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Subject[PATCHv2 7/9] KVM: Expose the architectural performance monitoring CPUID leaf
Date
Provide a CPUID leaf that describes the emulated PMU.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/x86/kvm/x86.c | 23 ++++++++++++++++++++++-
1 files changed, 22 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b88426c..3c9c8c9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2544,6 +2544,28 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
}
case 9:
break;
+ case 0xa: { /* Architectural Performance Monitoring */
+ struct x86_pmu_capability cap;
+
+ 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));
+
+ entry->eax = min(cap.version, 2)
+ | (cap.num_counters_gp << 8)
+ | (cap.bit_width_gp << 16)
+ | (cap.events_mask_len << 24);
+ entry->ebx = cap.events_mask;
+ entry->ecx = 0;
+ entry->edx = cap.num_counters_fixed
+ | (cap.bit_width_fixed << 5);
+ break;
+ }
/* function 0xb has additional index. */
case 0xb: {
int i, level_type;
@@ -2638,7 +2660,6 @@ static void 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:
--
1.7.5.3


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