From a7012bdbdf406bbaa4e3de0cc3d8eb0faaacbf93 Mon Sep 17 00:00:00 2001 From: Daniel Kiper Date: Fri, 4 May 2018 07:59:47 +0200 Subject: x86/xen/efi: Initialize UEFI secure boot state during dom0 boot Initialize UEFI secure boot state during dom0 boot. Otherwise the kernel may not even know that it runs on secure boot enabled platform. Note that part of drivers/firmware/efi/libstub/secureboot.c is duplicated by this patch, only in this case, it runs in the context of the kernel proper rather than UEFI boot context. The reason for the duplication is that maintaining the original code to run correctly on ARM/arm64 as well as on all the quirky x86 firmware we support is enough of a burden as it is, and adding the x86/Xen execution context to that mix just so we can reuse a single routine just isn't worth it. [ardb: explain rationale for code duplication] Signed-off-by: Daniel Kiper Signed-off-by: Ard Biesheuvel Cc: Linus Torvalds Cc: Matt Fleming Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20180504060003.19618-2-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar --- drivers/firmware/efi/libstub/secureboot.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/firmware') diff --git a/drivers/firmware/efi/libstub/secureboot.c b/drivers/firmware/efi/libstub/secureboot.c index 8f07eb414c00..72d9dfbebf08 100644 --- a/drivers/firmware/efi/libstub/secureboot.c +++ b/drivers/firmware/efi/libstub/secureboot.c @@ -30,6 +30,9 @@ static const efi_char16_t shim_MokSBState_name[] = L"MokSBState"; /* * Determine whether we're in secure boot mode. + * + * Please keep the logic in sync with + * arch/x86/xen/efi.c:xen_efi_get_secureboot(). */ enum efi_secureboot_mode efi_get_secureboot(efi_system_table_t *sys_table_arg) { -- cgit v1.2.3