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| author | Gleb Natapov <gleb@redhat.com> | 2011-11-10 14:57:28 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-12-27 11:24:40 +0200 |
| commit | a6c06ed1a60aff77b27ba558c315c3fed4e35565 (patch) | |
| tree | 1b2ad5c195928a5408b0fb5c02aaea5c1e975675 /arch/x86/kvm/cpuid.c | |
| parent | fee84b079d5ddee2247b5c1f53162c330c622902 (diff) | |
| download | lwn-a6c06ed1a60aff77b27ba558c315c3fed4e35565.tar.gz lwn-a6c06ed1a60aff77b27ba558c315c3fed4e35565.zip | |
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>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index e70be46f50fc..89b02bfaaca5 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -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: |