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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v9 17/43] x86/kernel: Make the .bss..decrypted section shared in RMP table Date: Fri, 28 Jan 2022 11:17:38 -0600 Message-ID: <20220128171804.569796-18-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220128171804.569796-1-brijesh.singh@amd.com> References: <20220128171804.569796-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain 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: e3389a56-841f-4068-df05-08d9e2824152 X-MS-TrafficTypeDiagnostic: BN6PR12MB1923:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5516; 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)(81166007)(54906003)(110136005)(6666004)(316002)(82310400004)(7696005)(356005)(5660300002)(8936002)(8676002)(86362001)(70586007)(40460700003)(4326008)(70206006)(2906002)(426003)(2616005)(1076003)(36860700001)(336012)(186003)(26005)(508600001)(36756003)(16526019)(7416002)(47076005)(7406005)(83380400001)(44832011)(142923001)(101420200003)(2101003)(36900700001)(20210929001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jan 2022 17:18:51.8118 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3389a56-841f-4068-df05-08d9e2824152 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: DM6NAM11FT051.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR12MB1923 X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: DF21A40019 X-Stat-Signature: o96eycibrjws7okuzseh6g47c9f1pefz Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=CxoZJFlf; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf11.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.243.53 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Rspam-User: nil X-HE-Tag: 1643390336-86662 Content-Transfer-Encoding: quoted-printable 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: The encryption attribute for the .bss..decrypted section is cleared in th= e initial page table build. This is because the section contains the data that need to be shared between the guest and the hypervisor. When SEV-SNP is active, just clearing the encryption attribute in the page table is not enough. The page state need to be updated in the RMP table. Signed-off-by: Brijesh Singh --- arch/x86/kernel/head64.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 8075e91cff2b..1239bc104cda 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -143,7 +143,21 @@ static unsigned long sme_postprocess_startup(struct = boot_params *bp, pmdval_t *p if (sme_get_me_mask()) { vaddr =3D (unsigned long)__start_bss_decrypted; vaddr_end =3D (unsigned long)__end_bss_decrypted; + for (; vaddr < vaddr_end; vaddr +=3D PMD_SIZE) { + /* + * When SEV-SNP is active then transition the page to + * shared in the RMP table so that it is consistent with + * the page table attribute change. + * + * At this point, kernel is running in identity mapped mode. + * The __start_bss_decrypted is a regular kernel address. The + * early_snp_set_memory_shared() requires a valid virtual + * address, so use __pa() against __start_bss_decrypted to + * get valid virtual address. + */ + early_snp_set_memory_shared(__pa(vaddr), __pa(vaddr), PTRS_PER_PMD); + i =3D pmd_index(vaddr); pmd[i] -=3D sme_get_me_mask(); } --=20 2.25.1