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KVM: VMX: Add support for guest/host-only profiling

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

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov
2011-10-05 14:01:23 +02:00
committed by Avi Kivity
parent 8bf00a5299
commit d7cd97964b
1 changed files with 21 additions and 0 deletions
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21
arch/x86/kvm/vmx.c
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@@ -39,6 +39,7 @@
#include <asm/mce.h> #include <asm/mce.h>
#include <asm/i387.h> #include <asm/i387.h>
#include <asm/xcr.h> #include <asm/xcr.h>
#include <asm/perf_event.h>
#include "trace.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); 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 #ifdef CONFIG_X86_64
#define R "r" #define R "r"
#define Q "q" #define Q "q"
@@ -6099,6 +6118,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
vmx_set_interrupt_shadow(vcpu, 0); vmx_set_interrupt_shadow(vcpu, 0);
atomic_switch_perf_msrs(vmx);
vmx->__launched = vmx->loaded_vmcs->launched; vmx->__launched = vmx->loaded_vmcs->launched;
asm( asm(
/* Store host registers */ /* Store host registers */