RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug bug

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Liu, Jinsong writes ("RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug bug"):
> I think qemu-xen should add this logic level, so that it can support
> more gpe events in the future.

Yes.  But what clears the interrupt ?  Is it edge or level triggered ?

> BTW, at qemu-kvm, it do same as our current patch:
>          qemu_set_irq(sci_irq, 1);
>          qemu_set_irq(sci_irq, 0);
> it triggers a sci pulse and works fine.

If this works fine it is just lucky, I think.  It has the same race as
the one you've identified.  Batching up the different events is just a
way to make the race probably not happen in that particular case.

Ian.

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