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Mon, 14 Sep 2020 20:17:50 +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 14/35] KVM: SVM: Add support for SEV-ES GHCB MSR protocol function 0x002 Date: Mon, 14 Sep 2020 15:15:28 -0500 Message-Id: <91ddbabb64a338c59bf5cbe554d537d0b72464d9.1600114548.git.thomas.lendacky@amd.com> 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: DM5PR16CA0023.namprd16.prod.outlook.com (2603:10b6:3:c0::33) 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 DM5PR16CA0023.namprd16.prod.outlook.com (2603:10b6:3:c0::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3370.16 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: b0943643-bbf7-4fe6-a4b9-08d858eb4091 X-MS-Exchange-CrossTenant-AuthSource: DM5PR12MB1355.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2020 20:17:49.9289 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 675UOxHuRmDnxopW65jTnmEfPk9rXNTrcsERKHeEu1TjvL19gHyTuM8KPTj3JvXHq5QZqX0lOtNpaQ0WfTTuPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1163 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Lendacky The GHCB defines a GHCB MSR protocol using the lower 12-bits of the GHCB MSR (in the hypervisor this corresponds to the GHCB GPA field in the VMCB). Function 0x002 is a request to set the GHCB MSR value to the SEV INFO as per the specification via the VMCB GHCB GPA field. Signed-off-by: Tom Lendacky --- arch/x86/kvm/svm/sev.c | 26 +++++++++++++++++++++++++- arch/x86/kvm/svm/svm.h | 17 +++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index f0fd89788de7..07082c752c76 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -20,6 +20,7 @@ #include "svm.h" #include "trace.h" +static u8 sev_enc_bit; static int sev_flush_asids(void); static DECLARE_RWSEM(sev_deactivate_lock); static DEFINE_MUTEX(sev_bitmap_lock); @@ -1130,6 +1131,9 @@ void __init sev_hardware_setup(void) /* Retrieve SEV CPUID information */ cpuid(0x8000001f, &eax, &ebx, &ecx, &edx); + /* Set encryption bit location for SEV-ES guests */ + sev_enc_bit = ebx & 0x3f; + /* Maximum number of encrypted guests supported simultaneously */ max_sev_asid = ecx; @@ -1219,9 +1223,29 @@ void pre_sev_run(struct vcpu_svm *svm, int cpu) vmcb_mark_dirty(svm->vmcb, VMCB_ASID); } +static void set_ghcb_msr(struct vcpu_svm *svm, u64 value) +{ + svm->vmcb->control.ghcb_gpa = value; +} + static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) { - return -EINVAL; + struct vmcb_control_area *control = &svm->vmcb->control; + u64 ghcb_info; + + ghcb_info = control->ghcb_gpa & GHCB_MSR_INFO_MASK; + + switch (ghcb_info) { + case GHCB_MSR_SEV_INFO_REQ: + set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX, + GHCB_VERSION_MIN, + sev_enc_bit)); + break; + default: + return -EINVAL; + } + + return 1; } int sev_handle_vmgexit(struct vcpu_svm *svm) diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 1690e52d5265..b1a5d90a860c 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -506,9 +506,26 @@ void svm_vcpu_unblocking(struct kvm_vcpu *vcpu); /* sev.c */ +#define GHCB_VERSION_MAX 1ULL +#define GHCB_VERSION_MIN 1ULL + #define GHCB_MSR_INFO_POS 0 #define GHCB_MSR_INFO_MASK (BIT_ULL(12) - 1) +#define GHCB_MSR_SEV_INFO_RESP 0x001 +#define GHCB_MSR_SEV_INFO_REQ 0x002 +#define GHCB_MSR_VER_MAX_POS 48 +#define GHCB_MSR_VER_MAX_MASK 0xffff +#define GHCB_MSR_VER_MIN_POS 32 +#define GHCB_MSR_VER_MIN_MASK 0xffff +#define GHCB_MSR_CBIT_POS 24 +#define GHCB_MSR_CBIT_MASK 0xff +#define GHCB_MSR_SEV_INFO(_max, _min, _cbit) \ + ((((_max) & GHCB_MSR_VER_MAX_MASK) << GHCB_MSR_VER_MAX_POS) | \ + (((_min) & GHCB_MSR_VER_MIN_MASK) << GHCB_MSR_VER_MIN_POS) | \ + (((_cbit) & GHCB_MSR_CBIT_MASK) << GHCB_MSR_CBIT_POS) | \ + GHCB_MSR_SEV_INFO_RESP) + extern unsigned int max_sev_asid; static inline bool svm_sev_enabled(void) -- 2.28.0