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

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Message-ID: <Z6N3qQfNo8UXvLjM@macbook.local>
Date: Wed, 5 Feb 2025 15:37:29 +0100
From: Roger Pau Monné <roger.pau@...rix.com>
To: Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	Nirmal Patel <nirmal.patel@...ux.intel.com>,
	Jonathan Derrick <jonathan.derrick@...ux.dev>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2 0/3] xen: fix usage of devices behind a VMD bridge

Ping? This has been pending for 3 weeks without replies.

Thanks, Roger.

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(-)
> 
> -- 
> 2.46.0
>