From: Stefan Hajnoczi stefa...@linux.vnet.ibm.com
This patch starts and stops vhost as the virtio device transitions
through its status phases. Vhost can only be started once the guest
reports its driver has successfully initialized, which means the
virtqueues have been set up by the guest.
(v2: Squash virtio-scsi: use the vhost-scsi host device from stefan)
Signed-off-by: Stefan Hajnoczi stefa...@linux.vnet.ibm.com
Signed-off-by: Zhi Yong Wu wu...@linux.vnet.ibm.com
Cc: Michael S. Tsirkin m...@redhat.com
Cc: Paolo Bonzini pbonz...@redhat.com
Signed-off-by: Nicholas Bellinger n...@linux-iscsi.org
---
hw/virtio-pci.c |2 ++
hw/virtio-scsi.c | 41 -
2 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 0f0f766..64f2f0d 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -1060,6 +1060,8 @@ static int virtio_scsi_exit_pci(PCIDevice *pci_dev)
}
static Property virtio_scsi_properties[] = {
+DEFINE_PROP_VHOST_SCSI(vhost-scsi, VirtIOPCIProxy,
+scsi.vhost_scsi),
DEFINE_PROP_UINT32(vectors, VirtIOPCIProxy, nvectors, 2),
DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index dea3269..b0adfde 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -15,6 +15,7 @@
#include qemu-common.h
#include qemu-error.h
+#include vhost-scsi.h
#include virtio-scsi.h
#include hw/scsi.h
#include hw/scsi-defs.h
@@ -601,6 +602,38 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = {
.load_request = virtio_scsi_load_request,
};
+static bool virtio_scsi_started(VirtIOSCSI *s, uint8_t val)
+{
+return (val VIRTIO_CONFIG_S_DRIVER_OK) s-vdev.vm_running;
+}
+
+static void virtio_scsi_set_status(VirtIODevice *vdev, uint8_t val)
+{
+VirtIOSCSI *s = to_virtio_scsi(vdev);
+bool start = virtio_scsi_started(s, val);
+
+if (s-vhost_started == start) {
+return;
+}
+
+if (start) {
+int ret;
+
+ret = vhost_scsi_start(s-vhost_scsi, vdev);
+if (ret 0) {
+error_report(virtio-scsi: unable to start vhost: %s\n,
+ strerror(-ret));
+
+/* There is no userspace virtio-scsi fallback so exit */
+exit(1);
+}
+} else {
+vhost_scsi_stop(s-vhost_scsi, vdev);
+}
+
+s-vhost_started = start;
+}
+
VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
{
VirtIOSCSI *s;
@@ -622,6 +655,9 @@ VirtIODevice *virtio_scsi_init(DeviceState *dev,
VirtIOSCSIConf *proxyconf)
s-vdev.set_config = virtio_scsi_set_config;
s-vdev.get_features = virtio_scsi_get_features;
s-vdev.reset = virtio_scsi_reset;
+if (s-vhost_scsi) {
+s-vdev.set_status = virtio_scsi_set_status;
+}
s-ctrl_vq = virtio_add_queue(s-vdev, VIRTIO_SCSI_VQ_SIZE,
virtio_scsi_handle_ctrl);
@@ -647,6 +683,9 @@ void virtio_scsi_exit(VirtIODevice *vdev)
{
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
unregister_savevm(s-qdev, virtio-scsi, s);
-vhost_dev_cleanup(s-vhost_scsi);
+
+/* This will stop vhost backend if appropriate. */
+virtio_scsi_set_status(vdev, 0);
+
virtio_cleanup(vdev);
}
--
1.7.2.5
