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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v12 19/46] x86/kernel: Make the .bss..decrypted section shared in RMP table Date: Mon, 7 Mar 2022 15:33:29 -0600 Message-ID: <20220307213356.2797205-20-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220307213356.2797205-1-brijesh.singh@amd.com> References: <20220307213356.2797205-1-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: 462b1a0d-b51c-4899-6480-08da0082546b X-MS-TrafficTypeDiagnostic: LV2PR12MB5894: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)(36840700001)(46966006)(4326008)(70586007)(336012)(7416002)(426003)(7406005)(7696005)(70206006)(8936002)(86362001)(8676002)(508600001)(2616005)(1076003)(83380400001)(44832011)(82310400004)(40460700003)(54906003)(110136005)(316002)(36860700001)(36756003)(81166007)(26005)(186003)(16526019)(5660300002)(356005)(2906002)(6666004)(47076005)(142923001)(101420200003)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:34:58.7637 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 462b1a0d-b51c-4899-6480-08da0082546b 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: BN8NAM11FT048.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5894 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2C42214000D X-Stat-Signature: 73oxgn3yoezsgr8z8gpug88fr416u5ya Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=W5KDCr5X; spf=pass (imf09.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.94.50 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-HE-Tag: 1646688902-544032 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