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From: "Derrick, Jonathan" <jonathan.derrick@intel.com>
To: "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>
Cc: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"Patel, Nirmal" <nirmal.patel@intel.com>,
	"helgaas@kernel.org" <helgaas@kernel.org>,
	"Kalakota, Sushma" <sushma.kalakota@intel.com>
Subject: Re: [PATCH 0/5] Legacy direct-assign mode
Date: Mon, 22 Mar 2021 15:25:34 +0000	[thread overview]
Message-ID: <36c52c3cefe532b1cfaeccd122ef5520cd5fa2cd.camel@intel.com> (raw)
In-Reply-To: <20210322122837.GC11469@e121166-lin.cambridge.arm.com>

On Mon, 2021-03-22 at 12:28 +0000, Lorenzo Pieralisi wrote:
> On Fri, Nov 20, 2020 at 03:51:39PM -0700, Jon Derrick wrote:
> > This set adds a legacy direct-assign mode. Newer enterprise hardware has
> > physical addressing hints to assist device passthrough to guests that needs to
> > correctly program bridge windows with physical addresses. Some customers are
> > using a legacy method that relies on the VMD subdevice domain's root port
> > windows to be written with the physical addresses. This method also allows
> > other hypervisors besides QEMU/KVM to perform guest passthrough.
> > 
> > This patchset adds a host and guest mode to write the physical address
> > information to the root port registers in the host and read them in the guest,
> > and restore them in both cases on module unload.
> > 
> > This patchset also folds in the VMD subdevice domain secondary bus reset
> > patchset [1] to clear the domain prior to guest passthrough.
> > 
> > [1] https://patchwork.kernel.org/project/linux-pci/cover/20200928010557.5324-1-jonathan.derrick@intel.com/
> > 
> > Jon Derrick (5):
> >   PCI: vmd: Reset the VMD subdevice domain on probe
> >   PCI: Add a reset quirk for VMD
> >   PCI: vmd: Add offset translation helper
> >   PCI: vmd: Pass features to vmd_get_phys_offsets()
> >   PCI: vmd: Add legacy guest passthrough mode
> > 
> >  drivers/pci/controller/vmd.c | 200 ++++++++++++++++++++++++++++++++++++++-----
> >  drivers/pci/quirks.c         |  48 +++++++++++
> >  2 files changed, 227 insertions(+), 21 deletions(-)
> 
> Hi Jon,
> 
> it is unclear to me where we are with this series, please let me know.
> 
> Thanks,
> Lorenzo

Hi Lorenzo,

We can drop this series for now. We may revive it in the future with
modifications to the reset sequence.

Best,
Jon

  reply	other threads:[~2021-03-22 15:26 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20 22:51 Jon Derrick
2020-11-20 22:51 ` [PATCH 1/5] PCI: vmd: Reset the VMD subdevice domain on probe Jon Derrick
2020-11-20 22:51 ` [PATCH 2/5] PCI: Add a reset quirk for VMD Jon Derrick
2020-11-24 21:40   ` Bjorn Helgaas
2020-11-25 17:22     ` Derrick, Jonathan
2020-11-25 17:34       ` Alex Williamson
2020-11-20 22:51 ` [PATCH 3/5] PCI: vmd: Add offset translation helper Jon Derrick
2020-11-20 22:51 ` [PATCH 4/5] PCI: vmd: Pass features to vmd_get_phys_offsets() Jon Derrick
2020-11-20 22:51 ` [PATCH 5/5] PCI: vmd: Add legacy guest passthrough mode Jon Derrick
2021-03-22 12:28 ` [PATCH 0/5] Legacy direct-assign mode Lorenzo Pieralisi
2021-03-22 15:25   ` Derrick, Jonathan [this message]
2021-03-22 19:48   ` Christoph Hellwig
2021-03-22 22:55     ` Derrick, Jonathan

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