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

[Chuck Zmudzinski <frchuckz%gmail.com@localhost>]

On 5/23/2025 4:15 PM, Manuel Bouyer wrote:
> 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 ?

I can check later this evening but I have an appointment now.

> 
>> 
>> 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 ?

More or less - I know Xen 4.18.4 worked, now Fedora is at Xen 4.19.

>