Somebody can easily detach hostdev on node while libvirtd is being
stopped. Also hostdev can be attached or detached and attached back and
so forth. Let's handle such cases.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
---
 src/qemu/qemu_process.c | 49 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 5cb97de4f3..f70f0ae251 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3747,6 +3747,52 @@ qemuProcessUpdateDevices(virQEMUDriverPtr driver,
     return ret;
 }
 
+
+static int
+qemuProcessReattachUSBDevices(virQEMUDriverPtr driver,
+                              virDomainObjPtr vm)
+{
+    size_t i;
+
+    for (i = 0; i < vm->def->nhostdevs; i++) {
+        virDomainDeviceDef dev = { .type = VIR_DOMAIN_DEVICE_HOSTDEV };
+        virDomainHostdevDefPtr hostdev = vm->def->hostdevs[i];
+        virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb;
+        bool found;
+
+
+        if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
+            continue;
+
+        if (hostdev->missing) {
+            int num;
+
+            if ((num = virUSBDeviceFindByVendor(usbsrc->vendor, usbsrc->product,
+                                                NULL, false, NULL)) < 0)
+                return -1;
+
+            found = num != 0;
+        } else {
+            virUSBDevicePtr usb;
+
+            if (virUSBDeviceFindByBus(usbsrc->bus, usbsrc->device,
+                                      NULL, false, &usb) < 0)
+                return -1;
+
+            found = usb != NULL;
+            virUSBDeviceFree(usb);
+        }
+
+        dev.data.hostdev = hostdev;
+        if ((hostdev->missing ^ !found) &&
+            qemuDomainDetachDeviceLive(vm, &dev, driver, true, true) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+
 static int
 qemuDomainPerfRestart(virDomainObjPtr vm)
 {
@@ -8204,6 +8250,9 @@ qemuProcessReconnect(void *opaque)
     if (qemuProcessUpdateDevices(driver, obj) < 0)
         goto error;
 
+    if (qemuProcessReattachUSBDevices(driver, obj) < 0)
+        goto error;
+
     if (qemuRefreshPRManagerState(driver, obj) < 0)
         goto error;
 
-- 
2.23.0

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