Re: Xen 4.18.4_20241221nb0 panic (Was: Re: EFI and Xen)

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

On Fri, May 23, 2025 at 04:13:01PM -0400, Chuck Zmudzinski wrote:
> [...]
> I needed to acquire a PCI serial card to get some useful messages because the motherboard does not have a built-in serial port.
> 
> It appears Xen 4.18.4_20241221nb0 from pkgsrc crashes on my box before the NetBSD dom0 starts:
> 
> -------- snip ------
> (XEN) Xen call trace:
> (XEN)    [<ffff82d040261a00>] R intel_iommu_enable_eim+0/0xe0
> (XEN)    [<ffff82d040268ac4>] S iommu_enable_x2apic+0x24/0x70
> (XEN)    [<ffff82d0403f579d>] S x2apic_bsp_setup+0x12d/0x220
> (XEN)    [<ffff82d0403ff0e4>] S __start_xen+0x1af4/0x2620
> (XEN)    [<ffff82d040204434>] S __high_start+0x94/0xa0
> (XEN) 
> (XEN) 
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) CONTROL-FLOW PROTECTION FAULT: #CP[0003] endbranch
> (XEN) ****************************************
> (XEN) 
> (XEN) Reboot in five seconds...
> (XEN) Resetting with ACPI MEMORY or I/O RESET_REG.
> -------- end messages ------

Do you have a way to disable x2apic in the BIOS ?

> 
> Please note only the pkgsrc version of Xen crashes. I can boot Xen with no problems using Xen packaged by Fedora, AlmaLinux, etc. on this box.

Is it the same Xen version ?

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