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

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

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