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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v11 19/45] x86/kernel: Make the .bss..decrypted section shared in RMP table Date: Thu, 24 Feb 2022 10:55:59 -0600 Message-ID: <20220224165625.2175020-20-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: 9b196bce-1c6a-4e3d-413e-08d9f7b6e66c X-MS-TrafficTypeDiagnostic: CY4PR12MB1926: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)(40470700004)(36840700001)(5660300002)(36860700001)(44832011)(83380400001)(7696005)(7406005)(40460700003)(7416002)(336012)(2906002)(110136005)(6666004)(426003)(8936002)(47076005)(54906003)(36756003)(16526019)(2616005)(4326008)(81166007)(26005)(82310400004)(316002)(1076003)(86362001)(356005)(186003)(8676002)(508600001)(70206006)(70586007)(142923001)(101420200003)(36900700001)(2101003); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2022 16:58:37.0504 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b196bce-1c6a-4e3d-413e-08d9f7b6e66c 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: DM6NAM11FT063.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1926 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org The encryption attribute for the .bss..decrypted section is cleared in the 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 | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 83514b9827e6..656d2f3e2cf0 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -143,7 +143,20 @@ static unsigned long __head sme_postprocess_startup(struct boot_params *bp, pmdv if (sme_get_me_mask()) { vaddr = (unsigned long)__start_bss_decrypted; vaddr_end = (unsigned long)__end_bss_decrypted; + for (; vaddr < vaddr_end; vaddr += PMD_SIZE) { + /* + * On SNP, transition the page to shared in the RMP table so that + * it is consistent with the page table attribute change. + * + * __start_bss_decrypted has a virtual address in the high range + * mapping (kernel .text). PVALIDATE, by way of + * early_snp_set_memory_shared(), requires a valid virtual + * address but the kernel is currently running off of the identity + * mapping so use __pa() to get a *currently* valid virtual address. + */ + early_snp_set_memory_shared(__pa(vaddr), __pa(vaddr), PTRS_PER_PMD); + i = pmd_index(vaddr); pmd[i] -= sme_get_me_mask(); }