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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part1 RFC v4 24/36] x86/compressed/acpi: move EFI config table access to common code Date: Wed, 7 Jul 2021 13:14:54 -0500 Message-Id: <20210707181506.30489-25-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707181506.30489-1-brijesh.singh@amd.com> References: <20210707181506.30489-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.19 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?V/xY1WuiR5o8Qx+vaGhw3GgS4CCJasBwIfrmSbdPoFSutf79EubvsSezwK/f?= =?us-ascii?Q?xIYIlaKmv8JhYHyoSJXsGSOZlcQWf8P2l6wTDVlyrtk1fZ7z0vSf1GTs/0DV?= =?us-ascii?Q?9QbilIF04nIMP69JbaL5RmUjj2dHurQT9TznZNeq8Irt4TG2vZXNM3qIa/uL?= =?us-ascii?Q?DsL8hV9lJs18/jfIuAXdkO72lV7rFI90dJ49p5CKt9jhlRBkJ3xnxeXdph4p?= =?us-ascii?Q?ED82ClC6Us5fg/TUAr9+/5v/QfCsXWv5olnmjJeeaLmZurDze+GHlhW1MKJq?= =?us-ascii?Q?A6PJVNq3Lry/PhdeAqCp/XtPpE6vCVIUJQLGWAkp2SkMyg2ZhNWYL+R5ltZx?= =?us-ascii?Q?Z6u29VpCTSLu/4c/qWYsVbUwEkOWwk04kssttA7pyp5c7pY5WKZ2DisaWXbc?= =?us-ascii?Q?DXKiSJpk5bS49newapzEXC8hzSTn0ZSD3iHFlbErMNg1mgyLzlpRbgHEe2o1?= =?us-ascii?Q?In3l38xL6E/qrmFaTQh8j+BQK1xXnow6IehlkoDNKI0lLPwyd1hBJd5UQgHG?= =?us-ascii?Q?9Dse/wMHGISifG5+0BAMlXMrhkqCUYBnDo0VCLk+m34BFwavBUzjtTI0yW9K?= =?us-ascii?Q?x7Cpv4BB8g3r/xAOZMnuLpSBx4XQPPband2X9xmsmkSyOZGTrsmVcD4pGVY4?= =?us-ascii?Q?IXiJ4/Ix9i5Y+pKmPB7RxJmGmG5t+b2n/vR3cQWEXoHpYHqm5Eh4vIhmpesB?= =?us-ascii?Q?T+gakdXtu5PkH+ZtPrQP49ZHMNWqxGuURjjNT6mF/sLphGl+kzGTvqYbM+rM?= =?us-ascii?Q?dyqATvbYVy1c5E2MTvnfjy78KeVYIAv4dPgBrFpAvmLC3IZBsjziUU46YebJ?= =?us-ascii?Q?NE3A4o4NfQ3HWdf2ZjfgunyRnOYhIJPZdEyMpPPggFyXvOKbRKiFA7yb6DU9?= =?us-ascii?Q?x62KvrqZn5BadMUT/oJ+RPpFjuKgahp9+tKJeWfM7CflrqXcmlY+b8xzARN6?= =?us-ascii?Q?ZHlis9jAFJbnc5s6IPOkrPnd9rr4c4tjc9UMMj4K9ddYvTY/NmtTZIW93JvV?= =?us-ascii?Q?Fw5pbQvl8lMAinnpJvhZC5PDk1tpBzvP+sZnGWf2CdmtbEZnctgfxCfXbk2l?= =?us-ascii?Q?QFwAG1Uzs7j3Yu9EfygSScf1wvFm/bJ1pfmn+ptD3MeELXVXzXP0GpmWDplu?= =?us-ascii?Q?SSBwAug837XBI839YEFSx5ni+1DI3igB6SPJto3VFmaGoO1DUxwNRIrfdMsK?= =?us-ascii?Q?y2FDHOFGY9OM9+do5Tg/f4vMReLtMJpPjsq0CBZlfTjR4yHS/+rSzhxCkQLf?= =?us-ascii?Q?/AxUFG8yBdj+d1+SbZKaVodBUcApPqrbO/3Nsm89pPw3+R8vkQRYcUsSclca?= =?us-ascii?Q?lP5X1HP6XUlGclwXGQIGlFSN?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 40d8fd6a-95f5-427d-da9b-08d9417357d3 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:16:30.2530 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: VFcZq9RuwmVk1/IuYKqJjcS+XUh+DXM7HdmC/wCzB77NB3lQL05pYsm2S8QgO017W2esZn4D6c3nsYLZ8WJrgQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB5016 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org From: Michael Roth Future patches for SEV-SNP-validated CPUID will also require early parsing of the EFI configuration. Move the related code into a set of helpers that can be re-used for that purpose. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/Makefile | 1 + arch/x86/boot/compressed/acpi.c | 124 +++++--------- arch/x86/boot/compressed/efi-config-table.c | 180 ++++++++++++++++++++ arch/x86/boot/compressed/misc.h | 50 ++++++ 4 files changed, 272 insertions(+), 83 deletions(-) create mode 100644 arch/x86/boot/compressed/efi-config-table.c diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 431bf7f846c3..b41aecfda49c 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -100,6 +100,7 @@ endif vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o +vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi-config-table.o efi-obj-$(CONFIG_EFI_STUB) = $(objtree)/drivers/firmware/efi/libstub/lib.a $(obj)/vmlinux: $(vmlinux-objs-y) $(efi-obj-y) FORCE diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index 