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KVM: SVM: fix emulation of msr reads/writes of MSR_FS_BASE and MSR_GS_BASE

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If these msrs are read by the emulator (e.g due to 'force emulation' prefix),
SVM code currently fails to extract the corresponding segment bases,
and return them to the emulator.

Fix that.

Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20240802151608.72896-3-mlevitsk@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Maxim Levitsky
2024-08-02 18:16:08 +03:00
committed by Sean Christopherson
parent 4bcdd831d9
commit dad1613e05
1 changed files with 12 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/x86/kvm/svm/svm.c
+12
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@@ -2876,6 +2876,12 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
case MSR_CSTAR:
msr_info->data = svm->vmcb01.ptr->save.cstar;
break;
case MSR_GS_BASE:
msr_info->data = svm->vmcb01.ptr->save.gs.base;
break;
case MSR_FS_BASE:
msr_info->data = svm->vmcb01.ptr->save.fs.base;
break;
case MSR_KERNEL_GS_BASE:
msr_info->data = svm->vmcb01.ptr->save.kernel_gs_base;
break;
@@ -3101,6 +3107,12 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
case MSR_CSTAR:
svm->vmcb01.ptr->save.cstar = data;
break;
case MSR_GS_BASE:
svm->vmcb01.ptr->save.gs.base = data;
break;
case MSR_FS_BASE:
svm->vmcb01.ptr->save.fs.base = data;
break;
case MSR_KERNEL_GS_BASE:
svm->vmcb01.ptr->save.kernel_gs_base = data;
break;