On 10/06/20 22:51, Vivek Goyal wrote: >> KVM now supports using interrupt for 'page ready' APF event delivery and >> legacy mechanism was deprecated. Switch KVM guests to the new one. > Hi Vitaly, > > I see we have all this code in guest which tries to take care of > cases where PAGE_READY can be delivered before PAGE_NOT_PRESENT. In > this new schedume of things, can it still happen. We are using > an exception to deliver PAGE_NOT_PRESENT while using interrupt to > deliver PAGE_READY. > > If re-ordeing is not possible, then it will be good to get rid of > that extra complexity in guest. It is perhaps less likely but still possible, because the interrupt might be delivered to another CPU and race against the exception. Paolo
