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Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with
From: |
Dustin Kirkland |
Subject: |
Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network |
Date: |
Thu, 29 Oct 2009 09:34:34 -0500 |
On Thu, 2009-10-29 at 14:25 +0000, Mark McLoughlin wrote:
> On Thu, 2009-10-29 at 09:11 -0500, Anthony Liguori wrote:
> > Mark McLoughlin wrote:
> > >
> > >> tap_set_offload(csum: 1, tso4: 1, tso6: 1, ecn: 1)
> > >> being called and get an mtu of 1500 on virbr0 using his birdge.sh script.
> > >>
> > >> virtio_net_receive2 was trying to transfer a 1534 byte packet (1524
> > >> 'size' + 10 'virtio_net_hdr')
> > >> and the guest only had 1524 bytes of space in its input descriptors.
> > >>
> > >
> > > Okay, that sounds like a bug in Dustin's version of the guest virtio-net
> > > driver - if it is only supplying 1524 byte buffers, it should not be
> > > saying it supports the VIRTIO_NET_F_GUEST_TSO4 feature
> > >
> >
> > See:
> >
> > commit 8eca6b1bc770982595db2f7207c65051572436cb
> > Author: aliguori <address@hidden>
> > Date: Sun Apr 5 17:40:08 2009 +0000
> >
> > Fix oops on 2.6.25 guest (Rusty Russell)
> >
> > I believe this is behind the following:
> > https://bugs.edge.launchpad.net/ubuntu/jaunty/+source/linux/+bug/331128
> >
> > virtio_pci in 2.6.25 didn't do feature negotiation correctly: it
> > acked every
> > bit. Fortunately, we can detect this.
> >
> > Signed-off-by: Rusty Russell <address@hidden>
> > Signed-off-by: Anthony Liguori <address@hidden>
> >
> > It looks like Rusty's fix wasn't enough. If I change virtio-net to only
> > advertise F_MAC, we don't run into this problem.
>
> If it's not acking VBAD_FEATURE, then it doesn't sound like the same
> issue
>
> It's also not acking e.g. MRG_RXBUF, which suggests that it is
> selectively acking features, and choosing to ack TSO4
>
> A quick look through the guest driver code should clear up the
> confusion. Dustion, got a pointer?
Hi Mark,
I'm currently testing Scott's patch above.
In the mean time, Hardy's kernel is in git here:
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy.git;a=summary
Thanks,
:-Dustin
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- [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Dustin Kirkland, 2009/10/28
- [Qemu-devel] Re: qemu-kvm-0.11 regression, crashes on older guests with virtio network, Dustin Kirkland, 2009/10/28
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Scott Tsai, 2009/10/28
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Scott Tsai, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Scott Tsai, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Anthony Liguori, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network,
Dustin Kirkland <=
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Dustin Kirkland, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Anthony Liguori, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Dustin Kirkland, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Dustin Kirkland, 2009/10/29
- Re: [Qemu-devel] qemu-kvm-0.11 regression, crashes on older guests with virtio network, Mark McLoughlin, 2009/10/29
- [Qemu-devel] [PATCH] whitelist host virtio networking features [was Re: qemu-kvm-0.11 regression, crashes on older ...], Dustin Kirkland, 2009/10/29
- [Qemu-devel] Re: [PATCH] whitelist host virtio networking features [was Re: qemu-kvm-0.11 regression, crashes on older ...], Dustin Kirkland, 2009/10/30