From: Mark McLoughlin <markmc@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 1/1] kvm: qemu: virtio-net: migration fixes
Date: Wed, 07 Jan 2009 10:23:40 +0000 [thread overview]
Message-ID: <1231323820.5050.10.camel@localhost.localdomain> (raw)
In-Reply-To: <1231242498-3191-1-git-send-email-markmc@redhat.com>
Hi Avi,
A new version, with Anthony's suggested savevm version number bump.
Cheers,
Mark.
From: Mark McLoughlin <markmc@redhat.com>
Subject: [PATCH] kvm: qemu: virtio-net: migration fixes
We were failing to save two important pieces of state:
1) Whether the guest will supply us rx buffers using the
new mergeable format; this caused the migrated guest
to crash with "virtio-net header not in first element"
2) Whether the tx/rx buffers we exchange with the tap
code should include a virtio_net_hdr header; this
caused the migrated guest to receive garbage packets
because the tap code was stripping away the header
and virtio_net was interpreting packet data as the
virtio_net header
With these fixes a guest using mergeable rx buffers and
GSO passes a simple "ping while migrating" test.
Bump the savevm version number and refuse to load v1 saves
just to be on the safe side.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
---
qemu/hw/virtio-net.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/qemu/hw/virtio-net.c b/qemu/hw/virtio-net.c
index ef8f591..dfe370a 100644
--- a/qemu/hw/virtio-net.c
+++ b/qemu/hw/virtio-net.c
@@ -360,19 +360,30 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
qemu_put_buffer(f, n->mac, 6);
qemu_put_be32(f, n->tx_timer_active);
+ qemu_put_be32(f, n->mergeable_rx_bufs);
+
+#ifdef TAP_VNET_HDR
+ qemu_put_be32(f, tap_has_vnet_hdr(n->vc->vlan->first_client));
+#endif
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIONet *n = opaque;
- if (version_id != 1)
+ if (version_id != 2)
return -EINVAL;
virtio_load(&n->vdev, f);
qemu_get_buffer(f, n->mac, 6);
n->tx_timer_active = qemu_get_be32(f);
+ n->mergeable_rx_bufs = qemu_get_be32(f);
+
+#ifdef TAP_VNET_HDR
+ if (qemu_get_be32(f))
+ tap_using_vnet_hdr(n->vc->vlan->first_client, 1);
+#endif
if (n->tx_timer_active) {
qemu_mod_timer(n->tx_timer,
@@ -407,7 +418,7 @@ PCIDevice *virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
n->tx_timer_active = 0;
n->mergeable_rx_bufs = 0;
- register_savevm("virtio-net", virtio_net_id++, 1,
+ register_savevm("virtio-net", virtio_net_id++, 2,
virtio_net_save, virtio_net_load, n);
return (PCIDevice *)n;
--
1.6.0.6
next prev parent reply other threads:[~2009-01-07 10:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-06 11:48 [PATCH 1/1] kvm: qemu: virtio-net: migration fixes Mark McLoughlin
2009-01-07 10:23 ` Mark McLoughlin [this message]
2009-01-08 14:11 ` Avi Kivity
2009-01-11 15:50 ` Avi Kivity
2009-01-11 15:51 ` Avi Kivity
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