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David Alan Gilbert" , , , , , Brijesh Singh , Venu Busireddy Subject: [PATCH v11 10/45] x86/sev: Define the Linux specific guest termination reasons Date: Thu, 24 Feb 2022 10:55:50 -0600 Message-ID: <20220224165625.2175020-11-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220224165625.2175020-1-brijesh.singh@amd.com> References: <20220224165625.2175020-1-brijesh.singh@amd.com> MIME-Version: 1.0 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: 9fc5c972-2c08-416e-e902-08d9f7b6dccb X-MS-TrafficTypeDiagnostic: BYAPR12MB2647: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)(40470700004)(46966006)(36840700001)(47076005)(16526019)(70586007)(2616005)(1076003)(4326008)(70206006)(8676002)(110136005)(26005)(54906003)(336012)(426003)(186003)(7696005)(6666004)(83380400001)(2906002)(40460700003)(36756003)(36860700001)(44832011)(5660300002)(508600001)(86362001)(7406005)(8936002)(316002)(81166007)(356005)(7416002)(82310400004)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2022 16:58:20.9001 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9fc5c972-2c08-416e-e902-08d9f7b6dccb 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: DM6NAM11FT046.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2647 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 99A1C40003 X-Stat-Signature: qmx583pnz9f6i6eip1q833qp4ubusups Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=rx5NGHIM; spf=pass (imf11.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.243.61 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-Rspam-User: X-HE-Tag: 1645721904-690682 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: GHCB specification defines the reason code for reason set 0. The reason codes defined in the set 0 do not cover all possible causes for a guest to request termination. The reason sets 1 to 255 are reserved for the vendor-specific codes. Reserve the reason set 1 for the Linux guest. Define the error codes for reason set 1 so that one can have meaningful termination reasons and thus better guest failure diagnosis. While at it, change the sev_es_terminate() to accept the reason set parameter. Reviewed-by: Venu Busireddy Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/sev.c | 6 +++--- arch/x86/include/asm/sev-common.h | 8 ++++++++ arch/x86/kernel/sev-shared.c | 11 ++++------- arch/x86/kernel/sev.c | 4 ++-- 4 files changed, 17 insertions(+), 12 deletions(-) diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index 27ccd5a5ff60..56e941d5e092 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -119,7 +119,7 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, static bool early_setup_sev_es(void) { if (!sev_es_negotiate_protocol()) - sev_es_terminate(GHCB_SEV_ES_PROT_UNSUPPORTED); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_PROT_UNSUPPORTED); if (set_page_decrypted((unsigned long)&boot_ghcb_page)) return false; @@ -172,7 +172,7 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) enum es_result result; if (!boot_ghcb && !early_setup_sev_es()) - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); vc_ghcb_invalidate(boot_ghcb); result = vc_init_em_ctxt(&ctxt, regs, exit_code); @@ -199,7 +199,7 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) if (result == ES_OK) vc_finish_insn(&ctxt); else if (result != ES_RETRY) - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); } void sev_enable(struct boot_params *bp) diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index 1b2fd32b42fe..94f0ea574049 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -73,9 +73,17 @@ /* GHCBData[23:16] */ \ ((((u64)reason_val) & 0xff) << 16)) +/* Error codes from reason set 0 */ +#define SEV_TERM_SET_GEN 0 #define GHCB_SEV_ES_GEN_REQ 0 #define GHCB_SEV_ES_PROT_UNSUPPORTED 1 +/* Linux-specific reason codes (used with reason set 1) */ +#define SEV_TERM_SET_LINUX 1 +#define GHCB_TERM_REGISTER 0 /* GHCB GPA registration failure */ +#define GHCB_TERM_PSC 1 /* Page State Change failure */ +#define GHCB_TERM_PVALIDATE 2 /* Pvalidate failure */ + #define GHCB_RESP_CODE(v) ((v) & GHCB_MSR_INFO_MASK) /* diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index ce987688bbc0..2abf8a7d75e5 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -24,15 +24,12 @@ static bool __init sev_es_check_cpu_features(void) return true; } -static void __noreturn sev_es_terminate(unsigned int reason) +static void __noreturn sev_es_terminate(unsigned int set, unsigned int reason) { u64 val = GHCB_MSR_TERM_REQ; - /* - * Tell the hypervisor what went wrong - only reason-set 0 is - * currently supported. - */ - val |= GHCB_SEV_TERM_REASON(0, reason); + /* Tell the hypervisor what went wrong. */ + val |= GHCB_SEV_TERM_REASON(set, reason); /* Request Guest Termination from Hypvervisor */ sev_es_wr_ghcb_msr(val); @@ -221,7 +218,7 @@ void __init do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) fail: /* Terminate the guest */ - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); } static enum es_result vc_insn_string_read(struct es_em_ctxt *ctxt, diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index e6d316a01fdd..19ad09712902 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1337,7 +1337,7 @@ DEFINE_IDTENTRY_VC_KERNEL(exc_vmm_communication) show_regs(regs); /* Ask hypervisor to sev_es_terminate */ - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); /* If that fails and we get here - just panic */ panic("Returned from Terminate-Request to Hypervisor\n"); @@ -1385,7 +1385,7 @@ bool __init handle_vc_boot_ghcb(struct pt_regs *regs) /* Do initial setup or terminate the guest */ if (unlikely(boot_ghcb == NULL && !sev_es_setup_ghcb())) - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); vc_ghcb_invalidate(boot_ghcb);