2 * NUMA parameter parsing routines
4 * Copyright (c) 2014 Fujitsu Ltd.
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "sysemu/sysemu.h"
26 #include "exec/cpu-common.h"
27 #include "qemu/bitmap.h"
29 #include "qemu/error-report.h"
30 #include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
31 #include "qapi-visit.h"
32 #include "qapi/opts-visitor.h"
33 #include "qapi/dealloc-visitor.h"
34 #include "qapi/qmp/qerror.h"
35 #include "hw/boards.h"
36 #include "sysemu/hostmem.h"
38 QemuOptsList qemu_numa_opts
= {
40 .implied_opt_name
= "type",
41 .head
= QTAILQ_HEAD_INITIALIZER(qemu_numa_opts
.head
),
42 .desc
= { { 0 } } /* validated with OptsVisitor */
45 static int have_memdevs
= -1;
47 static void numa_node_parse(NumaNodeOptions
*node
, QemuOpts
*opts
, Error
**errp
)
50 uint16List
*cpus
= NULL
;
52 if (node
->has_nodeid
) {
53 nodenr
= node
->nodeid
;
55 nodenr
= nb_numa_nodes
;
58 if (nodenr
>= MAX_NODES
) {
59 error_setg(errp
, "Max number of NUMA nodes reached: %"
64 for (cpus
= node
->cpus
; cpus
; cpus
= cpus
->next
) {
65 if (cpus
->value
> MAX_CPUMASK_BITS
) {
66 error_setg(errp
, "CPU number %" PRIu16
" is bigger than %d",
67 cpus
->value
, MAX_CPUMASK_BITS
);
70 bitmap_set(numa_info
[nodenr
].node_cpu
, cpus
->value
, 1);
73 if (node
->has_mem
&& node
->has_memdev
) {
74 error_setg(errp
, "qemu: cannot specify both mem= and memdev=\n");
78 if (have_memdevs
== -1) {
79 have_memdevs
= node
->has_memdev
;
81 if (node
->has_memdev
!= have_memdevs
) {
82 error_setg(errp
, "qemu: memdev option must be specified for either "
88 uint64_t mem_size
= node
->mem
;
89 const char *mem_str
= qemu_opt_get(opts
, "mem");
90 /* Fix up legacy suffix-less format */
91 if (g_ascii_isdigit(mem_str
[strlen(mem_str
) - 1])) {
94 numa_info
[nodenr
].node_mem
= mem_size
;
96 if (node
->has_memdev
) {
98 o
= object_resolve_path_type(node
->memdev
, TYPE_MEMORY_BACKEND
, NULL
);
100 error_setg(errp
, "memdev=%s is ambiguous", node
->memdev
);
105 numa_info
[nodenr
].node_mem
= object_property_get_int(o
, "size", NULL
);
106 numa_info
[nodenr
].node_memdev
= MEMORY_BACKEND(o
);
110 int numa_init_func(QemuOpts
*opts
, void *opaque
)
112 NumaOptions
*object
= NULL
;
116 OptsVisitor
*ov
= opts_visitor_new(opts
);
117 visit_type_NumaOptions(opts_get_visitor(ov
), &object
, NULL
, &err
);
118 opts_visitor_cleanup(ov
);
125 switch (object
->kind
) {
126 case NUMA_OPTIONS_KIND_NODE
:
127 numa_node_parse(object
->node
, opts
, &err
);
140 qerror_report_err(err
);
144 QapiDeallocVisitor
*dv
= qapi_dealloc_visitor_new();
145 visit_type_NumaOptions(qapi_dealloc_get_visitor(dv
),
146 &object
, NULL
, NULL
);
147 qapi_dealloc_visitor_cleanup(dv
);
153 void set_numa_nodes(void)
155 if (nb_numa_nodes
> 0) {
159 if (nb_numa_nodes
> MAX_NODES
) {
160 nb_numa_nodes
= MAX_NODES
;
163 /* If no memory size if given for any node, assume the default case
164 * and distribute the available memory equally across all nodes
166 for (i
= 0; i
< nb_numa_nodes
; i
++) {
167 if (numa_info
[i
].node_mem
!= 0) {
171 if (i
== nb_numa_nodes
) {
172 uint64_t usedmem
= 0;
174 /* On Linux, the each node's border has to be 8MB aligned,
175 * the final node gets the rest.
177 for (i
= 0; i
< nb_numa_nodes
- 1; i
++) {
178 numa_info
[i
].node_mem
= (ram_size
/ nb_numa_nodes
) &
180 usedmem
+= numa_info
[i
].node_mem
;
182 numa_info
[i
].node_mem
= ram_size
- usedmem
;
186 for (i
= 0; i
< nb_numa_nodes
; i
++) {
187 numa_total
+= numa_info
[i
].node_mem
;
189 if (numa_total
!= ram_size
) {
190 error_report("total memory for NUMA nodes (%" PRIu64
")"
191 " should equal RAM size (" RAM_ADDR_FMT
")",
192 numa_total
, ram_size
);
196 for (i
= 0; i
< nb_numa_nodes
; i
++) {
197 if (!bitmap_empty(numa_info
[i
].node_cpu
, MAX_CPUMASK_BITS
)) {
201 /* assigning the VCPUs round-robin is easier to implement, guest OSes
202 * must cope with this anyway, because there are BIOSes out there in
203 * real machines which also use this scheme.
205 if (i
== nb_numa_nodes
) {
206 for (i
= 0; i
< max_cpus
; i
++) {
207 set_bit(i
, numa_info
[i
% nb_numa_nodes
].node_cpu
);
213 void set_numa_modes(void)
219 for (i
= 0; i
< nb_numa_nodes
; i
++) {
220 if (test_bit(cpu
->cpu_index
, numa_info
[i
].node_cpu
)) {
227 static void allocate_system_memory_nonnuma(MemoryRegion
*mr
, Object
*owner
,
234 memory_region_init_ram_from_file(mr
, owner
, name
, ram_size
, false,
237 /* Legacy behavior: if allocation failed, fall back to
238 * regular RAM allocation.
240 if (!memory_region_size(mr
)) {
241 qerror_report_err(err
);
243 memory_region_init_ram(mr
, owner
, name
, ram_size
);
246 fprintf(stderr
, "-mem-path not supported on this host\n");
250 memory_region_init_ram(mr
, owner
, name
, ram_size
);
252 vmstate_register_ram_global(mr
);
255 void memory_region_allocate_system_memory(MemoryRegion
*mr
, Object
*owner
,
262 if (nb_numa_nodes
== 0 || !have_memdevs
) {
263 allocate_system_memory_nonnuma(mr
, owner
, name
, ram_size
);
267 memory_region_init(mr
, owner
, name
, ram_size
);
268 for (i
= 0; i
< MAX_NODES
; i
++) {
269 Error
*local_err
= NULL
;
270 uint64_t size
= numa_info
[i
].node_mem
;
271 HostMemoryBackend
*backend
= numa_info
[i
].node_memdev
;
275 MemoryRegion
*seg
= host_memory_backend_get_memory(backend
, &local_err
);
277 qerror_report_err(local_err
);
281 memory_region_add_subregion(mr
, addr
, seg
);
282 vmstate_register_ram_global(seg
);