8bcbcee54aa1..e087dcaf43b3 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -24,42 +24,36 @@ struct mem_vector immovable_mem[MAX_NUMNODES*2]; * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and * ACPI_TABLE_GUID are found, take the former, which has more features. */ +#ifdef CONFIG_EFI +static bool +rsdp_find_fn(efi_guid_t guid, unsigned long vendor_table, bool efi_64, + void *opaque) +{ + acpi_physical_address *rsdp_addr = opaque; + + if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) { + *rsdp_addr = vendor_table; + } else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) { + *rsdp_addr = vendor_table; + return false; + } + + return true; +} +#endif + static acpi_physical_address -__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables, +__efi_get_rsdp_addr(unsigned long config_table_pa, unsigned int config_table_len, bool efi_64) { acpi_physical_address rsdp_addr = 0; - #ifdef CONFIG_EFI - int i; - - /* Get EFI tables from systab. */ - for (i = 0; i < nr_tables; i++) { - acpi_physical_address table; - efi_guid_t guid; - - if (efi_64) { - efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i; - - guid = tbl->guid; - table = tbl->table; - - if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { - debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); - return 0; - } - } else { - efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i; - - guid = tbl->guid; - table = tbl->table; - } + int ret; - if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) - rsdp_addr = table; - else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) - return table; - } + ret = efi_foreach_conf_entry((void *)config_table_pa, config_table_len, + efi_64, rsdp_find_fn, &rsdp_addr); + if (ret) + debug_putstr("Error getting RSDP address.\n"); #endif return rsdp_addr; } @@ -87,7 +81,9 @@ static acpi_physical_address kexec_get_rsdp_addr(void) efi_system_table_64_t *systab; struct efi_setup_data *esd; struct efi_info *ei; + bool efi_64; char *sig; + int ret; esd = (struct efi_setup_data *)get_kexec_setup_data_addr(); if (!esd) @@ -98,18 +94,16 @@ static acpi_physical_address kexec_get_rsdp_addr(void) return 0; } - ei = &boot_params->efi_info; - sig = (char *)&ei->efi_loader_signature; - if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) { + /* Get systab from boot params. */ + ret = efi_bp_get_system_table(boot_params, (unsigned long *)&systab, &efi_64); + if (ret) + error("EFI system table not found in kexec boot_params."); + + if (!efi_64) { debug_putstr("Wrong kexec EFI loader signature.\n"); return 0; } - /* Get systab from boot params. */ - systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32)); - if (!systab) - error("EFI system table not found in kexec boot_params."); - return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true); } #else @@ -119,54 +113,18 @@ static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } static acpi_physical_address efi_get_rsdp_addr(void) { #ifdef CONFIG_EFI - unsigned long systab, config_tables; - unsigned int nr_tables; - struct efi_info *ei; + unsigned long config_table_pa = 0; + unsigned int config_table_len; bool efi_64; - char *sig; - - ei = &boot_params->efi_info; - sig = (char *)&ei->efi_loader_signature; - - if (!strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) { - efi_64 = true; - } else if (!strncmp(sig, EFI32_LOADER_SIGNATURE, 4)) { - efi_64 = false; - } else { - debug_putstr("Wrong EFI loader signature.\n"); - return 0; - } - - /* Get systab from boot params. */ -#ifdef CONFIG_X86_64 - systab = ei->efi_systab | ((__u64)ei->efi_systab_hi << 32); -#else - if (ei->efi_systab_hi || ei->efi_memmap_hi) { - debug_putstr("Error getting RSDP address: EFI system table located above 4GB.