linux-kernel - Re: [PATCH] vfio: Add an ioctl to reset the device

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Message-ID: <1303251751.3110.129.camel@x201>
Date:	Tue, 19 Apr 2011 16:22:31 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Chris Wright <chrisw@...hat.com>
Cc:	pugs@...e.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, qemu-devel@...gnu.org,
	aafabbri@...co.com, dwang2@...co.com, benve@...co.com
Subject: Re: [PATCH] vfio: Add an ioctl to reset the device

On Tue, 2011-04-19 at 15:07 -0700, Chris Wright wrote:
> * Alex Williamson (alex.williamson@...hat.com) wrote:
> > When using VFIO to assign a device to a guest, we want to make sure
> > the device is quiesced on VM reset to stop all DMA within the guest
> > mapped memory.  Add an ioctl which just calls pci_reset_function()
> > and returns whether it succeeds.
> 
> Shouldn't there be a reset when binding/unbinding vfio to/from a pci
> device?

There's already one when the /dev/vfioX file is opened, we should add
another on release, and probably add the same PCI save state store/load
that I'm proposing for KVM across those.  Thanks,

Alex

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