From de05764e0b2a3d9559e099a2e134f8cef4500fdd Mon Sep 17 00:00:00 2001 From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Date: Thu, 27 Mar 2014 15:10:42 -0700 Subject: [PATCH] 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: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com> --- arch/x86/include/asm/efi.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index 19292e7cae580..0b19187cc8826 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -1,6 +1,7 @@ #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; \ }) -- GitLab