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efi/libstub: Add generic support for parsing mem_encrypt=

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BugLink: https://bugs.launchpad.net/bugs/2065400

commit 7205f06e847422b66c1506eee01b9998ffc75d76 upstream.

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
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Ard Biesheuvel
2024-02-27 16:19:13 +01:00
committed by Stefan Bader
parent 7b22adc276
commit c3a87d97c0
2 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/firmware/efi/libstub/efi-stub-helper.c
+8
View File
@@ -25,6 +25,8 @@ 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;
@@ -76,6 +78,12 @@ 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");
drivers/firmware/efi/libstub/efistub.h
+1 -1
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;