\n"); - return 0; - } - systab = ei->efi_systab; -#endif - if (!systab) - error("EFI system table not found."); - - /* Handle EFI bitness properly */ - if (efi_64) { - efi_system_table_64_t *stbl = (efi_system_table_64_t *)systab; - - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } else { - efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab; - - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } + int ret; - if (!config_tables) - error("EFI config tables not found."); + ret = efi_bp_get_conf_table(boot_params, &config_table_pa, + &config_table_len, &efi_64); + if (ret || !config_table_pa) + error("EFI config table not found."); - return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64); + return __efi_get_rsdp_addr(config_table_pa, config_table_len, + efi_64); #else return 0; #endif diff --git a/arch/x86/boot/compressed/efi-config-table.c b/arch/x86/boot/compressed/efi-config-table.c new file mode 100644 index 000000000000..d1a34aa7cefd --- /dev/null +++ b/arch/x86/boot/compressed/efi-config-table.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Helpers for early access to EFI configuration table + * + * Copyright (C) 2021 Advanced Micro Devices, Inc. + * + * Author: Michael Roth + */ + +#include "misc.h" +#include +#include + +/* Get vendor table address/guid from EFI config table at the given index */ +static int get_vendor_table(void *conf_table, unsigned int idx, + unsigned long *vendor_table_pa, + efi_guid_t *vendor_table_guid, + bool efi_64) +{ + if (efi_64) { + efi_config_table_64_t *table_entry = + (efi_config_table_64_t *)conf_table + idx; + + if (!IS_ENABLED(CONFIG_X86_64) && + table_entry->table >> 32) { + debug_putstr("Error: EFI config table entry located above 4GB.\n"); + return -EINVAL; + } + + *vendor_table_pa = table_entry->table; + *vendor_table_guid = table_entry->guid; + + } else { + efi_config_table_32_t *table_entry = + (efi_config_table_32_t *)conf_table + idx; + + *vendor_table_pa = table_entry->table; + *vendor_table_guid = table_entry->guid; + } + + return 0; +} + +/* + * Iterate through the entries in the EFI configuration table and pass the + * associated GUID/physical address of each entry on the provided callback + * function. + * + * @conf_table: pointer to EFI configuration table + * @conf_table_len: number of entries in EFI configuration table + * @efi_64: true if using 64-bit EFI + * @fn: callback function that returns true if iteration + * should continue + * @opaque: optional caller-provided data structure to pass to + * callback function on each iteration + * + * Returns 0 on success. + */ +int +efi_foreach_conf_entry(void *conf_table, unsigned int conf_table_len, + bool efi_64, bool (*fn)(efi_guid_t vendor_table_guid, + unsigned long vendor_table_pa, + bool efi_64, + void *opaque), + void *opaque) +{ + unsigned int i; + + for (i = 0; i < conf_table_len; i++) { + unsigned long vendor_table_pa; + efi_guid_t vendor_table_guid; + + if (get_vendor_table(conf_table, i, &vendor_table_pa, + &vendor_table_guid, efi_64)) + return -EINVAL; + + if (!fn(vendor_table_guid, vendor_table_pa, efi_64, opaque)) + break; + } + + return 0; +} + +/* + * Given boot_params, retrieve the physical address of EFI system table. + * + * @boot_params: pointer to boot_params + * @sys_table_pa: location to store physical address of system table + * @is_efi_64: location to store whether using 64-bit EFI or not + * + * Returns 0 on success. On error, return params are left unchanged. + */ +int +efi_bp_get_system_table(struct boot_params *boot_params, + unsigned long *sys_table_pa, bool *is_efi_64) +{ + unsigned long sys_table; + struct efi_info *ei; + bool efi_64; + char *sig; + + if (!sys_table_pa || !is_efi_64) + return -EINVAL; + + ei = &boot_params->efi_info; + sig = (char *)&ei->efi_loader_signature; + + if (!strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) { + efi_64 = true; + } else if (!strncmp(sig, EFI32_LOADER_SIGNATURE, 4)) { + efi_64 = false; + } else { + debug_putstr("Wrong EFI loader signature.