Re: xen on i7-12700

[Brad Spencer <brad%anduin.eldar.org@localhost>]

Greg Troxel <gdt%lexort.com@localhost> writes:

[snip]

> and then it goes into a backtrace.  the call stack
>
>   intel_iommu_enable_eim+0/0xe0
>   iommu_enable_x2apic
>   x2apic_bsp_setup
>   __start_xen
>   __high_start
>

[snip]

In the context of IOMMU, there may be bugs lurking... and you might want
to see if you can disable it and get further.  There may be work arounds
that can be enabled too.

https://wiki.xenproject.org/wiki/Xen_PCI_Passthrough - speaks a lot
amount using the IOMMU features for PCI passthrough and talks about bugs
in BIOS and etc and mentiones that there are crashes that Xen tries to
avoid.  Page may be a bit old..

https://wiki.xenproject.org/wiki/VTd_HowTo - this may be an older page,
but it speaks about how to disable IOMMU.  You may want to try and see
if that is possible in 4.18.  Looks like you could do iommu=off at one
point.



It would be a bit of a lose to not use IOMMU, but guests should work
without it.  I don't think that it is required for PVH guests to work.






-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org