}
|
|
|
|
if (jprev != ARRAY_SIZE(*n)) {
|
|
mtree_print_phys_entries(jprev, j, prev.skip, prev.ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|