Re: [patch 13/31] x86/fpu: Move KVMs FPU swapping to FPU core

Thomas Gleixner
2021-10-12T18:26:09Z

On Tue, Oct 12 2021 at 18:53, Borislav Petkov wrote:
> On Tue, Oct 12, 2021 at 02:00:17AM +0200, Thomas Gleixner wrote:
>> /*
>> - * Guests with protected state can't have it set by the hypervisor,
>> - * so skip trying to set it.
>> + * Guest with protected state have guest_fpu == NULL which makes
>
> "Guests ... "
>
>> + * the swap only safe the host state. Exclude PKRU from restore as
>
> "save"

No I meant safe, but let me rephrase it, Swap does both save and
restore. But it's not safe to dereference a NULL pointer :)

.... makes the swap only handle the host state. Exclude PKRU from restore as

Thanks,

tglx