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x86/efi: Save and restore FPU context around efi_calls (x86_64)

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Do a complete FPU context save/restore around the EFI calls. This required
as runtime EFI firmware may potentially use the FPU.

This change covers only the x86_64 configuration.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Ricardo Neri 2014-03-27 15:10:42 -07:00 committed by Matt Fleming
parent 982e239cd2
commit de05764e0b
1 changed files with 3 additions and 0 deletions
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3
arch/x86/include/asm/efi.h
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@ -1,6 +1,7 @@
#ifndef _ASM_X86_EFI_H #ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H #define _ASM_X86_EFI_H
#include <asm/i387.h>
/* /*
* We map the EFI regions needed for runtime services non-contiguously, * We map the EFI regions needed for runtime services non-contiguously,
* with preserved alignment on virtual addresses starting from -4G down * with preserved alignment on virtual addresses starting from -4G down
@ -54,7 +55,9 @@ extern u64 asmlinkage efi_call(void *fp, ...);
\ \
efi_sync_low_kernel_mappings(); \ efi_sync_low_kernel_mappings(); \
preempt_disable(); \ preempt_disable(); \
__kernel_fpu_begin(); \
__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
__kernel_fpu_end(); \
preempt_enable(); \ preempt_enable(); \
__s; \ __s; \
}) })