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From: "Rustad, Mark D" <>
To: Alexander Duyck <>
Cc: ""
	Netdev <>,
	LKML <>,
	"" <>,
	"Daly, Dan" <>,
	Alex Williamson <>,
	"" <>,
	"Michael S. Tsirkin" <>
Subject: Re: [RFC PATCH V4] pci: virtio_pci: Add SR-IOV support for virtio_pci devices
Date: Mon, 26 Feb 2018 17:48:15 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


> On Feb 26, 2018, at 7:26 AM, Alexander Duyck <> wrote:
> Mark,
> In the future please don't put my "Reviewed-by" on a patch that I
> haven't reviewed. I believe I reviewed one of the earlier patches, but
> I hadn't reviewed this version.

I'm very sorry. I completely spaced doing something about that. I think yours was the first Reviewed-by I ever had in this way. In the future I will remove such things from my changelog right after sending. Thanks for alerting me to what I had failed to do.

> Also, after thinking about it over the weekend we may want to look at
> just coming up with a truly "generic" solution that is applied to
> SR-IOV capable devices that don't have a SR-IOV capable driver loaded
> on them. That would allow us to handle the uio, vfio, pci-stub, and
> virtio cases all in one fell swoop. I think us going though and
> modifying one patch at a time to do this kind of thing isn't going to
> scale.

The notion of that kind of troubles me - at least pci-stub does. Having worked on ixgbe a bit, I have to wonder what kind of havoc would ensue if an ixgbe device were assigned to a guest, and an attempt was made to allocate VFs by the pci-stub. The guest could be running any version of the ixgbe driver, possibly even an old one that didn't support SR-IOV. Even if it did support SR-IOV, I don't know how it would respond to mailbox messages when it doesn't think it has VFs.

> I'll try to do some digging and find the VFIO approach we had been
> working on. I think with a couple tweaks we can probably make that
> truly generic and ready for submission.

I'd like to know more about you are thinking about.

Mark Rustad, Networking Division, Intel Corporation

  reply	other threads:[~2018-02-26 17:50 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-26  4:48 [RFC PATCH V4] pci: virtio_pci: Add SR-IOV support for virtio_pci devices Mark Rustad
2018-02-26 15:26 ` Alexander Duyck
2018-02-26 17:48   ` Rustad, Mark D [this message]
2018-02-26 18:05     ` Alexander Duyck
2018-02-26 22:38       ` Michael S. Tsirkin
2018-02-26 22:44         ` Alexander Duyck
2018-02-26 22:32   ` Michael S. Tsirkin
2018-02-26 22:38     ` Alexander Duyck
2018-02-26 22:39       ` Michael S. Tsirkin

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