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David Alan Gilbert" , , , , , Venu Busireddy , Brijesh Singh Subject: [PATCH v12 02/46] KVM: SVM: Create a separate mapping for the SEV-ES save area Date: Mon, 7 Mar 2022 15:33:12 -0600 Message-ID: <20220307213356.2797205-3-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220307213356.2797205-1-brijesh.singh@amd.com> References: <20220307213356.2797205-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 796e0ee9-2e85-44d1-b389-08da00823ef7 X-MS-TrafficTypeDiagnostic: CY4PR12MB1461:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(40470700004)(8936002)(5660300002)(47076005)(40460700003)(316002)(54906003)(7696005)(36756003)(508600001)(110136005)(2616005)(6666004)(70586007)(83380400001)(426003)(336012)(86362001)(82310400004)(186003)(26005)(16526019)(8676002)(1076003)(4326008)(70206006)(44832011)(36860700001)(2906002)(81166007)(7406005)(356005)(7416002)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:34:22.7734 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 796e0ee9-2e85-44d1-b389-08da00823ef7 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT056.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1461 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham 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 From: Tom Lendacky The save area for SEV-ES/SEV-SNP guests, as used by the hardware, is different from the save area of a non SEV-ES/SEV-SNP guest. This is the first step in defining the multiple save areas to keep them separate and ensuring proper operation amongst the different types of guests. Create an SEV-ES/SEV-SNP save area and adjust usage to the new save area definition where needed. Reviewed-by: Venu Busireddy Signed-off-by: Tom Lendacky Signed-off-by: Brijesh Singh --- arch/x86/include/asm/svm.h | 87 +++++++++++++++++++++++++++++--------- arch/x86/kvm/svm/sev.c | 24 +++++------ arch/x86/kvm/svm/svm.h | 2 +- 3 files changed, 80 insertions(+), 33 deletions(-) diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index b25b4e5ae6f9..e748aa33c355 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -263,6 +263,7 @@ struct vmcb_seg { u64 base; } __packed; +/* Save area definition for legacy and SEV-MEM guests */ struct vmcb_save_area { struct vmcb_seg es; struct vmcb_seg cs; @@ -279,8 +280,58 @@ struct vmcb_save_area { u8 cpl; u8 reserved_2[4]; u64 efer; + u8 reserved_3[112]; + u64 cr4; + u64 cr3; + u64 cr0; + u64 dr7; + u64 dr6; + u64 rflags; + u64 rip; + u8 reserved_4[88]; + u64 rsp; + u64 s_cet; + u64 ssp; + u64 isst_addr; + u64 rax; + u64 star; + u64 lstar; + u64 cstar; + u64 sfmask; + u64 kernel_gs_base; + u64 sysenter_cs; + u64 sysenter_esp; + u64 sysenter_eip; + u64 cr2; + u8 reserved_5[32]; + u64 g_pat; + u64 dbgctl; + u64 br_from; + u64 br_to; + u64 last_excp_from; + u64 last_excp_to; + u8 reserved_6[72]; + u32 spec_ctrl; /* Guest version of SPEC_CTRL at 0x2E0 */ +} __packed; + +/* Save area definition for SEV-ES and SEV-SNP guests */ +struct sev_es_save_area { + struct vmcb_seg es; + struct vmcb_seg cs; + struct vmcb_seg ss; + struct vmcb_seg ds; + struct vmcb_seg fs; + struct vmcb_seg gs; + struct vmcb_seg gdtr; + struct vmcb_seg ldtr; + struct vmcb_seg idtr; + struct vmcb_seg tr; + u8 reserved_1[43]; + u8 cpl; + u8 reserved_2[4]; + u64 efer; u8 reserved_3[104]; - u64 xss; /* Valid for SEV-ES only */ + u64 xss; u64 cr4; u64 cr3; u64 cr0; @@ -308,22 +359,14 @@ struct vmcb_save_area { u64 br_to; u64 last_excp_from; u64 last_excp_to; - - /* - * The following part of the save area is valid only for - * SEV-ES guests when referenced through the GHCB or for - * saving to the host save area. - */ - u8 reserved_7[72]; - u32 spec_ctrl; /* Guest version of SPEC_CTRL at 0x2E0 */ - u8 reserved_7b[4]; + u8 reserved_7[80]; u32 pkru; - u8 reserved_7a[20]; - u64 reserved_8; /* rax already available at 0x01f8 */ + u8 reserved_9[20]; + u64 reserved_10; /* rax already available at 0x01f8 */ u64 rcx; u64 rdx; u64 rbx; - u64 reserved_9; /* rsp already available at 0x01d8 */ + u64 reserved_11; /* rsp already available at 0x01d8 */ u64 rbp; u64 rsi; u64 rdi; @@ -335,23 +378,25 @@ struct vmcb_save_area { u64 r13; u64 r14; u64 r15; - u8 