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Commit de05764e authored by Ricardo Neri's avatar Ricardo Neri Committed by Matt Fleming
Browse files

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



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: default avatarRicardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 982e239c

arch/x86/include/asm/efi.h

+3 −0
Original line number Diff line number Diff line 
#ifndef _ASM_X86_EFI_H

#define _ASM_X86_EFI_H



#include <asm/i387.h>

/*

 * We map the EFI regions needed for runtime services non-contiguously,

 * 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();					\

	preempt_disable();						\

	__kernel_fpu_begin();						\

	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);	\

	__kernel_fpu_end();						\

	preempt_enable();						\

	__s;								\

})