Messages in this thread | | | Date | Mon, 9 Mar 2020 21:22:15 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2] x86/kvm: Disable KVM_ASYNC_PF_SEND_ALWAYS |
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On Mon, Mar 09, 2020 at 08:05:18PM +0100, Thomas Gleixner wrote: > Andy Lutomirski <luto@kernel.org> writes:
> > I'm okay with the save/restore dance, I guess. It's just yet more > > entry crud to deal with architecture nastiness, except that this > > nastiness is 100% software and isn't Intel/AMD's fault. > > And we can do it in C and don't have to fiddle with it in the ASM > maze.
Right; I'd still love to kill KVM_ASYNC_PF_SEND_ALWAYS though, even if we do the save/restore in do_nmi(). That is some wild brain melt. Also, AFAIK none of the distros are actually shipping a PREEMPT=y kernel anyway, so killing it shouldn't matter much.
If people want to recover that, I'd suggest they sit down and create a sane paravirt interface for this.
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