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[Qemu-devel] [PULL v2 13/16] vhost_net: start/stop guest notifiers prope
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v2 13/16] vhost_net: start/stop guest notifiers properly |
Date: |
Wed, 3 Sep 2014 16:45:35 +0300 |
From: Jason Wang <address@hidden>
commit a9f98bb5ebe6fb1869321dcc58e72041ae626ad8 "vhost: multiqueue
support" changed the order of stopping the device. Previously
vhost_dev_stop would disable backend and only afterwards, unset guest
notifiers. We now unset guest notifiers while vhost is still
active. This can lose interrupts causing guest networking to fail. In
particular, this has been observed during migration.
To fix this, several other changes are needed:
- remove the hdev->started assertion in vhost.c since we may want to
start the guest notifiers before vhost starts and stop the guest
notifiers after vhost is stopped.
- introduce the vhost_net_set_vq_index() and call it before setting
guest notifiers. This is to guarantee vhost_net has the correct
virtqueue index when setting guest notifiers.
MST: fix up error handling.
Cc: address@hidden
Cc: Jason Wang <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Tested-by: Andrey Korolyov <address@hidden>
Reported-by: "Zhangjie (HZ)" <address@hidden>
Tested-by: William Dauchy <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
---
hw/net/vhost_net.c | 41 +++++++++++++++++++++++++++--------------
hw/virtio/vhost.c | 2 --
2 files changed, 27 insertions(+), 16 deletions(-)
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 9bbf2ee..3819044 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -188,16 +188,19 @@ bool vhost_net_query(VHostNetState *net, VirtIODevice
*dev)
return vhost_dev_query(&net->dev, dev);
}
+static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
+{
+ net->dev.vq_index = vq_index;
+}
+
static int vhost_net_start_one(struct vhost_net *net,
- VirtIODevice *dev,
- int vq_index)
+ VirtIODevice *dev)
{
struct vhost_vring_file file = { };
int r;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
- net->dev.vq_index = vq_index;
r = vhost_dev_enable_notifiers(&net->dev, dev);
if (r < 0) {
@@ -286,7 +289,7 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
- int r, i = 0;
+ int r, e, i;
if (!vhost_net_device_endian_ok(dev)) {
error_report("vhost-net does not support cross-endian");
@@ -301,11 +304,7 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
}
for (i = 0; i < total_queues; i++) {
- r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev, i * 2);
-
- if (r < 0) {
- goto err;
- }
+ vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
}
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
@@ -314,12 +313,26 @@ int vhost_net_start(VirtIODevice *dev, NetClientState
*ncs,
goto err;
}
+ for (i = 0; i < total_queues; i++) {
+ r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
+
+ if (r < 0) {
+ goto err_start;
+ }
+ }
+
return 0;
-err:
+err_start:
while (--i >= 0) {
vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
}
+ e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
+ if (e < 0) {
+ fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
+ fflush(stderr);
+ }
+err:
return r;
}
@@ -331,16 +344,16 @@ void vhost_net_stop(VirtIODevice *dev, NetClientState
*ncs,
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int i, r;
+ for (i = 0; i < total_queues; i++) {
+ vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
+ }
+
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
if (r < 0) {
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
fflush(stderr);
}
assert(r >= 0);
-
- for (i = 0; i < total_queues; i++) {
- vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
- }
}
void vhost_net_cleanup(struct vhost_net *net)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index e55fe1c..5d7c40a 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -976,7 +976,6 @@ void vhost_dev_disable_notifiers(struct vhost_dev *hdev,
VirtIODevice *vdev)
bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n)
{
struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
- assert(hdev->started);
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
return event_notifier_test_and_clear(&vq->masked_notifier);
}
@@ -988,7 +987,6 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev,
VirtIODevice *vdev, int n,
struct VirtQueue *vvq = virtio_get_queue(vdev, n);
int r, index = n - hdev->vq_index;
- assert(hdev->started);
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
struct vhost_vring_file file = {
--
MST
- [Qemu-devel] [PULL v2 07/16] intel-iommu: add context-cache to cache context-entry, (continued)
- [Qemu-devel] [PULL v2 07/16] intel-iommu: add context-cache to cache context-entry, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 05/16] intel-iommu: fix coding style issues around in q35.c and machine.c, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 09/16] vhost_net: cleanup start/stop condition, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 08/16] intel-iommu: add IOTLB using hash table, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 12/16] pci: avoid losing config updates to MSI/MSIX cap regs, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 10/16] ioh3420: remove unused ioh3420_init() declaration, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 14/16] vhost_net: init acked_features to backend_features, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 15/16] vhost-scsi: init backend features earlier, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 16/16] acpi-build: Set FORCE_APIC_CLUSTER_MODEL bit for FADT flags, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 11/16] virtio-net: don't run bh on vm stopped, Michael S. Tsirkin, 2014/09/03
- [Qemu-devel] [PULL v2 13/16] vhost_net: start/stop guest notifiers properly,
Michael S. Tsirkin <=