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

[H. Peter Anvin]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/