diff options
| -rw-r--r-- | hw/acpi/aml-build.c | 26 | ||||
| -rw-r--r-- | hw/i386/acpi-build.c | 4 | ||||
| -rw-r--r-- | include/hw/acpi/aml-build.h | 1 | ||||
| -rw-r--r-- | include/sysemu/numa.h | 2 | ||||
| -rw-r--r-- | include/sysemu/sysemu.h | 4 | ||||
| -rw-r--r-- | numa.c | 137 | ||||
| -rw-r--r-- | qapi-schema.json | 30 | ||||
| -rw-r--r-- | qemu-options.hx | 16 |
8 files changed, 215 insertions, 5 deletions
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c index c6f2032..be496c8 100644 --- a/hw/acpi/aml-build.c +++ b/hw/acpi/aml-build.c @@ -24,6 +24,7 @@ #include "hw/acpi/aml-build.h" #include "qemu/bswap.h" #include "qemu/bitops.h" +#include "sysemu/numa.h" static GArray *build_alloc_array(void) { @@ -1609,3 +1610,28 @@ void build_srat_memory(AcpiSratMemoryAffinity *numamem, uint64_t base, numamem->base_addr = cpu_to_le64(base); numamem->range_length = cpu_to_le64(len); } + +/* + * ACPI spec 5.2.17 System Locality Distance Information Table + * (Revision 2.0 or later) + */ +void build_slit(GArray *table_data, BIOSLinker *linker) +{ + int slit_start, i, j; + slit_start = table_data->len; + + acpi_data_push(table_data, sizeof(AcpiTableHeader)); + + build_append_int_noprefix(table_data, nb_numa_nodes, 8); + for (i = 0; i < nb_numa_nodes; i++) { + for (j = 0; j < nb_numa_nodes; j++) { + assert(numa_info[i].distance[j]); + build_append_int_noprefix(table_data, numa_info[i].distance[j], 1); + } + } + + build_header(linker, table_data, + (void *)(table_data->data + slit_start), + "SLIT", + table_data->len - slit_start, 1, NULL, NULL); +} diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 1d8c645..c7cc45c 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -2707,6 +2707,10 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine) if (pcms->numa_nodes) { acpi_add_table(table_offsets, tables_blob); build_srat(tables_blob, tables->linker, machine); + if (have_numa_distance) { + acpi_add_table(table_offsets, tables_blob); + build_slit(tables_blob, tables->linker); + } } if (acpi_get_mcfg(&mcfg)) { acpi_add_table(table_offsets, tables_blob); diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h index 00c21f1..329a0d0 100644 --- a/include/hw/acpi/aml-build.h +++ b/include/hw/acpi/aml-build.h @@ -389,4 +389,5 @@ GCC_FMT_ATTR(2, 3); void build_srat_memory(AcpiSratMemoryAffinity *numamem, uint64_t base, uint64_t len, int node, MemoryAffinityFlags flags); +void build_slit(GArray *table_data, BIOSLinker *linker); #endif diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h index 8f09dcf..0ea1bc0 100644 --- a/include/sysemu/numa.h +++ b/include/sysemu/numa.h @@ -8,6 +8,7 @@ #include "hw/boards.h" extern int nb_numa_nodes; /* Number of NUMA nodes */ +extern bool have_numa_distance; struct numa_addr_range { ram_addr_t mem_start; @@ -21,6 +22,7 @@ typedef struct node_info { struct HostMemoryBackend *node_memdev; bool present; QLIST_HEAD(, numa_addr_range) addr; /* List to store address ranges */ + uint8_t distance[MAX_NODES]; } NodeInfo; extern NodeInfo numa_info[MAX_NODES]; diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 15656b7..be9e22c 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -166,6 +166,10 @@ extern int mem_prealloc; #define MAX_NODES 128 #define NUMA_NODE_UNASSIGNED MAX_NODES +#define NUMA_DISTANCE_MIN 10 +#define NUMA_DISTANCE_DEFAULT 20 +#define NUMA_DISTANCE_MAX 254 +#define NUMA_DISTANCE_UNREACHABLE 255 #define MAX_OPTION_ROMS 16 typedef struct QEMUOptionRom { @@ -51,6 +51,7 @@ static int max_numa_nodeid; /* Highest specified NUMA node ID, plus one. * For all nodes, nodeid < max_numa_nodeid */ int nb_numa_nodes; +bool have_numa_distance; NodeInfo numa_info[MAX_NODES]; void numa_set_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node) @@ -140,7 +141,7 @@ uint32_t numa_get_node(ram_addr_t addr, Error **errp) return -1; } -static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp) +static void parse_numa_node(NumaNodeOptions *node, QemuOpts *opts, Error **errp) { uint16_t nodenr; uint16List *cpus = NULL; @@ -212,6 +213,43 @@ static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp) max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1); } +static void parse_numa_distance(NumaDistOptions *dist, Error **errp) +{ + uint16_t src = dist->src; + uint16_t dst = dist->dst; + uint8_t val = dist->val; + + if (src >= MAX_NODES || dst >= MAX_NODES) { + error_setg(errp, + "Invalid node %" PRIu16 + ", max possible could be %" PRIu16, + MAX(src, dst), MAX_NODES); + return; + } + + if (!numa_info[src].present || !numa_info[dst].present) { + error_setg(errp, "Source/Destination NUMA node is missing. " + "Please use '-numa node' option to declare it first."); + return; + } + + if (val < NUMA_DISTANCE_MIN) { + error_setg(errp, "NUMA distance (%" PRIu8 ") is invalid, " + "it shouldn't be less than %d.", + val, NUMA_DISTANCE_MIN); + return; + } + + if (src == dst && val != NUMA_DISTANCE_MIN) { + error_setg(errp, "Local distance of node %d should be %d.", + src, NUMA_DISTANCE_MIN); + return; + } + + numa_info[src].distance[dst] = val; + have_numa_distance = true; +} + static int parse_numa(void *opaque, QemuOpts *opts, Error **errp) { NumaOptions *object = NULL; @@ -229,12 +267,18 @@ static int parse_numa(void *opaque, QemuOpts *opts, Error **errp) switch (object->type) { case NUMA_OPTIONS_TYPE_NODE: - numa_node_parse(&object->u.node, opts, &err); + parse_numa_node(&object->u.node, opts, &err); if (err) { goto end; } nb_numa_nodes++; break; + case NUMA_OPTIONS_TYPE_DIST: + parse_numa_distance(&object->u.dist, &err); + if (err) { + goto end; + } + break; default: abort(); } @@ -294,6 +338,75 @@ static void validate_numa_cpus(void) g_free(seen_cpus); } +/* If all node pair distances are symmetric, then only distances + * in one direction are enough. If there is even one asymmetric + * pair, though, then all distances must be provided. The + * distance from a node to itself is always NUMA_DISTANCE_MIN, + * so providing it is never necessary. + */ +static void validate_numa_distance(void) +{ + int src, dst; + bool is_asymmetrical = false; + + for (src = 0; src < nb_numa_nodes; src++) { + for (dst = src; dst < nb_numa_nodes; dst++) { + if (numa_info[src].distance[dst] == 0 && + numa_info[dst].distance[src] == 0) { + if (src != dst) { + error_report("The distance between node %d and %d is " + "missing, at least one distance value " + "between each nodes should be provided.", + src, dst); + exit(EXIT_FAILURE); + } + } + + if (numa_info[src].distance[dst] != 0 && + numa_info[dst].distance[src] != 0 && + numa_info[src].distance[dst] != + numa_info[dst].distance[src]) { + is_asymmetrical = true; + } + } + } + + if (is_asymmetrical) { + for (src = 0; src < nb_numa_nodes; src++) { + for (dst = 0; dst < nb_numa_nodes; dst++) { + if (src != dst && numa_info[src].distance[dst] == 0) { + error_report("At least one asymmetrical pair of " + "distances is given, please provide distances " + "for both directions of all node pairs."); + exit(EXIT_FAILURE); + } + } + } + } +} + +static void complete_init_numa_distance(void) +{ + int src, dst; + + /* Fixup NUMA distance by symmetric policy because if it is an + * asymmetric distance table, it should be a complete table and + * there would not be any missing distance except local node, which + * is verified by validate_numa_distance above. + */ + for (src = 0; src < nb_numa_nodes; src++) { + for (dst = 0; dst < nb_numa_nodes; dst++) { + if (numa_info[src].distance[dst] == 0) { + if (src == dst) { + numa_info[src].distance[dst] = NUMA_DISTANCE_MIN; + } else { + numa_info[src].distance[dst] = numa_info[dst].distance[src]; + } + } + } + } +} + void parse_numa_opts(MachineClass *mc) { int i; @@ -390,6 +503,26 @@ void parse_numa_opts(MachineClass *mc) } validate_numa_cpus(); + + /* QEMU needs at least all unique node pair distances to build + * the whole NUMA distance table. QEMU treats the distance table + * as