Re: [Xen-devel] [PATCH 0/6] MSI-INTx interrupt translation for HVM

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 02/03/2009 09:24, "Qing He" <qing.he@xxxxxxxxx> wrote:

>> Ah, well the passthrough-specific logic is not something I'm so familiar
>> with! That above code indeed doesn't look correct. :-)
> 
> I recently learned that some device may keep issuing MSI until it is
> explicitly
> cleared by software. In that case it just behaves like level-triggered
> interrupt, and doing something like the code above will cause interrupt storm.
> This is reflected in cs. 19065.
> 
> Do you mean this issue?

That would be the expected result of early EOI, yes. But Shohei was walking
about losing interrupts. I don't know how we would do that.

 -- Keir



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