Re: kern/55667 (regression: XEN3_DOM0 fails to boot on)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, May 26, 2022 at 07:36:01AM +0200, Frank Kardel wrote:
> On 05/25/22 21:05, Manuel Bouyer wrote:
> > The following reply was made to PR kern/55667; it has been noted by GNATS.
> > 
> > From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
> > To: Frank Kardel <kardel%netbsd.org@localhost>
> > Cc: gnats-bugs%netbsd.org@localhost, jdolecek%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
> >          netbsd-bugs%netbsd.org@localhost
> > Subject: Re: kern/55667 (regression: XEN3_DOM0 fails to boot on)
> > Date: Wed, 25 May 2022 21:02:46 +0200
> > 
> >   --hjWYvqh1VhkoqIsN
> >   Content-Type: text/plain; charset=us-ascii
> >   Content-Disposition: inline
> >   On Wed, May 25, 2022 at 07:51:12PM +0200, Frank Kardel wrote:
> >   > See uuencodes files:
> >   thanks, I see nothing obvious here.
> >   Please rebuild the netbsd-XEN3_DOM0 kernel with the attached patch,
> >   and use the attached xen-debug.gz (it has extra printk which I used to debug
> >   the msi/msi-x setup). Hopefully this will tell us why Xen refuses to map
> >   the msi-x, and then the msi interrupts.
> >   --
> >   Manuel Bouyer <bouyer%antioche.eu.org@localhost>
> >        NetBSD: 26 ans d'experience feront toujours la difference
> >   --
> >   --hjWYvqh1VhkoqIsN
> >   Content-Type: text/plain; charset=us-ascii
> >   Content-Disposition: attachment; filename=diff
> Here is the output (I had to wait for backup to complete):

thanks.
So Xen is failing eiter because it has no useable APIC or, more likely,
it doens't find the PCI device. One possible cause is that this machine is
using non-0 PCI segments, but we don't support PCI segments (and always
set it to 0 when talking to Xen). Fixing it requires touching the MI pci
infrastructure, which may not be a good idea so close to netbsd-10.

Anyway the fallback to legacy interrupts should work. I think there's a
problem specific to ixg(4) with legacy interrupts, I've opened kern/56857
about it.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--