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Re: [Xen-devel] Interrupt synchronisation and HVM
| To: | James Harper <james.harper@xxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Interrupt synchronisation and HVM |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 25 Jul 2008 08:09:18 +0100 |
| Cc: | |
| Delivery-date: | Fri, 25 Jul 2008 00:10:02 -0700 |
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| Thread-topic: | [Xen-devel] Interrupt synchronisation and HVM |
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On 25/7/08 08:02, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote: > Just to clarify, if I have masked the interrupts via > HVM_PARAM_CALLBACK_IRQ = 0, it is safe to do nothing when the interrupt > occurs right? I don't need to unset the 'pending' bits or anything? Yes, as soon as HVM_PARAM_CALLBACK_IRQ=0 the 'interrupt wire' is de-asserted. You only get a single spurious interrupt if the wire status was latched by the PIC or IO-APIC before you cleared HVM_PARAM_CALLBACK_IRQ. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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