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Re: [Xen-users] Fwd: dom0=pvh and 4.18


  • To: Paul Gorman <pagorman@xxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxxx
  • From: Glenn Enright <glenn@xxxxxxxxxxxxxxx>
  • Date: Tue, 14 Aug 2018 11:45:58 +1200
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  • Delivery-date: Mon, 13 Aug 2018 23:46:28 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 13/08/18 14:51, Paul Gorman wrote:
> On Sun, Aug 12, 2018, 8:32 PM Glenn Enright <glenn@xxxxxxxxxxxxxxx> wrote:
> 
>> Hi all,
>>
>> Doing some testing with 4.18 kernel, trying to get dom0=pvh working with
>> xen4.11.
>>
>> Builds are from my own test machine, with a gcc8.0 toolchain for
>> centos6. Test machine is a Supermicro X9 board with Dual E52630v2 cpus.
>>
>> What I'm seeing is that xen boots up fine, but on the transition to the
>> linux kernel, the screen goes blank and the server never pings. I've
>> tried a bunch of different command line options including various
>> console/serial with no change.
>>
>> Does anyone have a magical set of xen boot options that could help get
>> me started or at least show something to point the way?
>>
>> Thanks
>> --Glenn
>>
> 
> Glenn! I had some issues getting Dom0 to boot up as well. My initramfs
> requires a password entry, and such was not allowed by my initial setup. I
> feel your pain.
> 
> Lemme share what got me off the ground, in case it has something you
> haven't tried.
> 
> In the grub.cfg:
> 
> multiboot    /xen.gz dom0_mem=2048M.max:4096M iommu=no-igfx ucode=scan
> 
> module /vm-linuz-4.17.13-gentoo {stuff specific to my setup that I doubt we
> have in common} softlevel=xen console=tty quiet vt.handoff=3
> 
> The "console=tty" was important for me. And vt.handoff=3 for a
> console-booting system. vt.handoff=7 if it boots directly into a DE.
> 
> And now you've got me curious about how to replicate your success. Where is
> the Dom0 config file where I can add "type=pvh"? Was there more involved
> than what you've already mentioned?
> 

FWIW dom0=pvh is a xen command line option. It is new/experimental.

The point is I never to get a pinging dom0. So not succeeding at all.
All that is seen is a blank screen after the hyper-visor hands off to
the kernel. A stripped down example set of grub looks like below. Note
no quiet or rhgb options.

kernel /xen.gz dom0_mem=2048M iommu=required,debug,verbose dom0=pvh
module /vmlinuz-4.18.0-2.el6xen.x86_64 ro root=<sniped> pcie_aspm=off
panic=30
module /initrd-4.18.0-2.el6xen.x86_64.img

So my question, restated, are there any gotchas in getting dom0 booting
specifically in pvh mode?

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