On 15.11.2017 09:34, Paolo Bonzini wrote: > 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. > Seems to boil down to what Wanpeng Li asked about preempt notifiers in response to v2. -- Thanks, David / dhildenb
