[Bug 224003] xen kernel panics

[Roger Pau Monné]

On Thu, Mar 29, 2018 at 11:32:19PM +0000, Chris wrote:
> I'm having similar problems with xen on 11.1, AMD64, June 2017.
> The OS runs fine, but installed xen from package, setup exactly
> as per the handbook and get a kernel panic on two machines,
> complaining about iommu not being enabled.

FreeBSD/Xen Dom0 requires a working IOMMU, that's documented in the
handbook [0] section 21.8.1.

Can you paste the full output that you get when booting under Xen?

> Machines are: a Sun X4170 to start, then  a Proliant DL380 G7
> with E5630 cpu. Both have all the virtualisation options
> enabled in the bios, but there are no options on either machine
>  for iommu.

On Intel hardware the IOMMU is called VT-d. I have no idea if the
hardware that you list has an IOMMU, it depends on both the CPU and
the motherboard.

Without VT-d (an IOMMU) FreeBSD/Xen Dom0 won't work.

Roger.

[0] https://www.freebsd.org/doc/handbook/virtualization-host-xen.html