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Re: dom0 PVH: 'entry->arch.pirq != INVALID_PIRQ' failed at vmsi.c:843
- To: Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 13 Nov 2020 15:33:49 +0100
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- Delivery-date: Fri, 13 Nov 2020 14:34:03 +0000
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On Fri, Nov 13, 2020 at 12:54:57PM +0100, Manuel Bouyer wrote:
> On Thu, Nov 12, 2020 at 09:19:39PM +0100, Roger Pau Monné wrote:
> > The following might be able to get you going, but I think I need to
> > refine the logic a bit there, will have to give it some thought.
>
> I also tested with xen devel (Xen version 4.15-unstable, Latest ChangeSet:
> Wed Nov 4 09:27:22 2020 +0100 git:9ff9705647-dirty).
> Your patch is needed there too to avoid the panic.
>
> As with 4.13, I have problems with interrupts not being properly
> delivered. The strange thing is that the counter is not 0, but 3 (wuth 4.13)
> or 2 (with 4.15) which would mean that interrupts stop being delivered
> at some point in the setup process. Maybe something to do with mask/unmask ?
>
> The problematc interrupt in identifed as "ioapic2 pin 2" by the NetBSD kernel,
> so it's not MSI/MSI-X (not sure it matters though).
> Maybe something related to mask/unmask ?
What device do you have on that pin? Is it the only device not working
properly? I get from that that MSI/MSI-X is now working fine.
You can get some interrupt info from the 'i' and the 'z' debug keys,
albeit that won't reflect the state of the emulated IO-APIC used by
dom0, which is likely what we care about. There's also the 'M' debug
key, but that's only useful for MSI/MSI-X.
I can try to prepare a patch to dump some info from the emulated
IO-APIC, but I'm afraid I won't get to it until Monday.
Roger.
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