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https://github.com/torvalds/linux
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38620fc4e8
When running as PVH or HVM Linux will use holes in the memory map as scratch space to map grants, foreign domain pages and possibly miscellaneous other stuff. However the usage of such memory map holes for Xen purposes can be problematic. The request of holesby Xen happen quite early in the kernel boot process (grant table setup already uses scratch map space), and it's possible that by then not all devices have reclaimed their MMIO space. It's not unlikely for chunks of Xen scratch map space to end up using PCI bridge MMIO window memory, which (as expected) causes quite a lot of issues in the system. At least for PVH dom0 we have the possibility of using regions marked as UNUSABLE in the e820 memory map. Either if the region is UNUSABLE in the native memory map, or it has been converted into UNUSABLE in order to hide RAM regions from dom0, the second stage translation page-tables can populate those areas without issues. PV already has this kind of logic, where the balloon driver is inflated at boot. Re-use the current logic in order to also inflate it when running as PVH. onvert UNUSABLE regions up to the ratio specified in EXTRA_MEM_RATIO to RAM, while reserving them using xen_add_extra_mem() (which is also moved so it's no longer tied to CONFIG_PV). [jgross: fixed build for CONFIG_PVH without CONFIG_XEN_PVH] Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20240220174341.56131-1-roger.pau@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com>
181 lines
4.8 KiB
C
181 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef XEN_OPS_H
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#define XEN_OPS_H
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#include <linux/init.h>
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#include <linux/clocksource.h>
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#include <linux/irqreturn.h>
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#include <xen/xen-ops.h>
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/* These are code, but not functions. Defined in entry.S */
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extern const char xen_failsafe_callback[];
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void xen_entry_SYSENTER_compat(void);
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#ifdef CONFIG_X86_64
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void xen_entry_SYSCALL_64(void);
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void xen_entry_SYSCALL_compat(void);
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#endif
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extern void *xen_initial_gdt;
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struct trap_info;
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void xen_copy_trap_info(struct trap_info *traps);
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DECLARE_PER_CPU_ALIGNED(struct vcpu_info, xen_vcpu_info);
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DECLARE_PER_CPU(unsigned long, xen_cr3);
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DECLARE_PER_CPU(unsigned long, xen_current_cr3);
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extern struct start_info *xen_start_info;
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extern struct shared_info xen_dummy_shared_info;
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extern struct shared_info *HYPERVISOR_shared_info;
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extern bool xen_fifo_events;
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void xen_setup_mfn_list_list(void);
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void xen_build_mfn_list_list(void);
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void xen_setup_machphys_mapping(void);
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void xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
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void __init xen_reserve_special_pages(void);
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void __init xen_pt_check_e820(void);
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void xen_mm_pin_all(void);
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void xen_mm_unpin_all(void);
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#ifdef CONFIG_X86_64
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void __init xen_relocate_p2m(void);
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#endif
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bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size);
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unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
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void __init xen_inv_extra_mem(void);
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void __init xen_remap_memory(void);
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phys_addr_t __init xen_find_free_area(phys_addr_t size);
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char * __init xen_memory_setup(void);
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void __init xen_arch_setup(void);
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void xen_banner(void);
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void xen_enable_sysenter(void);
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void xen_enable_syscall(void);
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void xen_vcpu_restore(void);
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void xen_hvm_init_shared_info(void);
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void xen_unplug_emulated_devices(void);
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void __init xen_build_dynamic_phys_to_machine(void);
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void __init xen_vmalloc_p2m_tree(void);
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void xen_init_irq_ops(void);
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void xen_setup_timer(int cpu);
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void xen_setup_runstate_info(int cpu);
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void xen_teardown_timer(int cpu);
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void xen_setup_cpu_clockevents(void);
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void xen_save_time_memory_area(void);
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void xen_restore_time_memory_area(void);
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void xen_init_time_ops(void);
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void xen_hvm_init_time_ops(void);
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bool xen_vcpu_stolen(int vcpu);
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void xen_vcpu_setup(int cpu);
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void xen_vcpu_info_reset(int cpu);
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void xen_setup_vcpu_info_placement(void);
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#ifdef CONFIG_SMP
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void xen_smp_init(void);
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void __init xen_hvm_smp_init(void);
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extern cpumask_var_t xen_cpu_initialized_map;
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#else
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static inline void xen_smp_init(void) {}
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static inline void xen_hvm_smp_init(void) {}
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#endif
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#ifdef CONFIG_PARAVIRT_SPINLOCKS
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void __init xen_init_spinlocks(void);
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void xen_init_lock_cpu(int cpu);
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void xen_uninit_lock_cpu(int cpu);
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#else
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static inline void xen_init_spinlocks(void)
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{
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}
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static inline void xen_init_lock_cpu(int cpu)
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{
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}
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static inline void xen_uninit_lock_cpu(int cpu)
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{
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}
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#endif
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struct dom0_vga_console_info;
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#ifdef CONFIG_XEN_DOM0
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void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size,
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struct screen_info *);
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#else
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static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
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size_t size, struct screen_info *si)
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{
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}
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#endif
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void xen_add_preferred_consoles(void);
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void __init xen_init_apic(void);
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#ifdef CONFIG_XEN_EFI
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extern void xen_efi_init(struct boot_params *boot_params);
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#else
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static inline void __init xen_efi_init(struct boot_params *boot_params)
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{
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}
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#endif
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__visible void xen_irq_enable_direct(void);
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__visible void xen_irq_disable_direct(void);
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__visible unsigned long xen_save_fl_direct(void);
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__visible unsigned long xen_read_cr2(void);
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__visible unsigned long xen_read_cr2_direct(void);
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/* These are not functions, and cannot be called normally */
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__visible void xen_iret(void);
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extern int xen_panic_handler_init(void);
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int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
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int (*cpu_dead_cb)(unsigned int));
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void xen_pin_vcpu(int cpu);
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void xen_emergency_restart(void);
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void xen_force_evtchn_callback(void);
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#ifdef CONFIG_XEN_PV
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void xen_pv_pre_suspend(void);
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void xen_pv_post_suspend(int suspend_cancelled);
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void xen_start_kernel(struct start_info *si);
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#else
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static inline void xen_pv_pre_suspend(void) {}
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static inline void xen_pv_post_suspend(int suspend_cancelled) {}
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#endif
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#ifdef CONFIG_XEN_PVHVM
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void xen_hvm_post_suspend(int suspend_cancelled);
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#else
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static inline void xen_hvm_post_suspend(int suspend_cancelled) {}
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#endif
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/*
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* The maximum amount of extra memory compared to the base size. The
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* main scaling factor is the size of struct page. At extreme ratios
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* of base:extra, all the base memory can be filled with page
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* structures for the extra memory, leaving no space for anything
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* else.
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*
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* 10x seems like a reasonable balance between scaling flexibility and
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* leaving a practically usable system.
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*/
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#define EXTRA_MEM_RATIO (10)
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void xen_add_extra_mem(unsigned long start_pfn, unsigned long n_pfns);
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#endif /* XEN_OPS_H */
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