[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 5/5] xen/arm: Only enable physical IRQs when the guest asks
On Tue, 25 Jun 2013, Julien Grall wrote: > On 06/25/2013 05:19 PM, Stefano Stabellini wrote: > > > On Tue, 25 Jun 2013, Julien Grall wrote: > >> If the guest VCPU receives an interrupts when it's disabled, it will throw > > ^interrupt > > > >> away the IRQ with EOIed it. > > > > What does this mean? I cannot parse the sentence. > > "it will throw away the IRQ without EOIing". > > > > >> This is result to lost IRQ forever. > >> Directly EOIed the interrupt doesn't help because the IRQ could be fired > >> again and result to an infinited loop. > >> > >> It happens during dom0 boot on the versatile express TC2 with the ethernet > >> card. > >> > >> Let the interrupt disabled when Xen setups the route and enable it when > >> Linux > >> asks to enable it. > > > > Is the problem that Xen keeps the interrupt enabled even when Linux > > disables it at the gic level? Is this what this patch is trying to > > address? > > This patch only delays the physical IRQ activation until Linux will > enable it. This patch avoids to lose IRQ when a VCPU is disabled. > > I tried to also disable the IRQ when Linux asks to disable it but the > versatile express platform hang. do you know why? and the arndale? _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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