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>

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index ab0adc0fa5db4da281de34e46c71e2cfbb707c07..a9b31eb815f23e93eae56960879448d7a63fba09 100644 (file)
--- 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) {

diff --git a/include/linux/efi.h b/include/linux/efi.h
index a3b4c1ec38c074bc1e1bf2a89db5adb043404352..aa36fb8bea4befcd1e06601f4b69a86b6fc4fcde 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -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);