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| author | Brijesh Singh <brijesh.singh@amd.com> | 2017-12-04 10:57:39 -0600 |
|---|---|---|
| committer | Brijesh Singh <brijesh.singh@amd.com> | 2017-12-04 13:33:14 -0600 |
| commit | 35c6f649bbb2e3f367116307273f998f0bf3e08e (patch) | |
| tree | ca3d29f68afa69e1727de95812232eb82f855628 /arch/x86/kvm/svm.c | |
| parent | 0ede79e1322479221fb0d0a7d2828d8ed033f060 (diff) | |
| download | lwn-35c6f649bbb2e3f367116307273f998f0bf3e08e.tar.gz lwn-35c6f649bbb2e3f367116307273f998f0bf3e08e.zip | |
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>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index f350e9bac9eb..3e848f952b4f 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1443,8 +1443,10 @@ static void init_vmcb(struct vcpu_svm *svm) svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK; } - if (sev_guest(svm->vcpu.kvm)) + if (sev_guest(svm->vcpu.kvm)) { svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE; + clr_exception_intercept(svm, UD_VECTOR); + } mark_all_dirty(svm->vmcb); |