Re: [PATCH v2 2/3] KVM: VMX: Do not change PID.NDST when loading a blocked vCPU

[Wanpeng Li]

On Tue, 12 Nov 2019 at 01:23, Joao Martins <joao.m.martins@xxxxxxxxxx> wrote:
>
> While vCPU is blocked (in kvm_vcpu_block()), it may be preempted which
> will cause vmx_vcpu_pi_put() to set PID.SN.  If later the vCPU will be

How can this happen? See the prepare_to_swait_exlusive() in
kvm_vcpu_block(), the task will be set in TASK_INTERRUPTIBLE state,
kvm_sched_out will set vcpu->preempted to true iff current->state ==
TASK_RUNNING.

    Wanpeng