From a6c06ed1a60aff77b27ba558c315c3fed4e35565 Mon Sep 17 00:00:00 2001
From: Gleb Natapov <gleb@redhat.com>
Date: Thu, 10 Nov 2011 14:57:28 +0200
Subject: [PATCH] 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>
---
arch/x86/kvm/cpuid.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
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:
--
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