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?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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