Commit 017cb99e authored by Andre Przywara's avatar Andre Przywara Committed by Avi Kivity
Browse files

KVM: SVM: use explicit 64bit storage for sysenter values 



Since AMD does not support sysenter in 64bit mode, the VMCB fields storing
the MSRs are truncated to 32bit upon VMRUN/#VMEXIT. So store the values
in a separate 64bit storage to avoid truncation.

[andre: fix amd->amd migration]

Signed-off-by: default avatarChristoph Egger <christoph.egger@amd.com>
Signed-off-by: default avatarAndre Przywara <andre.przywara@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e7333391

arch/x86/kvm/kvm_svm.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ struct vcpu_svm { 
	unsigned long vmcb_pa;

	struct svm_cpu_data *svm_data;

	uint64_t asid_generation;

	uint64_t sysenter_esp;

	uint64_t sysenter_eip;



	u64 next_rip;

arch/x86/kvm/svm.c

+4 −4
Original line number Diff line number Diff line
@@ -367,8 +367,6 @@ static void svm_vcpu_init_msrpm(u32 *msrpm) 
#endif

	set_msr_interception(msrpm, MSR_K6_STAR, 1, 1);

	set_msr_interception(msrpm, MSR_IA32_SYSENTER_CS, 1, 1);

	set_msr_interception(msrpm, MSR_IA32_SYSENTER_ESP, 1, 1);

	set_msr_interception(msrpm, MSR_IA32_SYSENTER_EIP, 1, 1);

}



static void svm_enable_lbrv(struct vcpu_svm *svm)
@@ -1981,10 +1979,10 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) 
		*data = svm->vmcb->save.sysenter_cs;

		break;

	case MSR_IA32_SYSENTER_EIP:

		*data = svm->vmcb->save.sysenter_eip;

		*data = svm->sysenter_eip;

		break;

	case MSR_IA32_SYSENTER_ESP:

		*data = svm->vmcb->save.sysenter_esp;

		*data = svm->sysenter_esp;

		break;

	/* Nobody will change the following 5 values in the VMCB so

	   we can safely return them on rdmsr. They will always be 0
@@ -2071,9 +2069,11 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) 
		svm->vmcb->save.sysenter_cs = data;

		break;

	case MSR_IA32_SYSENTER_EIP:

		svm->sysenter_eip = data;

		svm->vmcb->save.sysenter_eip = data;

		break;

	case MSR_IA32_SYSENTER_ESP:

		svm->sysenter_esp = data;

		svm->vmcb->save.sysenter_esp = data;

		break;

	case MSR_IA32_DEBUGCTLMSR:

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