reserved_10[16]; + u8 reserved_12[16]; u64 sw_exit_code; u64 sw_exit_info_1; u64 sw_exit_info_2; u64 sw_scratch; u64 sev_features; - u8 reserved_11[48]; + u8 reserved_13[48]; u64 xcr0; u8 valid_bitmap[16]; u64 x87_state_gpa; } __packed; +#define GHCB_SHARED_BUF_SIZE 2032 + struct ghcb { - struct vmcb_save_area save; - u8 reserved_save[2048 - sizeof(struct vmcb_save_area)]; + struct sev_es_save_area save; + u8 reserved_save[2048 - sizeof(struct sev_es_save_area)]; - u8 shared_buffer[2032]; + u8 shared_buffer[GHCB_SHARED_BUF_SIZE]; u8 reserved_1[10]; u16 protocol_version; /* negotiated SEV-ES/GHCB protocol version */ @@ -359,13 +404,15 @@ struct ghcb { } __packed; -#define EXPECTED_VMCB_SAVE_AREA_SIZE 1032 +#define EXPECTED_VMCB_SAVE_AREA_SIZE 740 +#define EXPECTED_SEV_ES_SAVE_AREA_SIZE 1032 #define EXPECTED_VMCB_CONTROL_AREA_SIZE 1024 #define EXPECTED_GHCB_SIZE PAGE_SIZE static inline void __unused_size_checks(void) { BUILD_BUG_ON(sizeof(struct vmcb_save_area) != EXPECTED_VMCB_SAVE_AREA_SIZE); + BUILD_BUG_ON(sizeof(struct sev_es_save_area) != EXPECTED_SEV_ES_SAVE_AREA_SIZE); BUILD_BUG_ON(sizeof(struct vmcb_control_area) != EXPECTED_VMCB_CONTROL_AREA_SIZE); BUILD_BUG_ON(sizeof(struct ghcb) != EXPECTED_GHCB_SIZE); } @@ -435,7 +482,7 @@ struct vmcb { /* GHCB Accessor functions */ #define GHCB_BITMAP_IDX(field) \ - (offsetof(struct vmcb_save_area, field) / sizeof(u64)) + (offsetof(struct sev_es_save_area, field) / sizeof(u64)) #define DEFINE_GHCB_ACCESSORS(field) \ static inline bool ghcb_##field##_is_valid(const struct ghcb *ghcb) \ diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 17b53457d866..b6245298f805 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -558,12 +558,20 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) static int sev_es_sync_vmsa(struct vcpu_svm *svm) { - struct vmcb_save_area *save = &svm->vmcb->save; + struct sev_es_save_area *save = svm->sev_es.vmsa; /* Check some debug related fields before encrypting the VMSA */ - if (svm->vcpu.guest_debug || (save->dr7 & ~DR7_FIXED_1)) + if (svm->vcpu.guest_debug || (svm->vmcb->save.dr7 & ~DR7_FIXED_1)) return -EINVAL; + /* + * SEV-ES will use a VMSA that is pointed to by the VMCB, not + * the traditional VMSA that is part of the VMCB. Copy the + * traditional VMSA as it has been built so far (in prep + * for LAUNCH_UPDATE_VMSA) to be the initial SEV-ES state. + */ + memcpy(save, &svm->vmcb->save, sizeof(svm->vmcb->save)); + /* Sync registgers */ save->rax = svm->vcpu.arch.regs[VCPU_REGS_RAX]; save->rbx = svm->vcpu.arch.regs[VCPU_REGS_RBX]; @@ -591,14 +599,6 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm) save->xss = svm->vcpu.arch.ia32_xss; save->dr6 = svm->vcpu.arch.dr6; - /* - * SEV-ES will use a VMSA that is pointed to by the VMCB, not - * the traditional VMSA that is part of the VMCB. Copy the - * traditional VMSA as it has been built so far (in prep - * for LAUNCH_UPDATE_VMSA) to be the initial SEV-ES state. - */ - memcpy(svm->sev_es.vmsa, save, sizeof(*save)); - return 0; } @@ -2910,7 +2910,7 @@ void sev_es_vcpu_reset(struct vcpu_svm *svm) void sev_es_prepare_guest_switch(struct vcpu_svm *svm, unsigned int cpu) { struct svm_cpu_data *sd = per_cpu(svm_data, cpu); - struct vmcb_save_area *hostsa; + struct sev_es_save_area *hostsa; /* * As an SEV-ES guest, hardware will restore the host state on VMEXIT, @@ -2920,7 +2920,7 @@ void sev_es_prepare_guest_switch(struct vcpu_svm *svm, unsigned int cpu) vmsave(__sme_page_pa(sd->save_area)); /* XCR0 is restored on VMEXIT, save the current host value */ - hostsa = (struct vmcb_save_area *)(page_address(sd->save_area) + 0x400); + hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400); hostsa->xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); /* PKRU is restored on VMEXIT, save the current host value */ diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index fa98d6844728..a10f3deb8133 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -167,7 +167,7 @@ struct svm_nested_state { struct vcpu_sev_es_state { /* SEV-ES support */ - struct vmcb_save_area *vmsa; + struct sev_es_save_area *vmsa; struct ghcb *ghcb; struct kvm_host_map ghcb_map; bool received_first_sipi; -- 2.25.1