On Mon, 2018-06-18 at 14:33 -0700, Andy Lutomirski wrote: > When KVM host support goes in, even this won't be good enough if we > want to allow passthrough access to the MSRs because we will no longer > be able to guarantee that all zeros is invalid. Instead we'd need an > actual flag saying that the cache is invalid. I'm not sure if I understood this part. If it was pass-through, and there was a flag, how that flag in the host would get updated? /Jarkko