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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>
This commit is contained in:
Julien Thierry 2019-01-31 14:58:49 +00:00 committed by Catalin Marinas
parent 85738e05dc
commit 13b210ddf4
2 changed files with 18 additions and 4 deletions
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17
drivers/firmware/efi/runtime-wrappers.c
View File

@ -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);
}
/*

5
include/linux/efi.h
View File

@ -1607,6 +1607,7 @@ efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
bool efi_runtime_disabled(void);
extern void efi_call_virt_check_flags(unsigned long flags, const char *call);
extern unsigned long efi_call_virt_save_flags(void);
enum efi_secureboot_mode {
efi_secureboot_mode_unset,
@ -1652,7 +1653,7 @@ void efi_retrieve_tpm2_eventlog(efi_system_table_t *sys_table);
\
arch_efi_call_virt_setup(); \
\
local_save_flags(__flags); \
__flags = efi_call_virt_save_flags(); \
__s = arch_efi_call_virt(p, f, args); \
efi_call_virt_check_flags(__flags, __stringify(f)); \
\
@ -1667,7 +1668,7 @@ void efi_retrieve_tpm2_eventlog(efi_system_table_t *sys_table);
\
arch_efi_call_virt_setup(); \
\
local_save_flags(__flags); \
__flags = efi_call_virt_save_flags(); \
arch_efi_call_virt(p, f, args); \
efi_call_virt_check_flags(__flags, __stringify(f)); \
\