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Re: PVH Dom0 related UART failure
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 19 May 2023 09:38:47 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, andrew.cooper3@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, marmarek@xxxxxxxxxxxxxxxxxxxxxx, xenia.ragiadakou@xxxxxxx
- Delivery-date: Fri, 19 May 2023 07:39:18 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, May 19, 2023 at 09:22:58AM +0200, Jan Beulich wrote:
> On 18.05.2023 12:34, Roger Pau Monné wrote:
> > On Wed, May 17, 2023 at 05:59:31PM -0700, Stefano Stabellini wrote:
> >> I have run into another PVH Dom0 issue. I am trying to enable a PVH Dom0
> >> test with the brand new gitlab-ci runner offered by Qubes. It is an AMD
> >> Zen3 system and we already have a few successful tests with it, see
> >> automation/gitlab-ci/test.yaml.
> >>
> >> We managed to narrow down the issue to a console problem. We are
> >> currently using console=com1 com1=115200,8n1,pci,msi as Xen command line
> >> options, it works with PV Dom0 and it is using a PCI UART card.
> >>
> >> In the case of Dom0 PVH:
> >> - it works without console=com1
> >> - it works with console=com1 and with the patch appended below
> >> - it doesn't work otherwise and crashes with this error:
> >> https://matrix-client.matrix.org/_matrix/media/r0/download/invisiblethingslab.com/uzcmldIqHptFZuxqsJtviLZK
> >
> > Jan also noticed this, and we have a ticket for it in gitlab:
> >
> > https://gitlab.com/xen-project/xen/-/issues/85
> >
> >> What is the right way to fix it?
> >
> > I think the right fix is to simply avoid hidden devices from being
> > handled by vPCI, in any case such devices won't work propewrly with
> > vPCI because they are in use by Xen, and so any cached information by
> > vPCI is likely to become stable as Xen can modify the device without
> > vPCI noticing.
> >
> > I think the chunk below should help. It's not clear to me however how
> > hidden devices should be handled, is the intention to completely hide
> > such devices from dom0?
>
> No, Dom0 should still be able to see them in a (mostly) r/o fashion.
> Hence my earlier RFC patch making vPCI actually deal with them.
What's the difference between a hidden device and one that's marked RO
then?
Thanks, Roger.
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