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Mon, 14 Sep 2020 20:17:11 +0000 From: Tom Lendacky To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: Paolo Bonzini , Jim Mattson , Joerg Roedel , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Borislav Petkov , Ingo Molnar , Thomas Gleixner , Brijesh Singh Subject: [RFC PATCH 09/35] KVM: SVM: Do not emulate MMIO under SEV-ES Date: Mon, 14 Sep 2020 15:15:23 -0500 Message-Id: X-Mailer: git-send-email 2.28.0 In-Reply-To: References: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DM6PR13CA0006.namprd13.prod.outlook.com (2603:10b6:5:bc::19) To DM5PR12MB1355.namprd12.prod.outlook.com (2603:10b6:3:6e::7) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from tlendack-t1.amd.com (165.204.77.1) by DM6PR13CA0006.namprd13.prod.outlook.com (2603:10b6:5:bc::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3391.4 via Frontend Transport; Mon, 14 Sep 2020 20:17:10 +0000 X-Mailer: git-send-email 2.28.0 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: e46faa4a-4805-4088-1476-08d858eb297a X-MS-TrafficTypeDiagnostic: DM5PR12MB1163: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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Add support to prevent trying to perform MMIO emulation. Signed-off-by: Tom Lendacky --- arch/x86/kvm/mmu/mmu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a5d0207e7189..2e1b8b876286 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5485,6 +5485,13 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code, if (!mmio_info_in_cache(vcpu, cr2_or_gpa, direct) && !is_guest_mode(vcpu)) emulation_type |= EMULTYPE_ALLOW_RETRY_PF; emulate: + /* + * When the guest is an SEV-ES guest, emulation is not possible. Allow + * the guest to handle the MMIO emulation. + */ + if (vcpu->arch.vmsa_encrypted) + return 1; + /* * On AMD platforms, under certain conditions insn_len may be zero on #NPF. * This can happen if a guest gets a page-fault on data access but the HW -- 2.28.0