\n"); + return -ENOENT; + } + + /* Get systab from boot params. */ +#ifdef CONFIG_X86_64 + sys_table = ei->efi_systab | ((__u64)ei->efi_systab_hi << 32); +#else + if (ei->efi_systab_hi || ei->efi_memmap_hi) { + debug_putstr("Error: EFI system table located above 4GB.\n"); + return -EINVAL; + } + sys_table = ei->efi_systab; +#endif + if (!sys_table) { + debug_putstr("EFI system table not found."); + return -ENOENT; + } + + *sys_table_pa = sys_table; + *is_efi_64 = efi_64; + return 0; +} + +/* + * Given boot_params, locate EFI system table from it and return the physical + * address EFI configuration table. + * + * @boot_params: pointer to boot_params + * @conf_table_pa: location to store physical address of config table + * @conf_table_len: location to store number of config table entries + * @is_efi_64: location to store whether using 64-bit EFI or not + * + * Returns 0 on success. On error, return params are left unchanged. + */ +int +efi_bp_get_conf_table(struct boot_params *boot_params, + unsigned long *conf_table_pa, + unsigned int *conf_table_len, + bool *is_efi_64) +{ + unsigned long sys_table_pa = 0; + int ret; + + if (!conf_table_pa || !conf_table_len || !is_efi_64) + return -EINVAL; + + ret = efi_bp_get_system_table(boot_params, &sys_table_pa, is_efi_64); + if (ret) + return ret; + + /* Handle EFI bitness properly */ + if (*is_efi_64) { + efi_system_table_64_t *stbl = + (efi_system_table_64_t *)sys_table_pa; + + *conf_table_pa = stbl->tables; + *conf_table_len = stbl->nr_tables; + } else { + efi_system_table_32_t *stbl = + (efi_system_table_32_t *)sys_table_pa; + + *conf_table_pa = stbl->tables; + *conf_table_len = stbl->nr_tables; + } + + return 0; +} diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index 822e0c254b9a..522baf8ff04a 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -174,4 +175,53 @@ void boot_stage2_vc(void); unsigned long sev_verify_cbit(unsigned long cr3); +#ifdef CONFIG_EFI +/* helpers for early EFI config table access */ +int efi_foreach_conf_entry(void *conf_table, unsigned int conf_table_len, + bool efi_64, + bool (*fn)(efi_guid_t guid, + unsigned long vendor_table_pa, + bool efi_64, + void *opaque), + void *opaque); + +int efi_bp_get_system_table(struct boot_params *boot_params, + unsigned long *sys_table_pa, + bool *is_efi_64); + +int efi_bp_get_conf_table(struct boot_params *boot_params, + unsigned long *conf_table_pa, + unsigned int *conf_table_len, + bool *is_efi_64); +#else +static inline int +efi_foreach_conf_entry(void *conf_table, unsigned int conf_table_len, + bool efi_64, + bool (*fn)(efi_guid_t guid, + unsigned long vendor_table_pa, + bool efi_64, + void *opaque), + void *opaque); +{ + return -ENOENT; +} + +static inline int +efi_bp_get_system_table(struct boot_params *boot_params, + unsigned long *sys_table_pa, + bool *is_efi_64) +{ + return -ENOENT; +} + +static inline int +efi_bp_get_conf_table(struct boot_params *boot_params, + unsigned long *conf_table_pa, + unsigned int *conf_table_len, + bool *is_efi_64) +{ + return -ENOENT; +} +#endif /* CONFIG_EFI */ + #endif /* BOOT_COMPRESSED_MISC_H */ -- 2.17.1