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Re: [PATCH v3] tools/libxl: don't allow IOMMU usage with PoD
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Date: Thu, 24 Feb 2022 15:01:31 +0000
- Authentication-results: esa2.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none
- Cc: Wei Liu <wl@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 24 Feb 2022 15:02:04 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Feb 18, 2022 at 09:06:35AM +0100, Jan Beulich wrote:
> On 17.02.2022 15:09, Roger Pau Monne wrote:
> > Prevent libxl from creating guests that attempts to use PoD together
> > with an IOMMU, even if no devices are actually assigned.
> >
> > While the hypervisor could support using PoD together with an IOMMU as
> > long as no devices are assigned, such usage seems doubtful. There's no
> > guarantee the guest has PoD no longer be active, and thus a later
> > assignment of a PCI device to such domain could fail.
> >
> > Preventing the usage of PoD together with an IOMMU at guest creation
> > avoids having to add checks for active PoD entries in the device
> > assignment paths.
> >
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> > Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>
> I'm inclined to queue this for the stable trees. Thoughts?
Yes, I think that sound good.
Thanks,
--
Anthony PERARD
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