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| author | Julien Thierry <julien.thierry@arm.com> | 2019-01-31 15:58:49 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2019-02-06 11:05:19 +0100 |
| commit | 13b210ddf474d9f3368766008a89fe82a6f90b48 (patch) | |
| tree | da5655d9ca58bfbd215634df7ec9064242846a8c /drivers | |
| parent | arm64: kvm: Unmask PMR before entering guest (diff) | |
| download | linux-13b210ddf474d9f3368766008a89fe82a6f90b48.tar.xz linux-13b210ddf474d9f3368766008a89fe82a6f90b48.zip | |
efi: Let architectures decide the flags that should be saved/restored
Currently, irqflags are saved before calling runtime services and
checked for mismatch on return.
Provide a pair of overridable macros to save and restore (if needed) the
state that need to be preserved on return from a runtime service.
This allows to check for flags that are not necesarly related to
irqflags.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-efi@vger.kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/efi/runtime-wrappers.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index 8903b9ccfc2b..c70df5ae7c4a 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -89,11 +89,24 @@ exit: \ efi_rts_work.status; \ }) +#ifndef arch_efi_save_flags +#define arch_efi_save_flags(state_flags) local_save_flags(state_flags) +#define arch_efi_restore_flags(state_flags) local_irq_restore(state_flags) +#endif + +unsigned long efi_call_virt_save_flags(void) +{ + unsigned long flags; + + arch_efi_save_flags(flags); + return flags; +} + void efi_call_virt_check_flags(unsigned long flags, const char *call) { unsigned long cur_flags, mismatch; - local_save_flags(cur_flags); + cur_flags = efi_call_virt_save_flags(); mismatch = flags ^ cur_flags; if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK)) @@ -102,7 +115,7 @@ void efi_call_virt_check_flags(unsigned long flags, const char *call) add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE); pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n", flags, cur_flags, call); - local_irq_restore(flags); + arch_efi_restore_flags(flags); } /* |