On 16/11/2017 06:06, Quan Xu wrote: > when vcpu thread is scheduled out, the pkru value in > current->thread.fpu.state may be the host pkru value, instead of > guest pkru value (of course, this _assumes_ that the pkru is in > current->thread.fpu.state as well). in this way, the pkru may be a > coner case. Rik may correct me, but I think this is not possible. Preemption is disabled all the time while PKRU = guest_pkru (which is only during vmx_vcpu_run). Context switching will only happen in vcpu_enter_guest() after preempt_enable() for a preemptible kernel, or in vcpu_run via cond_resched() for a non-preemptible kernel. Thanks, Paolo > > VM migration again, in case, > source_host_pkru_value != guest_pkru_value, > target_host_pkru_value == guest_pkru_value.. > > the pkru status would be inconsistent..
