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efi: libstub: install boot-time memory map as config table

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Expose the EFI boot time memory map to the kernel via a configuration
table. This is arch agnostic and enables future changes that remove the
dependency on DT on architectures that don't otherwise rely on it.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-09-15 23:20:06 +02:00
parent 4fc8e738ff
commit 171539f5a9
7 changed files with 31 additions and 8 deletions
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2
drivers/firmware/efi/libstub/arm64-stub.c
View File

@ -47,7 +47,7 @@ static bool check_image_region(u64 base, u64 size)
bool ret = false;
int map_offset;
status = efi_get_memory_map(&map);
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
return false;

2
drivers/firmware/efi/libstub/efi-stub-helper.c
View File

@ -437,7 +437,7 @@ efi_status_t efi_exit_boot_services(void *handle, void *priv,
struct efi_boot_memmap *map;
efi_status_t status;
status = efi_get_memory_map(&map);
status = efi_get_memory_map(&map, true);
if (status != EFI_SUCCESS)
return status;

3
drivers/firmware/efi/libstub/efistub.h
View File

@ -876,7 +876,8 @@ void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_si
char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len);
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map);
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
bool install_cfg_tbl);
efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
unsigned long max);

27
drivers/firmware/efi/libstub/mem.c
View File

@ -9,14 +9,20 @@
* efi_get_memory_map() - get memory map
* @map: pointer to memory map pointer to which to assign the
* newly allocated memory map
* @install_cfg_tbl: whether or not to install the boot memory map as a
* configuration table
*
* Retrieve the UEFI memory map. The allocated memory leaves room for
* up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.
*
* Return: status code
*/
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map)
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
bool install_cfg_tbl)
{
int memtype = install_cfg_tbl ? EFI_ACPI_RECLAIM_MEMORY
: EFI_LOADER_DATA;
efi_guid_t tbl_guid = LINUX_EFI_BOOT_MEMMAP_GUID;
struct efi_boot_memmap *m, tmp;
efi_status_t status;
unsigned long size;
@ -28,20 +34,35 @@ efi_status_t efi_get_memory_map(struct efi_boot_memmap **map)
return EFI_LOAD_ERROR;
size = tmp.map_size + tmp.desc_size * EFI_MMAP_NR_SLACK_SLOTS;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*m) + size,
status = efi_bs_call(allocate_pool, memtype, sizeof(*m) + size,
(void **)&m);
if (status != EFI_SUCCESS)
return status;
if (install_cfg_tbl) {
/*
* Installing a configuration table might allocate memory, and
* this may modify the memory map. This means we should install
* the configuration table first, and re-install or delete it
* as needed.
*/
status = efi_bs_call(install_configuration_table, &tbl_guid, m);
if (status != EFI_SUCCESS)
goto free_map;
}
m->buff_size = m->map_size = size;
status = efi_bs_call(get_memory_map, &m->map_size, m->map, &m->map_key,
&m->desc_size, &m->desc_ver);
if (status != EFI_SUCCESS)
goto free_map;
goto uninstall_table;
*map = m;
return EFI_SUCCESS;
uninstall_table:
if (install_cfg_tbl)
efi_bs_call(install_configuration_table, &tbl_guid, NULL);
free_map:
efi_bs_call(free_pool, m);
return status;

2
drivers/firmware/efi/libstub/randomalloc.c
View File

@ -61,7 +61,7 @@ efi_status_t efi_random_alloc(unsigned long size,
efi_status_t status;
int map_offset;
status = efi_get_memory_map(&map);
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
return status;

2
drivers/firmware/efi/libstub/relocate.c
View File

@ -28,7 +28,7 @@ efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
unsigned long nr_pages;
int i;
status = efi_get_memory_map(&map);
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
goto fail;

1
include/linux/efi.h
View File

@ -410,6 +410,7 @@ void efi_native_runtime_setup(void);
#define LINUX_EFI_INITRD_MEDIA_GUID EFI_GUID(0x5568e427, 0x68fc, 0x4f3d, 0xac, 0x74, 0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
#define LINUX_EFI_MOK_VARIABLE_TABLE_GUID EFI_GUID(0xc451ed2b, 0x9694, 0x45d3, 0xba, 0xba, 0xed, 0x9f, 0x89, 0x88, 0xa3, 0x89)
#define LINUX_EFI_COCO_SECRET_AREA_GUID EFI_GUID(0xadf956ad, 0xe98c, 0x484c, 0xae, 0x11, 0xb5, 0x1c, 0x7d, 0x33, 0x64, 0x47)
#define LINUX_EFI_BOOT_MEMMAP_GUID EFI_GUID(0x800f683f, 0xd08b, 0x423a, 0xa2, 0x93, 0x96, 0x5c, 0x3c, 0x6f, 0xe2, 0xb4)
#define RISCV_EFI_BOOT_PROTOCOL_GUID EFI_GUID(0xccd15fec, 0x6f73, 0x4eec, 0x83, 0x95, 0x3e, 0x69, 0xe4, 0xb9, 0x40, 0xbf)