net/vhost-vdpa.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
According to VirtIO standard, "The class, command and
command-specific-data are set by the driver,
and the device sets the ack byte.
There is little it can do except issue a diagnostic
if ack is not VIRTIO_NET_OK."
Therefore, QEMU should stop sending the queued SVQ commands and
cancel the device startup if the device's ack is not VIRTIO_NET_OK.
Yet the problem is that, vhost_vdpa_net_load_x() returns 1 based on
`*s->status != VIRTIO_NET_OK` when the device's ack is VIRTIO_NET_ERR.
As a result, net->nc->info->load() also returns 1, this makes
vhost_net_start_one() incorrectly assume the device state is
successfully loaded by vhost_vdpa_net_load() and return 0, instead of
goto `fail` label to cancel the device startup, as vhost_net_start_one()
only cancels the device startup when net->nc->info->load() returns a
negative value.
This patch fixes this problem by returning -EINVAL when the device's
ack is not VIRTIO_NET_OK.
Fixes: f73c0c43ac ("vdpa: extract vhost_vdpa_net_load_mac from vhost_vdpa_net_load")
Fixes: f64c7cda69 ("vdpa: Add vhost_vdpa_net_load_mq")
Fixes: 0b58d3686a ("vdpa: Add vhost_vdpa_net_load_offloads()")
Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
---
v2:
- fix the same bug in vhost_vdpa_net_load_offloads()
v1: https://lore.kernel.org/all/cover.1686746406.git.yin31149@gmail.com/
net/vhost-vdpa.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index e19ab063fa..6f6a5c6df6 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -646,8 +646,9 @@ static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n)
if (unlikely(dev_written < 0)) {
return dev_written;
}
-
- return *s->status != VIRTIO_NET_OK;
+ if (*s->status != VIRTIO_NET_OK) {
+ return -EINVAL;
+ }
}
return 0;
@@ -670,8 +671,11 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
if (unlikely(dev_written < 0)) {
return dev_written;
}
+ if (*s->status != VIRTIO_NET_OK) {
+ return -EINVAL;
+ }
- return *s->status != VIRTIO_NET_OK;
+ return 0;
}
static int vhost_vdpa_net_load_offloads(VhostVDPAState *s,
@@ -708,8 +712,11 @@ static int vhost_vdpa_net_load_offloads(VhostVDPAState *s,
if (unlikely(dev_written < 0)) {
return dev_written;
}
+ if (*s->status != VIRTIO_NET_OK) {
+ return -EINVAL;
+ }
- return *s->status != VIRTIO_NET_OK;
+ return 0;
}
static int vhost_vdpa_net_load(NetClientState *nc)
--
2.25.1
On Tue, Jun 27, 2023 at 10:36 PM Hawkins Jiawei <yin31149@gmail.com> wrote: > > According to VirtIO standard, "The class, command and > command-specific-data are set by the driver, > and the device sets the ack byte. > There is little it can do except issue a diagnostic > if ack is not VIRTIO_NET_OK." > > Therefore, QEMU should stop sending the queued SVQ commands and > cancel the device startup if the device's ack is not VIRTIO_NET_OK. > > Yet the problem is that, vhost_vdpa_net_load_x() returns 1 based on > `*s->status != VIRTIO_NET_OK` when the device's ack is VIRTIO_NET_ERR. > As a result, net->nc->info->load() also returns 1, this makes > vhost_net_start_one() incorrectly assume the device state is > successfully loaded by vhost_vdpa_net_load() and return 0, instead of > goto `fail` label to cancel the device startup, as vhost_net_start_one() > only cancels the device startup when net->nc->info->load() returns a > negative value. > > This patch fixes this problem by returning -EINVAL when the device's > ack is not VIRTIO_NET_OK. > > Fixes: f73c0c43ac ("vdpa: extract vhost_vdpa_net_load_mac from vhost_vdpa_net_load") > Fixes: f64c7cda69 ("vdpa: Add vhost_vdpa_net_load_mq") > Fixes: 0b58d3686a ("vdpa: Add vhost_vdpa_net_load_offloads()") > Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> Acked-by: Jason Wang <jasowang@redhat.com> Thanks > --- > v2: > - fix the same bug in vhost_vdpa_net_load_offloads() > > v1: https://lore.kernel.org/all/cover.1686746406.git.yin31149@gmail.com/ > > net/vhost-vdpa.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > > diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c > index e19ab063fa..6f6a5c6df6 100644 > --- a/net/vhost-vdpa.c > +++ b/net/vhost-vdpa.c > @@ -646,8 +646,9 @@ static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) > if (unlikely(dev_written < 0)) { > return dev_written; > } > - > - return *s->status != VIRTIO_NET_OK; > + if (*s->status != VIRTIO_NET_OK) { > + return -EINVAL; > + } > } > > return 0; > @@ -670,8 +671,11 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s, > if (unlikely(dev_written < 0)) { > return dev_written; > } > + if (*s->status != VIRTIO_NET_OK) { > + return -EINVAL; > + } > > - return *s->status != VIRTIO_NET_OK; > + return 0; > } > > static int vhost_vdpa_net_load_offloads(VhostVDPAState *s, > @@ -708,8 +712,11 @@ static int vhost_vdpa_net_load_offloads(VhostVDPAState *s, > if (unlikely(dev_written < 0)) { > return dev_written; > } > + if (*s->status != VIRTIO_NET_OK) { > + return -EINVAL; > + } > > - return *s->status != VIRTIO_NET_OK; > + return 0; > } > > static int vhost_vdpa_net_load(NetClientState *nc) > -- > 2.25.1 >
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