Re: [Xen-devel] [PATCH v2] x86/passthrough: fix migration of MSI when using posted interrupts

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Oct 30, 2019 at 09:38:16AM -0700, Joe Jin wrote:
> On 10/30/19 1:24 AM, Roger Pau Monné wrote:
> > Can you try to add the following debug patch on top of the existing
> > one and report the output that you get on the Xen console?
> 
> Applied debug patch and run the test again, not of any log printed,
> attached Xen log on serial console, seems pi_update_irte() not been
> called for iommu_intpost was false.

I have to admit I'm lost at this point. Does it mean the original
issue had nothing to do with posted interrupts?

Where you booting using iommu=intpost in your previous tests? Note
that posted interrupts is not enabled by default according to the
command line documentation.

Can you confirm whether you also see weird behavior without using
posted interrupts, and can you turn posted interrupts on and give the
patch a try?

Thanks, Roger.

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