Re: [Xen-users] PVH dom0 creation fails - the system freezes

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Jul 23, 2018 at 02:16:59PM +0200, Juergen Gross wrote:
> On 23/07/18 09:52, Bercaru, Gabriel wrote:
> > Hello,
> > 
> > 
> > For the last few days, I have been trying to get a PVH dom0 running,
> > however I encountered the following problem: the system seems to
> > freeze after the hypervisor boots, the screen goes black. I have tried to
> > debug it via a serial console (using Minicom) and managed to get some
> > more Xen output, after the screen turns black.
> >  
> > I mention that I have tried to boot the PVH dom0 using different kernel
> > images (from 4.9.0 to 4.18-rc3), different Xen  versions (4.10, 4.11, 4.12).
> > 
> > Below I attached my system / hypervisor configuration, as well as the
> > output captured through the serial console, corresponding to the latest
> > versions for Xen and the Linux Kernel (Xen staging and Kernel from the
> > xen/tip tree).
> > 
> > 
> > OS + Distro: Linux / Debian 9 Stretch
> > Kernel Version: 4.17-rc5, tagged with for-linus-4.18-rc5-tag from the
> > xen/tip tree.
> > Xen Version: 4.12, commit id e3f667bc5f51d0aa44357a64ca134cd952679c81
> > of the Xen tree.
> > Host system: attached cpuinfo.log
> > Serial console output: attached boot.log
> > My grub configuration file, containing the Xen command line arguments: 
> > attached
> > grub.log
> > 
> > I can provide additional info as requested.
> > Any ideas why this happens? Do you have any recommendations for additional
> > debugging?
> 
> Add "earlyprintk=xen" to the dom0 kernel parameters.
> 
> Any reason why you are trying to use an iommu? I'd start with the simple
> case without iommu.

The IOMMU is a hard requirement for PVH Dom0.

Roger.

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