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KVM: Expose the architectural performance monitoring CPUID leaf 

Provide a CPUID leaf that describes the emulated PMU.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2011-11-10 14:57:28 +02:00 committed by Avi Kivity
parent fee84b079d
commit a6c06ed1a6
1 changed files with 29 additions and 1 deletions
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30
arch/x86/kvm/cpuid.c
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@ -327,6 +327,35 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
}
case 9:
break;
case 0xa: { /* Architectural Performance Monitoring */
struct x86_pmu_capability cap;
union cpuid10_eax eax;
union cpuid10_edx edx;
perf_get_x86_pmu_capability(&cap);
/*
* Only support guest architectural pmu on a host
* with architectural pmu.
*/
if (!cap.version)
memset(&cap, 0, sizeof(cap));
eax.split.version_id = min(cap.version, 2);
eax.split.num_counters = cap.num_counters_gp;
eax.split.bit_width = cap.bit_width_gp;
eax.split.mask_length = cap.events_mask_len;
edx.split.num_counters_fixed = cap.num_counters_fixed;
edx.split.bit_width_fixed = cap.bit_width_fixed;
edx.split.reserved = 0;
entry->eax = eax.full;
entry->ebx = cap.events_mask;
entry->ecx = 0;
entry->edx = edx.full;
break;
}
/* function 0xb has additional index. */
case 0xb: {
int i, level_type;
@ -427,7 +456,6 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
case 3: /* Processor serial number */
case 5: /* MONITOR/MWAIT */
case 6: /* Thermal management */
case 0xA: /* Architectural Performance Monitoring */
case 0x80000007: /* Advanced power management */
case 0xC0000002:
case 0xC0000003: