On 14/03/2017 22:52, Radim Krčmář wrote: >> If my statement above about needing interrupts disabled when dealing >> with vtime, then considering this begins to sound interesting, also >> given that the vtime thing is not entirely free and we're dealing with >> the hot path of receiving IPIs here, for example. > I'm liking it less and less the more I read. :) > CONTEXT_USER vtime is coupled with context tracking and going out of > CONTEXT_KERNEL means that RCU cannot be used in between. Using > CONTEXT_GUEST from load/put would change the meaning of contexts ... CONTEXT_GUEST is an RCU extended quiescent state, doing it from load to put makes no sense. PF_VCPU from load to put on the other hand might make some sense. Paolo
