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Re: [Xen-devel] hvm_set_callback_irq_level() deadlock?
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] hvm_set_callback_irq_level() deadlock? |
| From: | Akio Takebe <takebe_akio@xxxxxxxxxxxxxx> |
| Date: | Wed, 07 Jan 2009 21:58:58 +0900 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 07 Jan 2009 04:59:31 -0800 |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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