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Re: port-xen/50446: dom0 kernel panics at boot attaching agp

The following reply was made to PR port-xen/50446; it has been noted by GNATS.

From: Manuel Bouyer <>
Subject: Re: port-xen/50446: dom0 kernel panics at boot attaching agp
Date: Thu, 19 Nov 2015 09:31:10 +0100

 On Thu, Nov 19, 2015 at 06:15:01AM +0000, Andreas Gustafsson wrote:
 > System: NetBSD
 > Architecture: x86_64
 > Machine: amd64
 > >Description:
 > I'm trying to test NetBSD 7.0/Xen on a PC with a ASUS P5B-V
 > motherboard.  Since this machine is affected by PR 50060,
 > I have applied the fix for that bug to the 7.0 sources:
 >    cvs rdiff -u -r1.118 -r1.119 src/sys/dev/pci/agp_i810.c
 > With that patch, the machine sucessfully boots a non-Xen kernel.
 > However, attempting to boot a dom0 kernel under Xen 4.2.5 results
 > in a panic:
 >    pchb0 at pci0 dev 0 function 0: vendor 0x8086 product 0x29a0 (rev. 0x02)
 >    agp0 at pchb0: i965-family chipset
 >    xpq_flush_queue: 1 entries (0 successful) on cpu0 (0)
 >    cpu0 (0):
 >      0x000000009d5a2c78: 0x8000000000100017
 >     kpm_pdir[0]: 0xab009027
 >    panic: HYPERVISOR_mmu_update failed, ret: -16
 debug messages from the hypervisor would be usefull at this point.
 Unfortunably, I don't know a way to get theses without serial console.
 Manuel Bouyer <>
      NetBSD: 26 ans d'experience feront toujours la difference

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