Re: [Bug 55421] igb VF can't work in KVM guest

Alex Williamson
2013-03-21T21:32:00Z

Mitch,

Bugzilla wouldn't let me add you to the CC, so FYI...
Thanks,

Alex

On Thu, 2013-03-21 at 21:29 +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=55421
>
>
> Alex Williamson <alex.williamson@redhat.com> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |alex.williamson@redhat.com,
> | |jeffrey.t.kirsher@intel.com
>
>
>
>
> --- Comment #4 from Alex Williamson <alex.williamson@redhat.com> 2013-03-21 21:29:09 ---
> Further bisected to:
>
> commit 5ac6f91d39e0884813dc010e14552143cd1d0d8b
> Author: Mitch A Williams <mitch.a.williams@intel.com>
> Date: Fri Jan 18 08:57:20 2013 +0000
>
> igb: Don't give VFs random MAC addresses
>
> If the user has not assigned a MAC address to a VM, then don't give it a
> random one. Instead, just give it zeros and let it figure out what to do
> with them.
>
> Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
> CC: Andy Gospodarek <andy@greyhouse.net>
> CC: Stefan Assmann <sassmann@kpanic.de>
> Tested-by: Aaron Brown <aaron.f.brown@intel.com>
> Tested-by: Stefan Assmann <sassmann@redhat.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
>
> So, for whatever reason we no longer assign a random MAC address when using the
> device in a VM (but we do still use one if attached to igbvf in the host). I
> expect we'll eventually see this on all the Intel SR-IOV NICs. The solution is
> to use the ip command to assign the VF a valid MAC address prior to using it
> with KVM. I'll let those who made the change defend it further if they wish.
>