From: Maxim Levitsky <mlevitsk@xxxxxxxxxx> commit dad1613e0533b380318281c1519e1a3477c2d0d2 upstream. 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@xxxxxxxxxxxxxxx Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx> Link: https://lore.kernel.org/r/20240802151608.72896-3-mlevitsk@xxxxxxxxxx Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kvm/svm/svm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2863,6 +2863,12 @@ static int svm_get_msr(struct kvm_vcpu * 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; @@ -3088,6 +3094,12 @@ static int svm_set_msr(struct kvm_vcpu * 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; Patches currently in stable-queue which might be from mlevitsk@xxxxxxxxxx are queue-6.10/kvm-svm-fix-emulation-of-msr-reads-writes-of-msr_fs_base-and-msr_gs_base.patch
