linux-kernel - Re: [PATCH v3 00/16] virtio-pci: towards virtio 1.0 guest support

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Message-ID: <1421665620.3610.13.camel@nilsson.home.kraxel.org>
Date:	Mon, 19 Jan 2015 12:07:00 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 00/16] virtio-pci: towards virtio 1.0 guest support

  Hi,

> BTW: is there a tool (or pciutils patch) which can decode the virtio
> capabilities?

Searched for a patch today, and all google found me was this mail asking
for one :-o

So I went ahead and coded one up.  Attached.

While hacking it up I've noticed spec doesn't match reality.  The
"Virtio Structure PCI Capabilities" section here ...

http://docs.oasis-open.org/virtio/virtio/v1.0/cs01/virtio-v1.0-cs01.html#x1-690004

... doesn't match what qemu is doing.  Huh?


Also note:

[root@...ora ~]# ~kraxel/projects/pciutils/lspci -vvsa
00:0a.0 Communication controller: Red Hat, Inc Virtio console
[ ... ]
	Capabilities: [64] VirtIO: Notify
		BAR=2 offset=00003000 size=00400000
		multiplier=00010000
[ ... ]

Why multiplier is 64k instead of 4k?  Just a tyops?


cheers,
  Gerd


View attachment "0001-add-virtio-vendor-caps.patch" of type "text/x-patch" (3355 bytes)