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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part1 v5 26/38] x86/compressed/acpi: move EFI config table access to common code Date: Fri, 20 Aug 2021 10:19:21 -0500 Message-Id: <20210820151933.22401-27-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820151933.22401-1-brijesh.singh@amd.com> References: <20210820151933.22401-1-brijesh.singh@amd.com> X-ClientProxiedBy: SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.19 via Frontend Transport; Fri, 20 Aug 2021 15:21:20 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b5a80506-7dce-4923-54f6-08d963ee2a31 X-MS-TrafficTypeDiagnostic: SN6PR12MB2638: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2276; 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dkim=pass header.d=amd.com header.s=selector1 header.b=WqimFakg; spf=pass (imf22.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.237.70 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 185CC1903 X-Stat-Signature: siyjwy5cc1yi3rq3onmr18go9wb9gemw X-HE-Tag: 1629472889-676361 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: 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 | 113 +++++-------------- arch/x86/boot/compressed/efi.c | 178 ++++++++++++++++++++++++++++++ arch/x86/boot/compressed/misc.h | 43 ++++++++ 4 files changed, 251 insertions(+), 84 deletions(-) create mode 100644 arch/x86/boot/compressed/efi.c diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 431bf7f846c3..d364192c2367 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) += $(obj)/efi.o efi-obj-$(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..3a3f997d7210 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -25,41 +25,22 @@ struct mem_vector immovable_mem[MAX_NUMNODES*2]; * ACPI_TABLE_GUID are found, take the former, which has more features. */ static acpi_physical_address -__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables, - bool efi_64) +__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_find_vendor_table(config_table_pa, config_table_len, + ACPI_20_TABLE_GUID, efi_64, + (unsigned long *)&rsdp_addr); + if (ret == -ENOENT) + ret = efi_find_vendor_table(config_table_pa, config_table_len, + ACPI_TABLE_GUID, efi_64, + (unsigned long *)&rsdp_addr); + if (ret) + debug_putstr("Error getting RSDP address.\n"); #endif return rsdp_addr; } @@ -87,7 +68,9 @@ 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 +81,16 @@ 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_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 +100,18 @@ 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_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.c b/arch/x86/boot/compressed/efi.c new file mode 100644 index 000000000000..16ff5cb9a1fb --- /dev/null +++ b/arch/x86/boot/compressed/efi.c @@ -0,0 +1,178 @@ +// 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; +} + +/** + * Given EFI config table, search it for the physical address of the vendor + * table associated with GUID. + * + * @conf_table: pointer to EFI configuration table + * @conf_table_len: number of entries in EFI configuration table + * @guid: GUID of vendor table + * @efi_64: true if using 64-bit EFI + * @vendor_table_pa: location to store physical address of vendor table + * + * Returns 0 on success. On error, return params are left unchanged. + */ +int +efi_find_vendor_table(unsigned long conf_table_pa, unsigned int conf_table_len, + efi_guid_t guid, bool efi_64, + unsigned long *vendor_table_pa) +{ + unsigned int i; + + for (i = 0; i < conf_table_len; i++) { + unsigned long vendor_table_pa_tmp; + efi_guid_t vendor_table_guid; + int ret; + + if (get_vendor_table((void *)conf_table_pa, i, + &vendor_table_pa_tmp, + &vendor_table_guid, efi_64)) + return -EINVAL; + + if (!efi_guidcmp(guid, vendor_table_guid)) { + *vendor_table_pa = vendor_table_pa_tmp; + return 0; + } + } + + return -ENOENT; +} + +/** + * 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_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_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_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..16b092fd7aa1 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 +175,46 @@ 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_find_vendor_table(unsigned long conf_table_pa, unsigned int conf_table_len, + efi_guid_t guid, bool efi_64, + unsigned long *vendor_table_pa); + +int efi_get_system_table(struct boot_params *boot_params, + unsigned long *sys_table_pa, + bool *is_efi_64); + +int efi_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_find_vendor_table(unsigned long conf_table_pa, unsigned int conf_table_len, + efi_guid_t guid, bool efi_64, + unsigned long *vendor_table_pa) +{ + return -ENOENT; +} + +static inline int +efi_get_system_table(struct boot_params *boot_params, + unsigned long *sys_table_pa, + bool *is_efi_64) +{ + return -ENOENT; +} + +static inline int +efi_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 */