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cpu_x86: Probe TSC frequency and scaling support

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When the host CPU supports invariant TSC the host CPU definition created
by virCPUx86GetHost will contain (unless probing fails for some reason)
addition TSC related data.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Jiri Denemark 2019-05-30 21:47:38 +02:00
parent 32f577ab10
commit ceb04d15e6
1 changed files with 9 additions and 0 deletions
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9
src/cpu/cpu_x86.c
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@ -2762,6 +2762,15 @@ virCPUx86GetHost(virCPUDefPtr cpu,
ret = x86DecodeCPUData(cpu, cpuData, models);
cpu->microcodeVersion = virHostCPUGetMicrocodeVersion();
/* Probing for TSC frequency makes sense only if the CPU supports
* invariant TSC (Linux calls this constant_tsc in /proc/cpuinfo). */
if (virCPUx86DataCheckFeature(cpuData, "invtsc") == 1) {
VIR_DEBUG("Checking invariant TSC frequency");
cpu->tsc = virHostCPUGetTscInfo();
} else {
VIR_DEBUG("Host CPU does not support invariant TSC");
}
cleanup:
virCPUx86DataFree(cpuData);
return ret;