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From: "Derrick, Jonathan" <jonathan.derrick@intel.com>
To: "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
	"hch@infradead.org" <hch@infradead.org>
Cc: "Kalakota, SushmaX" <sushmax.kalakota@intel.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"Patel, Nirmal" <nirmal.patel@intel.com>,
	"helgaas@kernel.org" <helgaas@kernel.org>
Subject: Re: [PATCH 0/5] Legacy direct-assign mode
Date: Mon, 22 Mar 2021 22:55:46 +0000	[thread overview]
Message-ID: <804d2bff5bbe8e80004cbcbeaed3245b1acedf28.camel@intel.com> (raw)
In-Reply-To: <20210322194811.GA2141770@infradead.org>

On Mon, 2021-03-22 at 19:48 +0000, Christoph Hellwig wrote:
> 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.
Any of the type 1 hypervisors here:
https://en.wikipedia.org/wiki/Hypervisor

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

      reply	other threads:[~2021-03-22 22:56 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
2021-03-22 22:55     ` Derrick, Jonathan [this message]

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