Re: [PATCH] x86,kvm: move qemu/guest FPU switching out to vcpu_run

[Paolo Bonzini]

On 14/11/2017 20:40, David Hildenbrand wrote:
> I think we should check all get/put_fpu callers if they need
> preempt_disable().
> 
> E.g. em_fxrstor() needs disabled preemption as we temporarily
> save + restore some host register (via fxsave + fxrstor) under some
> circumstances that are not saved/restored when switching to/back from
> another process. We should double check.

Rik may correct me, but I believe that you don't need
preempt_disable/enable because preempt notifiers do this for you.

Paolo