On Monday 04 May 2009 16:25:55 Avi Kivity wrote:
> Sheng Yang wrote:
> > Disable interrupt at interrupt handler and enable it when guest ack is
> > for the level triggered interrupt, to prevent reinjected interrupt.
> > MSI/MSI-X don't need it.
> >
> > One possible problem is multiply same vector interrupt injected between
> > irq handler and scheduled work handler would be merged as one for
> > MSI/MSI-X. But AFAIK, the drivers handle it well.
> >
> > The patch fixed the oplin card performance issue(MSI-X performance is
> > half of MSI/INTx).
> >
> >
> > schedule_work(&assigned_dev->interrupt_work);
> >
> > - disable_irq_nosync(irq);
> > - assigned_dev->host_irq_disabled = true;
> > + if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
> > + disable_irq_nosync(irq);
> > + assigned_dev->host_irq_disabled = true;
> > + }
> >
> > out:
> > spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
>
> I don't have the spin_lock_irqrestore() here. The patch applies, but
> with fuzz. Am I missing a patch?
Oh, it's Marcelo's patchset...
[patch 0/4] use smp_send_reschedule in vcpu_kick / assigned dev host intx race
fix
--
regards
Yang, Sheng
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