Re: [v3 24/26] KVM: Update Posted-Interrupts Descriptor when vCPU is blocked

[Paolo Bonzini]

On 12/12/2014 16:14, Feng Wu wrote:
> This patch updates the Posted-Interrupts Descriptor when vCPU
> is blocked.
> 
> pre-block:
> - Add the vCPU to the blocked per-CPU list
> - Clear 'SN'

Should SN be already clear (and NV set to POSTED_INTR_VECTOR)?  Can it
happen that you go from sched-out to blocked without doing a sched-in first?

In fact, if this is possible, what happens if vcpu->preempted &&
vcpu->blocked?

> - Set 'NV' to POSTED_INTR_WAKEUP_VECTOR
> 
> post-block:
> - Remove the vCPU from the per-CPU list

Paolo

> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
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