symmetric by default, i.e. distance A->B == distance B->A. + * Thus, QEMU is able to complete the distance table + * initialization even though only distance A->B is provided and + * distance B->A is not. QEMU knows the distance of a node to + * itself is always 10, so A->A distances may be omitted. When + * the distances of two nodes of a pair differ, i.e. distance + * A->B != distance B->A, then that means the distance table is + * asymmetric. In this case, the distances for both directions + * of all node pairs are required. + */ + if (have_numa_distance) { + /* Validate enough NUMA distance information was provided. */ + validate_numa_distance(); + + /* Validation succeeded, now fill in any missing distances. */ + complete_init_numa_distance(); + } } else { numa_set_mem_node_id(0, ram_size, 0); } diff --git a/qapi-schema.json b/qapi-schema.json index 5728b7f..f4eef33 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -5682,10 +5682,14 @@ ## # @NumaOptionsType: # +# @node: NUMA nodes configuration +# +# @dist: NUMA distance configuration (since 2.10) +# # Since: 2.1 ## { 'enum': 'NumaOptionsType', - 'data': [ 'node' ] } + 'data': [ 'node', 'dist' ] } ## # @NumaOptions: @@ -5698,7 +5702,8 @@ 'base': { 'type': 'NumaOptionsType' }, 'discriminator': 'type', 'data': { - 'node': 'NumaNodeOptions' }} + 'node': 'NumaNodeOptions', + 'dist': 'NumaDistOptions' }} ## # @NumaNodeOptions: @@ -5727,6 +5732,27 @@ '*memdev': 'str' }} ## +# @NumaDistOptions: +# +# Set the distance between 2 NUMA nodes. +# +# @src: source NUMA node. +# +# @dst: destination NUMA node. +# +# @val: NUMA distance from source node to destination node. +# When a node is unreachable from another node, set the distance +# between them to 255. +# +# Since: 2.10 +## +{ 'struct': 'NumaDistOptions', + 'data': { + 'src': 'uint16', + 'dst': 'uint16', + 'val': 'uint8' }} + +## # @HostMemPolicy: # # Host memory policy types diff --git a/qemu-options.hx b/qemu-options.hx index 70c0ded..e10c145 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -139,12 +139,15 @@ ETEXI DEF("numa", HAS_ARG, QEMU_OPTION_numa, "-numa node[,mem=size][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n" - "-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n", QEMU_ARCH_ALL) + "-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n" + "-numa dist,src=source,dst=destination,val=distance\n", QEMU_ARCH_ALL) STEXI @item -numa node[,mem=@var{size}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}] @itemx -numa node[,memdev=@var{id}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}] +@itemx -numa dist,src=@var{source},dst=@var{destination},val=@var{distance} @findex -numa Define a NUMA node and assign RAM and VCPUs to it. +Set the NUMA distance from a source node to a destination node. @var{firstcpu} and @var{lastcpu} are CPU indexes. Each @samp{cpus} option represent a contiguous range of CPU indexes @@ -167,6 +170,17 @@ split equally between them. @samp{mem} and @samp{memdev} are mutually exclusive. Furthermore, if one node uses @samp{memdev}, all of them have to use it. +@var{source} and @var{destination} are NUMA node IDs. +@var{distance} is the NUMA distance from @var{source} to @var{destination}. +The distance from a node to itself is always 10. If any pair of nodes is +given a distance, then all pairs must be given distances. Although, when +distances are only given in one direction for each pair of nodes, then +the distances in the opposite directions are assumed to be the same. If, +however, an asymmetrical pair of distances is given for even one node +pair, then all node pairs must be provided distance values for both +directions, even when they are symmetrical. When a node is unreachable +from another node, set the pair's distance to 255. + Note that the -@option{numa} option doesn't allocate any of the specified resources, it just assigns existing resources to NUMA nodes. This means that one still has to use the @option{-m}, |