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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MWH0EPF000A6730.mail.protection.outlook.com (10.167.249.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7386.12 via Frontend Transport; Tue, 12 Mar 2024 18:48:08 +0000 Received: from ethanolx7e2ehost.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 12 Mar 2024 13:48:07 -0500 From: Ashish Kalra To: CC: , , , , Subject: [PATCH] x86/sev: Apply RMP table fixups for kexec. Date: Tue, 12 Mar 2024 18:47:57 +0000 Message-ID: <20240312184757.52699-1-Ashish.Kalra@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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-TrafficTypeDiagnostic: MWH0EPF000A6730:EE_|PH8PR12MB7160:EE_ X-MS-Office365-Filtering-Correlation-Id: 76f8609f-e4b3-4a2e-66d0-08dc42c4f5a8 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:(13230031)(376005)(82310400014)(1800799015)(36860700004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Mar 2024 18:48:08.0526 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 76f8609f-e4b3-4a2e-66d0-08dc42c4f5a8 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: MWH0EPF000A6730.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7160 Content-Type: text/plain; charset="utf-8" From: Ashish Kalra RMP table start and end physical range may not be aligned to 2MB in the e820 tables causing fatal RMP page faults during kexec boot when new page allocations are done in the same 2MB page as the RMP table. Check if RMP table start and end physical range in e820_table is not aligned to 2MB and in that case use e820__range_update() to map this range to reserved. Override e820__memory_setup_default() to check and apply these RMP table fixups in e820_table before e820_table is used to setup e280_table_firmware and e820_table_kexec. Fixes: c3b86e61b756 ("x86/cpufeatures: Enable/unmask SEV-SNP CPU feature") Signed-off-by: Ashish Kalra Tested-by: Srikanth Aithal --- arch/x86/virt/svm/sev.c | 52 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c index cffe1157a90a..e0d7584df28f 100644 --- a/arch/x86/virt/svm/sev.c +++ b/arch/x86/virt/svm/sev.c @@ -65,6 +65,8 @@ static u64 probed_rmp_base, probed_rmp_size; static struct rmpentry *rmptable __ro_after_init; static u64 rmptable_max_pfn __ro_after_init; =20 +static char *__init snp_rmptable_e820_fixup(void); + static LIST_HEAD(snp_leaked_pages_list); static DEFINE_SPINLOCK(snp_leaked_pages_list_lock); =20 @@ -160,9 +162,59 @@ bool snp_probe_rmptable_info(void) pr_info("RMP table physical range [0x%016llx - 0x%016llx]\n", probed_rmp_base, probed_rmp_base + probed_rmp_size - 1); =20 + /* + * Override e820__memory_setup_default() to do any RMP table fixups + * for kexec if required. + */ + x86_init.resources.memory_setup =3D snp_rmptable_e820_fixup; + return true; } =20 +/* + * Override e820__memory_setup_default() to do any RMP table fixups + * in e820_table before e820_table_firmware and e820_table_kexec + * are setup. + */ +static char *__init snp_rmptable_e820_fixup(void) +{ + /* Populate e820_table from BIOS-supplied e820 map */ + char *p =3D e820__memory_setup_default(); + u64 pa; + + /* + * RMP table start & end physical range may not be aligned to 2MB in the + * e820 tables causing fatal RMP page faults during kexec boot when new + * page allocations are done in the same 2MB page as the RMP table. + * Check if RMP table start & end physical range in e820_table is not ali= gned + * to 2MB and in that case use e820__range_update() to map this range to = reserved, + * e820__range_update() nicely handles partial range update and also + * merges any consecutive ranges of the same type. + * Need to override e820__memory_setup_default() to check and apply + * fixups in e820_table before e820_table is used to setup + * e280_table_firmware and e820_table_kexec. + */ + pa =3D probed_rmp_base; + if (!IS_ALIGNED(pa, PMD_SIZE)) { + pa =3D ALIGN_DOWN(pa, PMD_SIZE); + if (e820__mapped_any(pa, pa + PMD_SIZE, E820_TYPE_RAM)) { + pr_info("Reserving start of RMP table on a 2MB boundary [0x%016llx]\n",= pa); + e820__range_update(pa, PMD_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED); + } + } + + pa =3D probed_rmp_base + probed_rmp_size; + if (!IS_ALIGNED(pa, PMD_SIZE)) { + pa =3D ALIGN_DOWN(pa, PMD_SIZE); + if (e820__mapped_any(pa, pa + PMD_SIZE, E820_TYPE_RAM)) { + pr_info("Reserving end of RMP table on a 2MB boundary [0x%016llx]\n", p= a); + e820__range_update(pa, PMD_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED); + } + } + + return p; +} + /* * Do the necessary preparations which are verified by the firmware as * described in the SNP_INIT_EX firmware command description in the SNP --=20 2.34.1