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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v12 33/46] x86/boot: Add a pointer to Confidential Computing blob in bootparams Date: Mon, 7 Mar 2022 15:33:43 -0600 Message-ID: <20220307213356.2797205-34-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-Transfer-Encoding: 8bit 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: 0bca2664-5d24-4fe8-e17b-08da0082625f X-MS-TrafficTypeDiagnostic: BN7PR12MB2674: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)(36840700001)(40470700004)(83380400001)(40460700003)(7406005)(7416002)(2906002)(44832011)(36756003)(508600001)(36860700001)(6666004)(7696005)(426003)(336012)(5660300002)(26005)(8936002)(186003)(81166007)(16526019)(86362001)(356005)(70206006)(4326008)(8676002)(1076003)(70586007)(2616005)(110136005)(54906003)(316002)(47076005)(82310400004)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:35:22.1764 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0bca2664-5d24-4fe8-e17b-08da0082625f 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: BN8NAM11FT005.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR12MB2674 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth The previously defined Confidential Computing blob is provided to the kernel via a setup_data structure or EFI config table entry. Currently these are both checked for by boot/compressed kernel to access the CPUID table address within it for use with SEV-SNP CPUID enforcement. To also enable SEV-SNP CPUID enforcement for the run-time kernel, similar early access to the CPUID table is needed early on while it's still using the identity-mapped page table set up by boot/compressed, where global pointers need to be accessed via fixup_pointer(). This isn't much of an issue for accessing setup_data, and the EFI config table helper code currently used in boot/compressed *could* be used in this case as well since they both rely on identity-mapping. However, it has some reliance on EFI helpers/string constants that would need to be accessed via fixup_pointer(), and fixing it up while making it shareable between boot/compressed and run-time kernel is fragile and introduces a good bit of uglyness. Instead, add a boot_params->cc_blob_address pointer that the boot/compressed kernel can initialize so that the run-time kernel can access the CC blob from there instead of re-scanning the EFI config table. Also document these in Documentation/x86/zero-page.rst. While there, add missing documentation for the acpi_rsdp_addr field, which serves a similar purpose in providing the run-time kernel a pointer to the ACPI RSDP table so that it does not need to [re-]scan the EFI configuration table. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- Documentation/x86/zero-page.rst | 2 ++ arch/x86/include/asm/bootparam_utils.h | 1 + arch/x86/include/uapi/asm/bootparam.h | 3 ++- 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/x86/zero-page.rst b/Documentation/x86/zero-page.rst index f088f5881666..45aa9cceb4f1 100644 --- a/Documentation/x86/zero-page.rst +++ b/Documentation/x86/zero-page.rst @@ -19,6 +19,7 @@ Offset/Size Proto Name Meaning 058/008 ALL tboot_addr Physical address of tboot shared page 060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information (struct ist_info) +070/008 ALL acpi_rsdp_addr Physical address of ACPI RSDP table 080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! 090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! 0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), @@ -27,6 +28,7 @@ Offset/Size Proto Name Meaning 0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits 0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits 0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits +13C/004 ALL cc_blob_address Physical address of Confidential Computing blob 140/080 ALL edid_info Video mode setup (struct edid_info) 1C0/020 ALL efi_info EFI 32 information (struct efi_info) 1E0/004 ALL alt_mem_k Alternative mem check, in KB diff --git a/arch/x86/include/asm/bootparam_utils.h b/arch/x86/include/asm/bootparam_utils.h index 981fe923a59f..53e9b0620d96 100644 --- a/arch/x86/include/asm/bootparam_utils.h +++ b/arch/x86/include/asm/bootparam_utils.h @@ -74,6 +74,7 @@ static void sanitize_boot_params(struct boot_params *boot_params) BOOT_PARAM_PRESERVE(hdr), BOOT_PARAM_PRESERVE(e820_table), BOOT_PARAM_PRESERVE(eddbuf), + BOOT_PARAM_PRESERVE(cc_blob_address), }; memset(&scratch, 0, sizeof(scratch)); diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h index 1ac5acca72ce..bea5cdcdf532 100644 --- a/arch/x86/include/uapi/asm/bootparam.h +++ b/arch/x86/include/uapi/asm/bootparam.h @@ -188,7 +188,8 @@ struct boot_params { __u32 ext_ramdisk_image; /* 0x0c0 */ __u32 ext_ramdisk_size; /* 0x0c4 */ __u32 ext_cmd_line_ptr; /* 0x0c8 */ - __u8 _pad4[116]; /* 0x0cc */ + __u8 _pad4[112]; /* 0x0cc */ + __u32 cc_blob_address; /* 0x13c */ struct edid_info edid_info; /* 0x140 */ struct efi_info efi_info; /* 0x1c0 */ __u32 alt_mem_k; /* 0x1e0 */ -- 2.25.1