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From: Christoph Hellwig <hch@infradead.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jon Derrick <jonathan.derrick@intel.com>,
	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 19:48:11 +0000	[thread overview]
Message-ID: <20210322194811.GA2141770@infradead.org> (raw)
In-Reply-To: <20210322122837.GC11469@e121166-lin.cambridge.arm.com>

On Mon, Mar 22, 2021 at 12:28:37PM +0000, Lorenzo Pieralisi wrote:
> > 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 seems like a bad idea.  What are these other hypervisors?  AFAIK
there are no purely userspace hypervisors, so in other words what you
propose here is only for unsupported external modules.

I don't think we shoud merge something like this.

  parent reply	other threads:[~2021-03-22 19:50 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
2021-03-22 19:48   ` Christoph Hellwig [this message]
2021-03-22 22:55     ` Derrick, Jonathan

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