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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] IRQ SMP affinity problems in domU with vcpus > 4 on HP ProLiant G6 with dual Xeon 5540 (Nehalem)
On 16/10/2009 09:35, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx> wrote: >>> That maybe a problem if so. If a malicious/buggy guest won't EOI the >>> MSI vector, so host may hang due to lack of timeout mechanism? >> >> Why does host hang? Only the assigned interrupt will block, and that's >> exactly what the guest wants :-) > > Hypervisor shouldn't EOI the real vector until guest EOI the corresponding > virtual vector , right ? Not sure.:-) If the EOI is via the local APIC, which I suppose it must be, then a timeout fallback probably is required. This is because priorities are assigned arbitrarily to guest interrupts, and a non-EOIed interrupt blocks any lower-priority interrupts. In particular, some of those could be owned by dom0 for example, and be quite critical to forward progress of the entire system. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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