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authorMatt Fleming <matt@codeblueprint.co.uk>2016-04-25 21:07:00 +0100
committerIngo Molnar <mingo@kernel.org>2016-04-28 11:34:04 +0200
commit87615a34d561ef59bd0cffc73256a21220dfdffd (patch)
tree0dc34d3b26283fd27e66affb678d52def0904fdf /arch/x86/kernel/reboot.c
parentf0133f3c5b8bb34ec4dec50c27e7a655aeee8935 (diff)
downloadlinux-87615a34d561ef59bd0cffc73256a21220dfdffd.tar.bz2
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>
Diffstat (limited to 'arch/x86/kernel/reboot.c')
-rw-r--r--arch/x86/kernel/reboot.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index ab0adc0fa5db..a9b31eb815f2 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -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) {