iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

efi/libstub: Add generic support for parsing mem_encrypt=

Browse Source 
Parse the mem_encrypt= command line parameter from the EFI stub if
CONFIG_ARCH_HAS_MEM_ENCRYPT=y, so that it can be passed to the early
boot code by the arch code in the stub.

This avoids the need for the core kernel to do any string parsing very
early in the boot.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240227151907.387873-16-ardb+git@google.com
This commit is contained in:
Ard Biesheuvel 2024-02-27 16:19:13 +01:00 committed by Borislav Petkov (AMD)
parent 8282639576
commit 7205f06e84
2 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/firmware/efi/libstub/efi-stub-helper.c
View File

@ -24,6 +24,8 @@ static bool efi_noinitrd;
static bool efi_nosoftreserve;
static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
int efi_mem_encrypt;
bool __pure __efi_soft_reserve_enabled(void)
{
return !efi_nosoftreserve;
@ -75,6 +77,12 @@ efi_status_t efi_parse_options(char const *cmdline)
efi_noinitrd = true;
} else if (IS_ENABLED(CONFIG_X86_64) && !strcmp(param, "no5lvl")) {
efi_no5lvl = true;
} else if (IS_ENABLED(CONFIG_ARCH_HAS_MEM_ENCRYPT) &&
!strcmp(param, "mem_encrypt") && val) {
if (parse_option_str(val, "on"))
efi_mem_encrypt = 1;
else if (parse_option_str(val, "off"))
efi_mem_encrypt = -1;
} else if (!strcmp(param, "efi") && val) {
efi_nochunk = parse_option_str(val, "nochunk");
efi_novamap |= parse_option_str(val, "novamap");

2
drivers/firmware/efi/libstub/efistub.h
View File

@ -37,8 +37,8 @@ extern bool efi_no5lvl;
extern bool efi_nochunk;
extern bool efi_nokaslr;
extern int efi_loglevel;
extern int efi_mem_encrypt;
extern bool efi_novamap;
extern const efi_system_table_t *efi_system_table;
typedef union efi_dxe_services_table efi_dxe_services_table_t;