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Peter Anvin" , Dave Hansen , linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Sandipan Das , Daniel Sneddon , Jing Liu , Josh Poimboeuf , Wyes Karny , Borislav Petkov , Babu Moger , Pawan Gupta , Sean Christopherson , Jim Mattson , x86@kernel.org, Maxim Levitsky Subject: [PATCH 09/13] KVM: SVM: allow NMI window with vNMI Date: Thu, 17 Nov 2022 16:32:38 +0200 Message-Id: <20221117143242.102721-10-mlevitsk@redhat.com> In-Reply-To: <20221117143242.102721-1-mlevitsk@redhat.com> References: <20221117143242.102721-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749754343539263486?= X-GMAIL-MSGID: =?utf-8?q?1749754343539263486?= When the vNMI is enabled, the only case when the KVM will use an NMI window is when the vNMI injection is pending. In this case on next IRET/RSM/STGI, the injection has to be complete and a new NMI can be injected. Signed-off-by: Maxim Levitsky --- arch/x86/kvm/svm/svm.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index cfec4c98bb589b..eaa30f8ace518d 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2477,7 +2477,10 @@ static int iret_interception(struct kvm_vcpu *vcpu) struct vcpu_svm *svm = to_svm(vcpu); ++vcpu->stat.nmi_window_exits; - vcpu->arch.hflags |= HF_IRET_MASK; + + if (!is_vnmi_enabled(svm)) + vcpu->arch.hflags |= HF_IRET_MASK; + if (!sev_es_guest(vcpu->kvm)) { svm_clr_intercept(svm, INTERCEPT_IRET); svm->nmi_iret_rip = kvm_rip_read(vcpu); @@ -3735,9 +3738,6 @@ static void svm_enable_nmi_window(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); - if (is_vnmi_enabled(svm)) - return; - if ((vcpu->arch.hflags & (HF_NMI_MASK | HF_IRET_MASK)) == HF_NMI_MASK) return; /* IRET will cause a vm exit */ @@ -3751,9 +3751,14 @@ static void svm_enable_nmi_window(struct kvm_vcpu *vcpu) * Something prevents NMI from been injected. Single step over possible * problem (IRET or exception injection or interrupt shadow) */ - svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu); - svm->nmi_singlestep = true; - svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); + + if (is_vnmi_enabled(svm)) { + svm_set_intercept(svm, INTERCEPT_IRET); + } else { + svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu); + svm->nmi_singlestep = true; + svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); + } } static void svm_flush_tlb_current(struct kvm_vcpu *vcpu)