linux-kernel - Re: [PATCH v3 0/3] xen: Fix usage of devices behind a VMD bridge

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Message-ID: <Z8lhR2DSsB8P6L96@macbook.local>
Date: Thu, 6 Mar 2025 09:48:07 +0100
From: Roger Pau Monné <roger.pau@...rix.com>
To: Nirmal Patel <nirmal.patel@...ux.intel.com>,
	Bjorn Helgaas <helgaas@...nel.org>, Juergen Gross <jgross@...e.com>
Cc: linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 0/3] xen: Fix usage of devices behind a VMD bridge

Hello,

I've attempted to ping Nirmal directly on the VMD patch, but got no
reply so far.

First version of this series was posted on 10/01, yet there hasn't
been any feedback from Nirmal.  Would it be possible to merge this
without Nirmal Ack due to timeout?

It's not even a new feature, just a bugfix that allows running with
VMD devices when using Xen.

Thanks, Roger.

On Wed, Feb 19, 2025 at 10:20:54AM +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
>   PCI: vmd: Disable MSI remapping bypass under Xen
>   PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag
> 
>  arch/x86/pci/xen.c           |  8 ++------
>  drivers/pci/controller/vmd.c | 20 +++++++++++++++++++
>  drivers/pci/msi/msi.c        | 37 ++++++++++++++++++++----------------
>  drivers/xen/pci.c            | 32 +++++++++++++++++++++++++++++++
>  include/linux/msi.h          |  3 ++-
>  kernel/irq/msi.c             |  2 +-
>  6 files changed, 78 insertions(+), 24 deletions(-)
> 
> -- 
> 2.46.0
>