提交 26b9b5fe 编写于 作者: P Paolo Bonzini 提交者: Anthony Liguori

virtio: fix vhost handling

Commit b1f416aa breaks vhost_net
because it always registers the virtio_pci_host_notifier_read() handler
function on the ioeventfd, even when vhost_net.ko is using the ioeventfd.
The result is both QEMU and vhost_net.ko polling on the same eventfd
and the virtio_net.ko guest driver seeing inconsistent results:

  # ifconfig eth0 192.168.0.1 netmask 255.255.255.0
  virtio_net virtio0: output:id 0 is not a head!

To fix this, proceed the same as we do for irqfd: add a parameter to
virtio_queue_set_host_notifier_fd_handler and in that case only set
the notifier, not the handler.

Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Tested-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
上级 22d48de6
...@@ -160,7 +160,7 @@ static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f) ...@@ -160,7 +160,7 @@ static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
} }
static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy, static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
int n, bool assign) int n, bool assign, bool set_handler)
{ {
VirtQueue *vq = virtio_get_queue(proxy->vdev, n); VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
EventNotifier *notifier = virtio_queue_get_host_notifier(vq); EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
...@@ -173,13 +173,13 @@ static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy, ...@@ -173,13 +173,13 @@ static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
__func__, r); __func__, r);
return r; return r;
} }
virtio_queue_set_host_notifier_fd_handler(vq, true); virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2, memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
true, n, notifier); true, n, notifier);
} else { } else {
memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2, memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
true, n, notifier); true, n, notifier);
virtio_queue_set_host_notifier_fd_handler(vq, false); virtio_queue_set_host_notifier_fd_handler(vq, false, false);
event_notifier_cleanup(notifier); event_notifier_cleanup(notifier);
} }
return r; return r;
...@@ -200,7 +200,7 @@ static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) ...@@ -200,7 +200,7 @@ static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
continue; continue;
} }
r = virtio_pci_set_host_notifier_internal(proxy, n, true); r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
if (r < 0) { if (r < 0) {
goto assign_error; goto assign_error;
} }
...@@ -214,7 +214,7 @@ assign_error: ...@@ -214,7 +214,7 @@ assign_error:
continue; continue;
} }
r = virtio_pci_set_host_notifier_internal(proxy, n, false); r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
assert(r >= 0); assert(r >= 0);
} }
proxy->ioeventfd_started = false; proxy->ioeventfd_started = false;
...@@ -235,7 +235,7 @@ static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) ...@@ -235,7 +235,7 @@ static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
continue; continue;
} }
r = virtio_pci_set_host_notifier_internal(proxy, n, false); r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
assert(r >= 0); assert(r >= 0);
} }
proxy->ioeventfd_started = false; proxy->ioeventfd_started = false;
...@@ -683,7 +683,7 @@ static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign) ...@@ -683,7 +683,7 @@ static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
* currently only stops on status change away from ok, * currently only stops on status change away from ok,
* reset, vmstop and such. If we do add code to start here, * reset, vmstop and such. If we do add code to start here,
* need to check vmstate, device state etc. */ * need to check vmstate, device state etc. */
return virtio_pci_set_host_notifier_internal(proxy, n, assign); return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
} }
static void virtio_pci_vmstate_change(void *opaque, bool running) static void virtio_pci_vmstate_change(void *opaque, bool running)
......
...@@ -1021,13 +1021,16 @@ static void virtio_queue_host_notifier_read(EventNotifier *n) ...@@ -1021,13 +1021,16 @@ static void virtio_queue_host_notifier_read(EventNotifier *n)
} }
} }
void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign) void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
bool set_handler)
{ {
if (assign) { if (assign && set_handler) {
event_notifier_set_handler(&vq->host_notifier, event_notifier_set_handler(&vq->host_notifier,
virtio_queue_host_notifier_read); virtio_queue_host_notifier_read);
} else { } else {
event_notifier_set_handler(&vq->host_notifier, NULL); event_notifier_set_handler(&vq->host_notifier, NULL);
}
if (!assign) {
/* Test and clear notifier before after disabling event, /* Test and clear notifier before after disabling event,
* in case poll callback didn't have time to run. */ * in case poll callback didn't have time to run. */
virtio_queue_host_notifier_read(&vq->host_notifier); virtio_queue_host_notifier_read(&vq->host_notifier);
......
...@@ -233,7 +233,8 @@ EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); ...@@ -233,7 +233,8 @@ EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
bool with_irqfd); bool with_irqfd);
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign); void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
bool set_handler);
void virtio_queue_notify_vq(VirtQueue *vq); void virtio_queue_notify_vq(VirtQueue *vq);
void virtio_irq(VirtQueue *vq); void virtio_irq(VirtQueue *vq);
#endif #endif
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册