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Tue, 8 Jun 2021 18:06:17 +0000 From: Ashish Kalra To: pbonzini@redhat.com Cc: seanjc@google.com, tglx@linutronix.de, bp@alien8.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, Thomas.Lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, srutherford@google.com, brijesh.singh@amd.com, linux-efi@vger.kernel.org Subject: [PATCH v3 2/5] KVM: x86: invert KVM_HYPERCALL to default to VMMCALL Date: Tue, 8 Jun 2021 18:06:04 +0000 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SA0PR11CA0046.namprd11.prod.outlook.com (2603:10b6:806:d0::21) To BYAPR12MB2759.namprd12.prod.outlook.com (2603:10b6:a03:61::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ashkalra_ubuntu_server.amd.com (165.204.77.1) by SA0PR11CA0046.namprd11.prod.outlook.com (2603:10b6:806:d0::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.20 via Frontend Transport; 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If a hypercall is made before apply_alternative() is called then it defaults to VMCALL. The approach works fine on non SEV guest. A VMCALL would causes #UD, and hypervisor will be able to decode the instruction and do the right things. But when SEV is active, guest memory is encrypted with guest key and hypervisor will not be able to decode the instruction bytes. So invert KVM_HYPERCALL and X86_FEATURE_VMMCALL to default to VMMCALL and opt into VMCALL. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra --- arch/x86/include/asm/kvm_para.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 69299878b200..0267bebb0b0f 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -17,7 +17,7 @@ static inline bool kvm_check_and_clear_guest_paused(void) #endif /* CONFIG_KVM_GUEST */ #define KVM_HYPERCALL \ - ALTERNATIVE("vmcall", "vmmcall", X86_FEATURE_VMMCALL) + ALTERNATIVE("vmmcall", "vmcall", X86_FEATURE_VMCALL) /* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall * instruction. The hypervisor may replace it with something else but only the