qemu/numa.c
Eduardo Habkost 12d6e4640c numa: Reject configuration if not all node IDs are present
We don't support sparse NUMA node IDs yet, so this changes QEMU to
reject configs where not all nodes are present.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2014-06-29 18:59:42 +03:00

392 lines
11 KiB
C

/*
* NUMA parameter parsing routines
*
* Copyright (c) 2014 Fujitsu Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysemu/sysemu.h"
#include "exec/cpu-common.h"
#include "qemu/bitmap.h"
#include "qom/cpu.h"
#include "qemu/error-report.h"
#include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
#include "qapi-visit.h"
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
#include "qapi/qmp/qerror.h"
#include "hw/boards.h"
#include "sysemu/hostmem.h"
#include "qmp-commands.h"
QemuOptsList qemu_numa_opts = {
.name = "numa",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_numa_opts.head),
.desc = { { 0 } } /* validated with OptsVisitor */
};
static int have_memdevs = -1;
static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
{
uint16_t nodenr;
uint16List *cpus = NULL;
if (node->has_nodeid) {
nodenr = node->nodeid;
} else {
nodenr = nb_numa_nodes;
}
if (nodenr >= MAX_NODES) {
error_setg(errp, "Max number of NUMA nodes reached: %"
PRIu16 "\n", nodenr);
return;
}
if (numa_info[nodenr].present) {
error_setg(errp, "Duplicate NUMA nodeid: %" PRIu16, nodenr);
return;
}
for (cpus = node->cpus; cpus; cpus = cpus->next) {
if (cpus->value > MAX_CPUMASK_BITS) {
error_setg(errp, "CPU number %" PRIu16 " is bigger than %d",
cpus->value, MAX_CPUMASK_BITS);
return;
}
bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
}
if (node->has_mem && node->has_memdev) {
error_setg(errp, "qemu: cannot specify both mem= and memdev=\n");
return;
}
if (have_memdevs == -1) {
have_memdevs = node->has_memdev;
}
if (node->has_memdev != have_memdevs) {
error_setg(errp, "qemu: memdev option must be specified for either "
"all or no nodes\n");
return;
}
if (node->has_mem) {
uint64_t mem_size = node->mem;
const char *mem_str = qemu_opt_get(opts, "mem");
/* Fix up legacy suffix-less format */
if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
mem_size <<= 20;
}
numa_info[nodenr].node_mem = mem_size;
}
if (node->has_memdev) {
Object *o;
o = object_resolve_path_type(node->memdev, TYPE_MEMORY_BACKEND, NULL);
if (!o) {
error_setg(errp, "memdev=%s is ambiguous", node->memdev);
return;
}
object_ref(o);
numa_info[nodenr].node_mem = object_property_get_int(o, "size", NULL);
numa_info[nodenr].node_memdev = MEMORY_BACKEND(o);
}
numa_info[nodenr].present = true;
max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1);
}
int numa_init_func(QemuOpts *opts, void *opaque)
{
NumaOptions *object = NULL;
Error *err = NULL;
{
OptsVisitor *ov = opts_visitor_new(opts);
visit_type_NumaOptions(opts_get_visitor(ov), &object, NULL, &err);
opts_visitor_cleanup(ov);
}
if (err) {
goto error;
}
switch (object->kind) {
case NUMA_OPTIONS_KIND_NODE:
numa_node_parse(object->node, opts, &err);
if (err) {
goto error;
}
nb_numa_nodes++;
break;
default:
abort();
}
return 0;
error:
qerror_report_err(err);
error_free(err);
if (object) {
QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
visit_type_NumaOptions(qapi_dealloc_get_visitor(dv),
&object, NULL, NULL);
qapi_dealloc_visitor_cleanup(dv);
}
return -1;
}
void set_numa_nodes(void)
{
int i;
assert(max_numa_nodeid <= MAX_NODES);
/* No support for sparse NUMA node IDs yet: */
for (i = max_numa_nodeid - 1; i >= 0; i--) {
/* Report large node IDs first, to make mistakes easier to spot */
if (!numa_info[i].present) {
error_report("numa: Node ID missing: %d", i);
exit(1);
}
}
/* This must be always true if all nodes are present: */
assert(nb_numa_nodes == max_numa_nodeid);
if (nb_numa_nodes > 0) {
uint64_t numa_total;
if (nb_numa_nodes > MAX_NODES) {
nb_numa_nodes = MAX_NODES;
}
/* If no memory size is given for any node, assume the default case
* and distribute the available memory equally across all nodes
*/
for (i = 0; i < nb_numa_nodes; i++) {
if (numa_info[i].node_mem != 0) {
break;
}
}
if (i == nb_numa_nodes) {
uint64_t usedmem = 0;
/* On Linux, each node's border has to be 8MB aligned,
* the final node gets the rest.
