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From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Jon Derrick <jonathan.derrick@intel.com>
Cc: linux-pci@vger.kernel.org, Bjorn Helgaas <helgaas@kernel.org>,
	Nirmal Patel <nirmal.patel@intel.com>,
	Sushma Kalakota <sushmax.kalakota@intel.com>
Subject: Re: [PATCH 0/5] Legacy direct-assign mode
Date: Mon, 22 Mar 2021 12:28:37 +0000	[thread overview]
Message-ID: <20210322122837.GC11469@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <20201120225144.15138-1-jonathan.derrick@intel.com>

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

  parent reply	other threads:[~2021-03-22 12:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20 22:51 [PATCH 0/5] Legacy direct-assign mode 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 ` Lorenzo Pieralisi [this message]
2021-03-22 15:25   ` [PATCH 0/5] Legacy direct-assign mode Derrick, Jonathan
2021-03-22 19:48   ` Christoph Hellwig
2021-03-22 22:55     ` Derrick, Jonathan

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