From 6bbeb276b71f06c5267bfd154629b1bec82e7136 Mon Sep 17 00:00:00 2001 From: Kairui Song Date: Mon, 29 Apr 2019 08:23:18 +0800 Subject: [PATCH] x86/kexec: Add the EFI system tables and ACPI tables to the ident map Currently, only the whole physical memory is identity-mapped for the kexec kernel and the regions reserved by firmware are ignored. However, the recent addition of RSDP parsing in the decompression stage and especially: 33f0df8d843d ("x86/boot: Search for RSDP in the EFI tables") which tries to access EFI system tables and to dig out the RDSP address from there, becomes a problem because in certain configurations, they might not be mapped in the kexec'ed kernel's address space. What is more, this problem doesn't appear on all systems because the kexec kernel uses gigabyte pages to build the identity mapping. And the EFI system tables and ACPI tables can, depending on the system configuration, end up being mapped as part of all physical memory, if they share the same 1 GB area with the physical memory. Therefore, make sure they're always mapped. [ bp: productize half-baked patch: - rewrite commit message. - correct the map_acpi_tables() function name in the !ACPI case. ] Signed-off-by: Kairui Song Signed-off-by: Baoquan He Signed-off-by: Borislav Petkov Tested-by: Dirk van der Merwe Cc: dyoung@redhat.com Cc: fanc.fnst@cn.fujitsu.com Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: j-nomura@ce.jp.nec.com Cc: kexec@lists.infradead.org Cc: "Kirill A. Shutemov" Cc: Lianbo Jiang Cc: Tetsuo Handa Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/20190429002318.GA25400@MiWiFi-R3L-srv --- arch/x86/kernel/machine_kexec_64.c | 75 ++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index ceba408ea982..3c77bdf7b32a 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -29,6 +30,43 @@ #include #include +#ifdef CONFIG_ACPI +/* + * Used while adding mapping for ACPI tables. + * Can be reused when other iomem regions need be mapped + */ +struct init_pgtable_data { + struct x86_mapping_info *info; + pgd_t *level4p; +}; + +static int mem_region_callback(struct resource *res, void *arg) +{ + struct init_pgtable_data *data = arg; + unsigned long mstart, mend; + + mstart = res->start; + mend = mstart + resource_size(res) - 1; + + return kernel_ident_mapping_init(data->info, data->level4p, mstart, mend); +} + +static int +map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p) +{ + unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY; + struct init_pgtable_data data; + + data.info = info; + data.level4p = level4p; + flags = IORESOURCE_MEM | IORESOURCE_BUSY; + return walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1, + &data, mem_region_callback); +} +#else +static int map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p) { return 0; } +#endif + #ifdef CONFIG_KEXEC_FILE const struct kexec_file_ops * const kexec_file_loaders[] = { &kexec_bzImage64_ops, @@ -36,6 +74,31 @@ const struct kexec_file_ops * const kexec_file_loaders[] = { }; #endif +static int +map_efi_systab(struct x86_mapping_info *info, pgd_t *level4p) +{ +#ifdef CONFIG_EFI + unsigned long mstart, mend; + + if (!efi_enabled(EFI_BOOT)) + return 0; + + mstart = (boot_params.efi_info.efi_systab | + ((u64)boot_params.efi_info.efi_systab_hi<<32)); + + if (efi_enabled(EFI_64BIT)) + mend = mstart + sizeof(efi_system_table_64_t); + else + mend = mstart + sizeof(efi_system_table_32_t); + + if (!mstart) + return 0; + + return kernel_ident_mapping_init(info, level4p, mstart, mend); +#endif + return 0; +} + static void free_transition_pgtable(struct kimage *image) { free_page((unsigned long)image->arch.p4d); @@ -159,6 +222,18 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable) return result; } + /* + * Prepare EFI systab and ACPI tables for kexec kernel since they are + * not covered by pfn_mapped. + */ + result = map_efi_systab(&info, level4p); + if (result) + return result; + + result = map_acpi_tables(&info, level4p); + if (result) + return result; + return init_transition_pgtable(image, level4p); } -- 2.30.2