Messages in this thread | | | Date | Wed, 18 Jul 2007 17:47:36 +0100 | From | Alan Cox <> | Subject | Re: [kvm-devel] [RFC] Deferred interrupt handling. |
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> What if we will force the specific device to the end of the list. Once > IRQ_NONE was returned by the other devices, we will mask the irq, > forward the irq to the guest, issue a timer for 1msec. Motivation: > 1msec is long enough for the guest to ack the irq + host unmask the irq
It makes no difference. The deadlock isn't fixable by timing hacks. Consider the following sequence
Guest0 - blocked on I/O
IRQ14 from your hardware Block IRQ14 Sent to guest (guest is blocked)
IRQ14 from hard disk Ignored (as blocked)
Deadlock
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