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

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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: Christoph Egger <christoph.egger@amd.com>
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Andre Przywara 2009-05-28 11:56:31 +02:00 committed by Avi Kivity
parent e733339140
commit 017cb99e87
2 changed files with 6 additions and 4 deletions
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2
arch/x86/kvm/kvm_svm.h
View file

@ -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;

8
arch/x86/kvm/svm.c
View file

@ -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: