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

[Thomas Gleixner]

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