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cpu_x86: Read CPU features from IA32_ARCH_CAPABILITIES MSR

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This is used by the host capabilities code to construct host CPU
definition.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Jiri Denemark 2019-03-22 16:52:21 +01:00
parent bcfed7f1c8
commit 56b254dccc
1 changed files with 22 additions and 0 deletions
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22
src/cpu/cpu_x86.c
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@ -2773,6 +2773,28 @@ virCPUx86GetHost(virCPUDefPtr cpu,
cpuidSet(CPUX86_EXTENDED, cpuData) < 0)
goto cleanup;
/* Read the IA32_ARCH_CAPABILITIES MSR (0x10a) if supported.
* This is best effort since there might be no way to read the MSR
* when we are not running as root. */
if (virCPUx86DataCheckFeature(cpuData, "arch-capabilities") == 1) {
uint64_t msr;
unsigned long index = 0x10a;
if (virHostCPUGetMSR(index, &msr) == 0) {
virCPUx86DataItem item = {
.type = VIR_CPU_X86_DATA_MSR,
.data.msr = {
.index = index,
.eax = msr & 0xffffffff,
.edx = msr >> 32,
},
};
if (virCPUx86DataAdd(cpuData, &item) < 0)
return -1;
}
}
ret = x86DecodeCPUData(cpu, cpuData, models);
cpu->microcodeVersion = virHostCPUGetMicrocodeVersion();