*/
for (i = 0; i < nb_numa_nodes - 1; i++) {
numa_info[i].node_mem = (ram_size / nb_numa_nodes) &
~((1 << 23UL) - 1);
usedmem += numa_info[i].node_mem;
}
numa_info[i].node_mem = ram_size - usedmem;
}
numa_total = 0;
for (i = 0; i < nb_numa_nodes; i++) {
numa_total += numa_info[i].node_mem;
}
if (numa_total != ram_size) {
error_report("total memory for NUMA nodes (%" PRIu64 ")"
" should equal RAM size (" RAM_ADDR_FMT ")",
numa_total, ram_size);
exit(1);
}
for (i = 0; i < nb_numa_nodes; i++) {
if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
break;
}
}
/* assigning the VCPUs round-robin is easier to implement, guest OSes
* must cope with this anyway, because there are BIOSes out there in
* real machines which also use this scheme.
*/
if (i == nb_numa_nodes) {
for (i = 0; i < max_cpus; i++) {
set_bit(i, numa_info[i % nb_numa_nodes].node_cpu);
}
}
}
}
void set_numa_modes(void)
{
CPUState *cpu;
int i;
CPU_FOREACH(cpu) {
for (i = 0; i < nb_numa_nodes; i++) {
if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
cpu->numa_node = i;
}
}
}
}
static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
const char *name,
uint64_t ram_size)
{
if (mem_path) {
#ifdef __linux__
Error *err = NULL;
memory_region_init_ram_from_file(mr, owner, name, ram_size, false,
mem_path, &err);
/* Legacy behavior: if allocation failed, fall back to
* regular RAM allocation.
*/
if (err) {
qerror_report_err(err);
error_free(err);
memory_region_init_ram(mr, owner, name, ram_size);
}
#else
fprintf(stderr, "-mem-path not supported on this host\n");
exit(1);
#endif
} else {
memory_region_init_ram(mr, owner, name, ram_size);
}
vmstate_register_ram_global(mr);
}
void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
const char *name,
uint64_t ram_size)
{
uint64_t addr = 0;
int i;
if (nb_numa_nodes == 0 || !have_memdevs) {
allocate_system_memory_nonnuma(mr, owner, name, ram_size);
return;
}
memory_region_init(mr, owner, name, ram_size);
for (i = 0; i < MAX_NODES; i++) {
Error *local_err = NULL;
uint64_t size = numa_info[i].node_mem;
HostMemoryBackend *backend = numa_info[i].node_memdev;
if (!backend) {
continue;
}
MemoryRegion *seg = host_memory_backend_get_memory(backend, &local_err);
if (local_err) {
qerror_report_err(local_err);
exit(1);
}
memory_region_add_subregion(mr, addr, seg);
vmstate_register_ram_global(seg);
addr += size;
}
}
static int query_memdev(Object *obj, void *opaque)
{
MemdevList **list = opaque;
Error *err = NULL;
if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
MemdevList *m = g_malloc0(sizeof(*m));
m->value = g_malloc0(sizeof(*m->value));
m->value->size = object_property_get_int(obj, "size",
&err);
if (err) {
goto error;
}
m->value->merge = object_property_get_bool(obj, "merge",
&err);
if (err) {
goto error;
}
m->value->dump = object_property_get_bool(obj, "dump",
&err);
if (err) {
goto error;
}
m->value->prealloc = object_property_get_bool(obj,
"prealloc", &err);
if (err) {
goto error;
}
m->value->policy = object_property_get_enum(obj,
"policy",
HostMemPolicy_lookup,
&err);
if (err) {
goto error;
}
object_property_get_uint16List(obj, "host-nodes",
&m->value->host_nodes, &err);
if (err) {
goto error;
}
m->next = *list;
*list = m;
}
return 0;
error:
return -1;
}
MemdevList *qmp_query_memdev(Error **errp)
{
Object *obj;
MemdevList *list = NULL, *m;
obj = object_resolve_path("/objects", NULL);
if (obj == NULL) {
return NULL;
}
if (object_child_foreach(obj, query_memdev, &list) != 0) {
goto error;
}
return list;
error:
while (list) {
m = list;
list = list->next;
g_free(m->value);
g_free(m);
}
return NULL;
}