Re: [Xen-devel] hvm_set_callback_irq_level() deadlock?

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Keir Fraser wrote:
> On 07/01/2009 10:22, "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx> wrote:
>
> > > Doesn't vioapic_irq_positive_edge() clearly expect to be called with that
> > > lock held?
> > I concern about that vioapic_deliver() calls vcpu_kick(). If vcpu0 has the
> > lock and
> > vcpu1 cannot get lock and spin then vcpu0 sleep in another function,
> > it may cause deadlock because vioapic_irq_positive_edge() may call
> > vcpu_kick().
> > For example, the following function is OK?
> I still don't see the problem. You'll have to spell out a concrete example,
> explaining where the two CPUs would be spinning and what state they're in
> (i.e, why they are depending on each other, and why no progress can be
> made).
I thought more. Sorry, I was wrong.

Best Regards,

Akio Takebe

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