Re: [PATCH 0/2] kvm: fix spurious interrupt with irqfd

From: Michael S. Tsirkin
Date: Wed Jan 20 2010 - 10:13:05 EST

On Wed, Jan 20, 2010 at 05:09:32PM +0200, Avi Kivity wrote:
> On 01/20/2010 04:58 PM, Michael S. Tsirkin wrote:
>>> I'm uncomfortable with pushing Davide's patch into stable and possibly
>>> causing regressions with unrelated applications. Can't a guest live
>>> with a spurious interrupt?
>> Well guests mask/unmask vector on each interrupt, so this will trigger
>> an irq storm I think.
>>> It's not like they're unknown.
>> Depends on the device really.
>> In theory, if they trigger at an unfortunate time this could cause
>> crashes.
> I'd like confirmation on both of these before I push things to stable.

I have observed the interrupt storm. We end up with interrupt being
disabled. Crash is a theoretical issue.

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