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Commit d7cd9796 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: VMX: Add support for guest/host-only profiling



Support guest/host-only profiling by switch perf msrs on
a guest entry if needed.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 8bf00a52
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+21 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@
#include <asm/mce.h>
#include <asm/i387.h>
#include <asm/xcr.h>
#include <asm/perf_event.h>

#include "trace.h"

@@ -6050,6 +6051,24 @@ static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
}

static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
{
	int i, nr_msrs;
	struct perf_guest_switch_msr *msrs;

	msrs = perf_guest_get_msrs(&nr_msrs);

	if (!msrs)
		return;

	for (i = 0; i < nr_msrs; i++)
		if (msrs[i].host == msrs[i].guest)
			clear_atomic_switch_msr(vmx, msrs[i].msr);
		else
			add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
					msrs[i].host);
}

#ifdef CONFIG_X86_64
#define R "r"
#define Q "q"
@@ -6099,6 +6118,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
		vmx_set_interrupt_shadow(vcpu, 0);

	atomic_switch_perf_msrs(vmx);

	vmx->__launched = vmx->loaded_vmcs->launched;
	asm(
		/* Store host registers */