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David Alan Gilbert" , , , Subject: Re: [PATCH v8 29/40] x86/compressed/64: add support for SEV-SNP CPUID table in #VC handlers Message-ID: <20220118143238.lu22npcktxuvadwk@amd.com> References: <20211210154332.11526-1-brijesh.singh@amd.com> <20211210154332.11526-30-brijesh.singh@amd.com> <20220113163913.phpu4klrmrnedgic@amd.com> <20220118043521.exgma53qrzrbalpd@amd.com> <20220118142345.65wuub2p3alavhpb@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20220118142345.65wuub2p3alavhpb@amd.com> X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f77ca88e-ce5a-4ef3-ef06-08d9da8f6af4 X-MS-TrafficTypeDiagnostic: SN6PR12MB2735:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5797; 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:(4636009)(40470700002)(46966006)(36840700001)(40460700001)(26005)(70206006)(316002)(36860700001)(426003)(6666004)(1076003)(4326008)(70586007)(82310400004)(5660300002)(2616005)(336012)(16526019)(44832011)(186003)(7406005)(7416002)(2906002)(8936002)(6916009)(508600001)(86362001)(36756003)(54906003)(81166007)(356005)(47076005)(83380400001)(8676002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2022 14:32:55.7376 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f77ca88e-ce5a-4ef3-ef06-08d9da8f6af4 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: CO1NAM11FT053.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR12MB2735 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 18, 2022 at 08:23:45AM -0600, Michael Roth wrote: > On Tue, Jan 18, 2022 at 03:02:48PM +0100, Borislav Petkov wrote: > > On Mon, Jan 17, 2022 at 10:35:21PM -0600, Michael Roth wrote: > > > Unfortunately, in sev_enable(), between the point where snp_init() is > > > called, and sev_status is actually set, there are a number of cpuid > > > intructions which will make use of do_vc_no_ghcb() prior to sev_status > > > being set (and it needs to happen in that order to set sev_status > > > appropriately). After that point, snp_cpuid_active() would no longer be > > > necessary, but during that span some indicator is needed in case this > > > is just an SEV-ES guest trigger cpuid #VCs. > > > > You mean testing what snp_cpuid_info_create() set up is not enough? > > > > diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c > > index 7bc7e297f88c..17cfe804bad3 100644 > > --- a/arch/x86/kernel/sev-shared.c > > +++ b/arch/x86/kernel/sev-shared.c > > @@ -523,7 +523,9 @@ static int snp_cpuid_postprocess(u32 func, u32 subfunc, u32 *eax, u32 *ebx, > > static int snp_cpuid(u32 func, u32 subfunc, u32 *eax, u32 *ebx, u32 *ecx, > > u32 *edx) > > { > > - if (!snp_cpuid_active()) > > + const struct snp_cpuid_info *c = snp_cpuid_info_get_ptr(); > > + > > + if (!c->count) > > return -EOPNOTSUPP; > > > > if (!snp_cpuid_find_validated_func(func, subfunc, eax, ebx, ecx, edx)) { > > snp_cpuid_info_get_ptr() will always return non-NULL, since it's a > pointer to the local copy of the cpuid page. But I can probably re-work Doh, misread your patch. Yes I think checking the count would also work, since a valid table should be non-zero.