Re: [Xen-devel] Re: [PATCH] xen: events: do not unmask polled ipis on restore.

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

 On 10/29/2010 10:35 AM, Ian Campbell wrote:
> On Fri, 2010-10-29 at 17:44 +0100, Jeremy Fitzhardinge wrote:
>> On 10/29/2010 01:33 AM, Ian Campbell wrote:
>>> The Xen PV spinlock backend attempts to setup an IPI to IRQ binding
>>> which is only to be used via xen_poll_irq rather received directly.
>>>
>>> Unfortunately restore_cpu_ipis unconditionally unmasks each IPI
>>> leading to:
>> Gosh I wonder why we hadn't seen this before?
> I must admit I don't normally enable CONFIG_PARAVIRT_SPINLOCKS I
> happened to be running someone else's config when I noticed this.
>
> Possibly relates to switching to the edge triggered handler and the
> related mask/unmask vs clear etc frobbing?

Possibly.  Did you see my comment further down?

    J

>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel