Re: [tip:x86/efi] x86/efi: Check for unsafe dealing with FPU state in irq ctxt

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On 06/05/2014 09:37 AM, Borislav Petkov wrote:
> On Thu, Jun 05, 2014 at 09:31:12AM -0700, H. Peter Anvin wrote:
>> The bottom line is that we can't call EFI from a context where we can't
>> use the FPU.  Or specifically, we can't then resume execution.
> 
> Can't we allocate a save-state area, stash the state there and let EFI
> scribble over it? When EFI returns, we scribble over it back assuming it
> has done the saving/restoring on its own.

I'm sorry I don't follow.

	-hpa

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