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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 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: 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 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: C324140011 X-Stat-Signature: ancex8hxgpi5f37hykjs4phiwx8wk9q9 Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=d9CD2KVz; spf=pass (imf27.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.93.56 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-HE-Tag: 1645721919-542343 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 | 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 =3D (unsigned long)__start_bss_decrypted; vaddr_end =3D (unsigned long)__end_bss_decrypted; + for (; vaddr < vaddr_end; vaddr +=3D 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 =3D pmd_index(vaddr); pmd[i] -=3D sme_get_me_mask(); } --=20 2.25.1