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Commit a6c06ed1 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: Expose the architectural performance monitoring CPUID leaf 



Provide a CPUID leaf that describes the emulated PMU.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent fee84b07

arch/x86/kvm/cpuid.c

+29 −1
Original line number Diff line number Diff line
@@ -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: