linux-kernel - Re: [RFC PATCH 0/7] vfio/pci: SR-IOV support

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Message-ID: <20200205070109.GA18027@infradead.org>
Date:   Tue, 4 Feb 2020 23:01:09 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     kvm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, dev@...k.org, mtosatti@...hat.com,
        thomas@...jalon.net, bluca@...ian.org, jerinjacobk@...il.com,
        bruce.richardson@...el.com, cohuck@...hat.com
Subject: Re: [RFC PATCH 0/7] vfio/pci: SR-IOV support

On Tue, Feb 04, 2020 at 04:05:34PM -0700, Alex Williamson wrote:
> We address this in a few ways in this series.  First, we can use a bus
> notifier and the driver_override facility to make sure VFs are bound
> to the vfio-pci driver by default.  This should eliminate the chance
> that a VF is accidentally bound and used by host drivers.  We don't
> however remove the ability for a host admin to change this override.

That is just such a bad idea.  Using VFs in the host is a perfectly
valid use case that you are breaking.