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KVM: SVM: Do not install #UD intercept when SEV is enabled
On #UD, x86_emulate_instruction() fetches the data from guest memory and decodes the instruction bytes to assist further. When SEV is enabled, the instruction bytes will be encrypted using the guest-specific key and the hypervisor will no longer able to fetch the instruction bytes to assist UD handling. By not installing intercept we let the guest receive and handle #UD. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Borislav Petkov <bp@suse.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Borislav Petkov <bp@suse.de> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
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@ -1443,8 +1443,10 @@ static void init_vmcb(struct vcpu_svm *svm)
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svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
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svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
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}
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}
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if (sev_guest(svm->vcpu.kvm))
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if (sev_guest(svm->vcpu.kvm)) {
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svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
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svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
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clr_exception_intercept(svm, UD_VECTOR);
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}
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mark_all_dirty(svm->vmcb);
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mark_all_dirty(svm->vmcb);
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