Commit 2a7921b7 authored by Gleb Natapov's avatar Gleb Natapov Committed by Marcelo Tosatti
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KVM: VMX: restore MSR_IA32_DEBUGCTLMSR after VMEXIT 



MSR_IA32_DEBUGCTLMSR is zeroed on VMEXIT. Restore it to the correct
value.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 6024f1a4

arch/x86/kvm/vmx.c

+6 −0
Original line number Diff line number Diff line
@@ -6222,6 +6222,7 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) 
static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	unsigned long debugctlmsr;



	if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) {

		struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
@@ -6261,6 +6262,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) 
		vmx_set_interrupt_shadow(vcpu, 0);



	atomic_switch_perf_msrs(vmx);

	debugctlmsr = get_debugctlmsr();



	vmx->__launched = vmx->loaded_vmcs->launched;

	asm(
@@ -6362,6 +6364,10 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) 
#endif

	      );



	/* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */

	if (debugctlmsr)

		update_debugctlmsr(debugctlmsr);



#ifndef CONFIG_X86_64

	/*

	 * The sysexit path does not restore ds/es, so we must set them to