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qmp: add filtering of statistics by target vCPU

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Introduce a simple filtering of statistics, that allows to retrieve
statistics for a subset of the guest vCPUs.  This will be used for
example by the HMP monitor, in order to retrieve the statistics
for the currently selected CPU.

Example:
{ "execute": "query-stats",
  "arguments": {
    "target": "vcpu",
    "vcpus": [ "/machine/unattached/device[2]",
               "/machine/unattached/device[4]" ] } }

Extracted from a patch by Mark Kanda.

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-04-26 14:59:44 +02:00
parent cc01a3f4ca
commit 467ef823d8
4 changed files with 69 additions and 9 deletions
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9
accel/kvm/kvm-all.c
View file

@ -2311,7 +2311,8 @@ 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_cb(StatsResultList **result, StatsTarget target,
strList *targets, Error **errp);
static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
static int kvm_init(MachineState *ms)
@ -4038,7 +4039,8 @@ static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
close(stats_fd);
}
static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp)
static void query_stats_cb(StatsResultList **result, StatsTarget target,
strList *targets, Error **errp)
{
KVMState *s = kvm_state;
CPUState *cpu;
@ -4062,6 +4064,9 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target, Error *
stats_args.result.stats = result;
stats_args.errp = errp;
CPU_FOREACH(cpu) {
if (!apply_str_list_filter(cpu->parent_obj.canonical_path, targets)) {
continue;
}
run_on_cpu(cpu, query_stats_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
}
break;