[libvirt] [PATCH v2 08/11] qemu: handle host usb device plug/unplug when libvirtd is down
Somebody can easily unplug usb device from host while libvirtd is being
stopped. Also usb device can be plugged or unplugged/plugged back and so
forth. Let's handle such cases.
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com>
---
src/qemu/qemu_process.c | 55 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index c9921646e9..8bec36fe2c 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3749,6 +3749,58 @@ qemuProcessUpdateDevices(virQEMUDriverPtr driver,
return ret;
}
+
+static int
+qemuProcessReattachUSBDevices(virQEMUDriverPtr driver,
+ virDomainObjPtr vm)
+{
+ size_t i;
+
+ for (i = 0; i < vm->def->nhostdevs; i++) {
+ virDomainHostdevDefPtr hostdev = vm->def->hostdevs[i];
+ virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb;
+
+ if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
+ continue;
+
+ /* don't mess with devices that don't use stable host addressing
+ * with respect to unplug/plug to host
+ */
+ if (!usbsrc->vendor || !usbsrc->product)
+ continue;
+
+ if (!usbsrc->bus && !usbsrc->device) {
+ int num;
+
+ if ((num = virUSBDeviceFindByVendor(usbsrc->vendor, usbsrc->product,
+ NULL, false, NULL)) < 0)
+ return -1;
+
+ if (num > 0 &&
+ qemuDomainAttachHostDevice(driver, vm, hostdev) < 0)
+ return -1;
+ } else {
+ virUSBDevicePtr usb;
+
+ if (virUSBDeviceFindByBus(usbsrc->bus, usbsrc->device,
+ NULL, false, &usb) < 0)
+ return -1;
+
+ if (!usb) {
+ virDomainDeviceDef dev = { .type = VIR_DOMAIN_DEVICE_HOSTDEV };
+
+ dev.data.hostdev = hostdev;
+ if (qemuDomainDetachDeviceLive(vm, &dev, driver, true, true) < 0)
+ return -1;
+ }
+ virUSBDeviceFree(usb);
+ }
+ }
+
+ return 0;
+}
+
+
static int
qemuDomainPerfRestart(virDomainObjPtr vm)
{
@@ -8206,6 +8258,9 @@ 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