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x86/efi: Force EFI reboot to process pending capsules 

If an EFI capsule has been sent to the firmware we must match the type
of EFI reset against that required by the capsule to ensure it is
processed correctly.

Force an EFI reboot if a capsule is pending for the next reset.

Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kweh Hock Leong <hock.leong.kweh@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: joeyli <jlee@suse.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-29-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Matt Fleming 2016-04-25 21:07:00 +01:00 committed by Ingo Molnar
parent f0133f3c5b
commit 87615a34d5
2 changed files with 15 additions and 0 deletions
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9
arch/x86/kernel/reboot.c
View File

@ -535,6 +535,15 @@ static void native_machine_emergency_restart(void)
mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
*((unsigned short *)__va(0x472)) = mode;
/*
* If an EFI capsule has been registered with the firmware then
* override the reboot= parameter.
*/
if (efi_capsule_pending(NULL)) {
pr_info("EFI capsule is pending, forcing EFI reboot.\n");
reboot_type = BOOT_EFI;
}
for (;;) {
/* Could also try the reset bit in the Hammer NB */
switch (reboot_type) {

6
include/linux/efi.h
View File

@ -1085,6 +1085,12 @@ static inline bool efi_enabled(int feature)
}
static inline void
efi_reboot(enum reboot_mode reboot_mode, const char *__unused) {}
static inline bool
efi_capsule_pending(int *reset_type)
{
return false;
}
#endif
extern int efi_status_to_err(efi_status_t status);