diff options
Diffstat (limited to 'accel')
| -rw-r--r-- | accel/kvm/kvm-all.c | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index a4c4863f53..7cc9e33bab 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -47,6 +47,7 @@ #include "kvm-cpus.h" #include "hw/boards.h" +#include "monitor/stats.h" /* This check must be after config-host.h is included */ #ifdef CONFIG_EVENTFD @@ -2310,6 +2311,9 @@ bool kvm_dirty_ring_enabled(void) return kvm_state->kvm_dirty_ring_size ? true : false; } +static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp); +static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp); + static int kvm_init(MachineState *ms) { MachineClass *mc = MACHINE_GET_CLASS(ms); @@ -2638,6 +2642,10 @@ static int kvm_init(MachineState *ms) } } + if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) { + add_stats_callbacks(query_stats_cb, query_stats_schemas_cb); + } + return 0; err: @@ -3697,3 +3705,387 @@ static void kvm_type_init(void) } type_init(kvm_type_init); + +typedef struct StatsArgs { + union StatsResultsType { + StatsResultList **stats; + StatsSchemaList **schema; + } result; + Error **errp; +} StatsArgs; + +static StatsList *add_kvmstat_entry(struct kvm_stats_desc *pdesc, + uint64_t *stats_data, + StatsList *stats_list, + Error **errp) +{ + + Stats *stats; + uint64List *val_list = NULL; + + /* Only add stats that we understand. */ + switch (pdesc->flags & KVM_STATS_TYPE_MASK) { + case KVM_STATS_TYPE_CUMULATIVE: + case KVM_STATS_TYPE_INSTANT: + case KVM_STATS_TYPE_PEAK: + case KVM_STATS_TYPE_LINEAR_HIST: + case KVM_STATS_TYPE_LOG_HIST: + break; + default: + return stats_list; + } + + switch (pdesc->flags & KVM_STATS_UNIT_MASK) { + case KVM_STATS_UNIT_NONE: + case KVM_STATS_UNIT_BYTES: + case KVM_STATS_UNIT_CYCLES: + case KVM_STATS_UNIT_SECONDS: + break; + default: + return stats_list; + } + + switch (pdesc->flags & KVM_STATS_BASE_MASK) { + case KVM_STATS_BASE_POW10: + case KVM_STATS_BASE_POW2: + break; + default: + return stats_list; + } + + /* Alloc and populate data list */ + stats = g_new0(Stats, 1); + stats->name = g_strdup(pdesc->name); + stats->value = g_new0(StatsValue, 1);; + + if (pdesc->size == 1) { + stats->value->u.scalar = *stats_data; + stats->value->type = QTYPE_QNUM; + } else { + int i; + for (i = 0; i < pdesc->size; i++) { + QAPI_LIST_PREPEND(val_list, stats_data[i]); + } + stats->value->u.list = val_list; + stats->value->type = QTYPE_QLIST; + } + + QAPI_LIST_PREPEND(stats_list, stats); + return stats_list; +} + +static StatsSchemaValueList *add_kvmschema_entry(struct kvm_stats_desc *pdesc, + StatsSchemaValueList *list, + Error **errp) +{ + StatsSchemaValueList *schema_entry = g_new0(StatsSchemaValueList, 1); + schema_entry->value = g_new0(StatsSchemaValue, 1); + + switch (pdesc->flags & KVM_STATS_TYPE_MASK) { + case KVM_STATS_TYPE_CUMULATIVE: + schema_entry->value->type = STATS_TYPE_CUMULATIVE; + break; + case KVM_STATS_TYPE_INSTANT: + schema_entry->value->type = STATS_TYPE_INSTANT; + break; + case KVM_STATS_TYPE_PEAK: + schema_entry->value->type = STATS_TYPE_PEAK; + break; + case KVM_STATS_TYPE_LINEAR_HIST: + schema_entry->value->type = STATS_TYPE_LINEAR_HISTOGRAM; + schema_entry->value->bucket_size = pdesc->bucket_size; + schema_entry->value->has_bucket_size = true; + break; + case KVM_STATS_TYPE_LOG_HIST: + schema_entry->value->type = STATS_TYPE_LOG2_HISTOGRAM; + break; + default: + goto exit; + } + + switch (pdesc->flags & KVM_STATS_UNIT_MASK) { + case KVM_STATS_UNIT_NONE: + break; + case KVM_STATS_UNIT_BYTES: + schema_entry->value->has_unit = true; + schema_entry->value->unit = STATS_UNIT_BYTES; + break; + case KVM_STATS_UNIT_CYCLES: + schema_entry->value->has_unit = true; + schema_entry->value->unit = STATS_UNIT_CYCLES; + break; + case KVM_STATS_UNIT_SECONDS: + schema_entry->value->has_unit = true; + schema_entry->value->unit = STATS_UNIT_SECONDS; + break; + default: + goto exit; + } + + schema_entry->value->exponent = pdesc->exponent; + if (pdesc->exponent) { + switch (pdesc->flags & KVM_STATS_BASE_MASK) { + case KVM_STATS_BASE_POW10: + schema_entry->value->has_base = true; + schema_entry->value->base = 10; + break; + case KVM_STATS_BASE_POW2: + schema_entry->value->has_base = true; + schema_entry->value->base = 2; + break; + default: + goto exit; + } + } + + schema_entry->value->name = g_strdup(pdesc->name); + schema_entry->next = list; + return schema_entry; +exit: + g_free(schema_entry->value); + g_free(schema_entry); + return list; +} + +/* Cached stats descriptors */ +typedef struct StatsDescriptors { + const char *ident; /* cache key, currently the StatsTarget */ + struct kvm_stats_desc *kvm_stats_desc; + struct kvm_stats_header *kvm_stats_header; + QTAILQ_ENTRY(StatsDescriptors) next; +} StatsDescriptors; + +static QTAILQ_HEAD(, StatsDescriptors) stats_descriptors = + QTAILQ_HEAD_INITIALIZER(stats_descriptors); + +/* + * Return the descriptors for 'target', that either have already been read + * or are retrieved from 'stats_fd'. + */ +static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd, + Error **errp) +{ + StatsDescriptors *descriptors; + const char *ident; + struct kvm_stats_desc *kvm_stats_desc; + struct kvm_stats_header *kvm_stats_header; + size_t size_desc; + ssize_t ret; + + ident = StatsTarget_str(target); + QTAILQ_FOREACH(descriptors, &stats_descriptors, next) { + if (g_str_equal(descriptors->ident, ident)) { + return descriptors; + } + } + + descriptors = g_new0(StatsDescriptors, 1); + + /* Read stats header */ + kvm_stats_header = g_malloc(sizeof(*kvm_stats_header)); + ret = read(stats_fd, kvm_stats_header, sizeof(*kvm_stats_header)); + if (ret != sizeof(*kvm_stats_header)) { + error_setg(errp, "KVM stats: failed to read stats header: " + "expected %zu actual %zu", + sizeof(*kvm_stats_header), ret); + return NULL; + } + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size; + + /* Read stats descriptors */ + kvm_stats_desc = g_malloc0_n(kvm_stats_header->num_desc, size_desc); + ret = pread(stats_fd, kvm_stats_desc, + size_desc * kvm_stats_header->num_desc, + kvm_stats_header->desc_offset); + + if (ret != size_desc * kvm_stats_header->num_desc) { + error_setg(errp, "KVM stats: failed to read stats descriptors: " + "expected %zu actual %zu", + size_desc * kvm_stats_header->num_desc, ret); + g_free(descriptors); + g_free(kvm_stats_desc); + return NULL; + } + descriptors->kvm_stats_header = kvm_stats_header; + descriptors->kvm_stats_desc = kvm_stats_desc; + descriptors->ident = ident; + QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next); + return descriptors; +} + +static void query_stats(StatsResultList **result, StatsTarget target, + int stats_fd, Error **errp) +{ + struct kvm_stats_desc *kvm_stats_desc; + struct kvm_stats_header *kvm_stats_header; + StatsDescriptors *descriptors; + g_autofree uint64_t *stats_data = NULL; + struct kvm_stats_desc *pdesc; + StatsList *stats_list = NULL; + size_t size_desc, size_data = 0; + ssize_t ret; + int i; + + descriptors = find_stats_descriptors(target, stats_fd, errp); + if (!descriptors) { + return; + } + + kvm_stats_header = descriptors->kvm_stats_header; + kvm_stats_desc = descriptors->kvm_stats_desc; + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size; + + /* Tally the total data size; read schema data */ + for (i = 0; i < kvm_stats_header->num_desc; ++i) { + pdesc = (void *)kvm_stats_desc + i * size_desc; + size_data += pdesc->size * sizeof(*stats_data); + } + + stats_data = g_malloc0(size_data); + ret = pread(stats_fd, stats_data, size_data, kvm_stats_header->data_offset); + + if (ret != size_data) { + error_setg(errp, "KVM stats: failed to read data: " + "expected %zu actual %zu", size_data, ret); + return; + } + + for (i = 0; i < kvm_stats_header->num_desc; ++i) { + uint64_t *stats; + pdesc = (void *)kvm_stats_desc + i * size_desc; + + /* Add entry to the list */ + stats = (void *)stats_data + pdesc->offset; + stats_list = add_kvmstat_entry(pdesc, stats, stats_list, errp); + } + + if (!stats_list) { + return; + } + + switch (target) { + case STATS_TARGET_VM: + add_stats_entry(result, STATS_PROVIDER_KVM, NULL, stats_list); + break; + case STATS_TARGET_VCPU: + add_stats_entry(result, STATS_PROVIDER_KVM, + current_cpu->parent_obj.canonical_path, + stats_list); + break; + default: + break; + } +} + +static void query_stats_schema(StatsSchemaList **result, StatsTarget target, + int stats_fd, Error **errp) +{ + struct kvm_stats_desc *kvm_stats_desc; + struct kvm_stats_header *kvm_stats_header; + StatsDescriptors *descriptors; + struct kvm_stats_desc *pdesc; + StatsSchemaValueList *stats_list = NULL; + size_t size_desc; + int i; + + descriptors = find_stats_descriptors(target, stats_fd, errp); + if (!descriptors) { + return; + } + + kvm_stats_header = descriptors->kvm_stats_header; + kvm_stats_desc = descriptors->kvm_stats_desc; + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size; + + /* Tally the total data size; read schema data */ + for (i = 0; i < kvm_stats_header->num_desc; ++i) { + pdesc = (void *)kvm_stats_desc + i * size_desc; + stats_list = add_kvmschema_entry(pdesc, stats_list, errp); + } + + add_stats_schema(result, STATS_PROVIDER_KVM, target, stats_list); +} + +static void query_stats_vcpu(CPUState *cpu, run_on_cpu_data data) +{ + StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr; + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL); + Error *local_err = NULL; + + if (stats_fd == -1) { + error_setg_errno(&local_err, errno, "KVM stats: ioctl failed"); + error_propagate(kvm_stats_args->errp, local_err); + return; + } + query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd, + kvm_stats_args->errp); + close(stats_fd); +} + +static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data) +{ + StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr; + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL); + Error *local_err = NULL; + + if (stats_fd == -1) { + error_setg_errno(&local_err, errno, "KVM stats: ioctl failed"); + error_propagate(kvm_stats_args->errp, local_err); + return; + } + query_stats_schema(kvm_stats_args->result.schema, STATS_TARGET_VCPU, stats_fd, + kvm_stats_args->errp); + close(stats_fd); +} + +static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp) +{ + KVMState *s = kvm_state; + CPUState *cpu; + int stats_fd; + + switch (target) { + case STATS_TARGET_VM: + { + stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL); + if (stats_fd == -1) { + error_setg_errno(errp, errno, "KVM stats: ioctl failed"); + return; + } + query_stats(result, target, stats_fd, errp); + close(stats_fd); + break; + } + case STATS_TARGET_VCPU: + { + StatsArgs stats_args; + stats_args.result.stats = result; + stats_args.errp = errp; + CPU_FOREACH(cpu) { + run_on_cpu(cpu, query_stats_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args)); + } + break; + } + default: + break; + } +} + +void query_stats_schemas_cb(StatsSchemaList **result, Error **errp) +{ + StatsArgs stats_args; + KVMState *s = kvm_state; + int stats_fd; + + stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL); + if (stats_fd == -1) { + error_setg_errno(errp, errno, "KVM stats: ioctl failed"); + return; + } + query_stats_schema(result, STATS_TARGET_VM, stats_fd, errp); + close(stats_fd); + + stats_args.result.schema = result; + stats_args.errp = errp; + run_on_cpu(first_cpu, query_stats_schema_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args)); +} |