Re: [PATCH v2 0/3] xen: fix usage of devices behind a VMD bridge

[Jürgen Groß <jgross@xxxxxxxx>]

On 14.02.25 18:17, Bjorn Helgaas wrote:
> [+to Juergen, Nirmal, +cc Jonathan]
>
> On Tue, Jan 14, 2025 at 11:33:10AM +0100, Roger Pau Monne wrote:
> > Hello,
> >
> > The following series should fix the usage of devices behind a VMD bridge
> > when running Linux as a Xen PV hardware domain (dom0).  I've only been
> > able to test PV. I think PVH should also work but I don't have hardware
> > capable of testing it right now.
> >
> > I don't expect the first two patches to be problematic, the last patch
> > is likely to be more controversial.  I've tested it internally and
> > didn't see any issues, but my testing of PV mode is mostly limited to
> > dom0.
> >
> > Thanks, Roger.
> >
> > Roger Pau Monne (3):
> >    xen/pci: do not register devices with segments >= 0x10000
> >    vmd: disable MSI remapping bypass under Xen
> >    pci/msi: remove pci_msi_ignore_mask
> >
> >   arch/x86/pci/xen.c           |  8 ++------
> >   drivers/pci/controller/vmd.c | 19 ++++++++++++++++++
> >   drivers/pci/msi/msi.c        | 37 ++++++++++++++++++++----------------
> >   drivers/xen/pci.c            | 19 ++++++++++++++++++
> >   include/linux/msi.h          |  3 ++-
> >   kernel/irq/msi.c             |  2 +-
> >   6 files changed, 64 insertions(+), 24 deletions(-)
> We got an ack from Thomas, so I'm fine with this from a PCI
> perspective.  How should it be merged?  Via Xen or PCI?  I'm happy to
> merge via PCI, but would also want acks from Juergen for the Xen
> piece and Nirmal for the VMD piece.
I'm fine with this to go in via the PCI tree.

For the Xen related parts:

Acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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