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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>
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@ -1,6 +1,7 @@
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#ifndef _ASM_X86_EFI_H
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#define _ASM_X86_EFI_H
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#include <asm/i387.h>
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/*
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* We map the EFI regions needed for runtime services non-contiguously,
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* with preserved alignment on virtual addresses starting from -4G down
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@ -54,7 +55,9 @@ extern u64 asmlinkage efi_call(void *fp, ...);
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\
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efi_sync_low_kernel_mappings(); \
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preempt_disable(); \
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__kernel_fpu_begin(); \
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__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
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__kernel_fpu_end(); \
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preempt_enable(); \
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__s; \
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})
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