Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [patch 13/31] x86/fpu: Move KVMs FPU swapping to FPU core | Date | Tue, 12 Oct 2021 20:25:48 +0200 |
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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
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