[libvirt] [PATCH 19/23] Add support for hotplug/unplug of USB host devices in LXC
Daniel P. Berrange
berrange at redhat.com
Fri Nov 30 20:26:33 UTC 2012
From: "Daniel P. Berrange" <berrange at redhat.com>
Wire up the attach/detach device drivers in LXC to support the
hotplug/unplug of USB host devices.
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
src/lxc/lxc_driver.c | 332 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 332 insertions(+)
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 08ac70d..50050cf 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -39,6 +39,7 @@
#include "virterror_internal.h"
#include "logging.h"
#include "datatypes.h"
+#include "lxc_cgroup.h"
#include "lxc_conf.h"
#include "lxc_container.h"
#include "lxc_domain.h"
@@ -3205,6 +3206,195 @@ cleanup:
static int
+lxcDomainAttachDeviceHostdevSubsysUSBLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ virLXCDomainObjPrivatePtr priv = vm->privateData;
+ virDomainHostdevDefPtr def = dev->data.hostdev;
+ int ret = -1;
+ char *vroot = NULL;
+ char *src = NULL;
+ char *dstdir = NULL;
+ char *dstfile = NULL;
+ struct stat sb;
+ mode_t mode;
+ bool created = false;
+ usbDeviceList *list = NULL;
+ usbDevice *usb = NULL;
+ virCgroupPtr group = NULL;
+
+ if (virAsprintf(&vroot, "/proc/%llu/root",
+ (unsigned long long)priv->initpid) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (virAsprintf(&dstdir, "%s/dev/bus/usb/%03d",
+ vroot,
+ def->source.subsys.u.usb.bus) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (virAsprintf(&dstfile, "%s/%03d",
+ dstdir,
+ def->source.subsys.u.usb.device) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (virAsprintf(&src, "/dev/bus/usb/%03d/%03d",
+ def->source.subsys.u.usb.bus,
+ def->source.subsys.u.usb.device) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (!lxcCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_DEVICES)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("devices cgroup isn't mounted"));
+ goto cleanup;
+ }
+
+ if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("cannot find cgroup for domain %s"), vm->def->name);
+ goto cleanup;
+ }
+
+ if (VIR_REALLOC_N(vm->def->hostdevs, vm->def->nhostdevs+1) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (!(usb = usbGetDevice(def->source.subsys.u.usb.bus,
+ def->source.subsys.u.usb.device, vroot)))
+ goto cleanup;
+
+ if (!(list = usbDeviceListNew()))
+ goto cleanup;
+
+ if (usbDeviceListAdd(list, usb) < 0) {
+ usbFreeDevice(usb);
+ usb = NULL;
+ goto cleanup;
+ }
+
+ if (virLXCPrepareHostdevUSBDevices(driver, vm->def->name, list) < 0) {
+ usb = NULL;
+ goto cleanup;
+ }
+
+ usbDeviceListSteal(list, usb);
+
+ if (stat(src, &sb) < 0) {
+ virReportSystemError(errno,
+ _("Unable to access %s"), src);
+ goto cleanup;
+ }
+
+ if (!S_ISCHR(sb.st_mode)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("USB source %s was not a character device"),
+ src);
+ goto cleanup;
+ }
+
+ mode = 0700 | S_IFCHR;
+
+ if (virFileMakePath(dstdir) < 0) {
+ virReportSystemError(errno,
+ _("Unable to create %s"), dstdir);
+ goto cleanup;
+ }
+
+ VIR_DEBUG("Creating dev %s (%d,%d)",
+ dstfile, major(sb.st_rdev), minor(sb.st_rdev));
+ if (mknod(dstfile, mode, sb.st_rdev) < 0) {
+ virReportSystemError(errno,
+ _("Unable to create device %s"),
+ dstfile);
+ goto cleanup;
+ }
+ created = true;
+
+ if (virSecurityManagerSetHostdevLabel(driver->securityManager,
+ vm->def, def, vroot) < 0)
+ goto cleanup;
+
+ if (usbDeviceFileIterate(usb,
+ virLXCSetupHostUsbDeviceCgroup,
+ group) < 0)
+ goto cleanup;
+
+ vm->def->hostdevs[vm->def->nhostdevs++] = def;
+
+ ret = 0;
+
+cleanup:
+ virDomainAuditHostdev(vm, def, "attach", ret == 0);
+ if (ret < 0 && created)
+ unlink(dstfile);
+
+ usbDeviceListFree(list);
+ if (ret < 0 && usb)
+ usbDeviceListSteal(driver->activeUsbHostdevs, usb);
+
+ virCgroupFree(&group);
+ VIR_FREE(src);
+ VIR_FREE(dstfile);
+ VIR_FREE(dstdir);
+ VIR_FREE(vroot);
+ return ret;
+}
+
+
+static int
+lxcDomainAttachDeviceHostdevSubsysLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ switch (dev->data.hostdev->source.subsys.type) {
+ case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
+ return lxcDomainAttachDeviceHostdevSubsysUSBLive(driver, vm, dev);
+
+ default:
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Unsupported host device type %s"),
+ virDomainHostdevSubsysTypeToString(dev->data.hostdev->source.subsys.type));
+ return -1;
+ }
+}
+
+
+static int
+lxcDomainAttachDeviceHostdevLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ virLXCDomainObjPrivatePtr priv = vm->privateData;
+
+ if (!priv->initpid) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("Cannot attach hostdev until init PID is known"));
+ return -1;
+ }
+
+ switch (dev->data.hostdev->mode) {
+ case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
+ return lxcDomainAttachDeviceHostdevSubsysLive(driver, vm, dev);
+
+ default:
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Unsupported host device mode %s"),
+ virDomainHostdevModeTypeToString(dev->data.hostdev->mode));
+ return -1;
+ }
+}
+
+
+static int
lxcDomainAttachDeviceLive(virConnectPtr conn,
virLXCDriverPtr driver,
virDomainObjPtr vm,
@@ -3226,6 +3416,12 @@ lxcDomainAttachDeviceLive(virConnectPtr conn,
dev->data.net = NULL;
break;
+ case VIR_DOMAIN_DEVICE_HOSTDEV:
+ ret = lxcDomainAttachDeviceHostdevLive(driver, vm, dev);
+ if (!ret)
+ dev->data.disk = NULL;
+ break;
+
default:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("device type '%s' cannot be attached"),
@@ -3375,6 +3571,138 @@ cleanup:
static int
+lxcDomainDetachDeviceHostdevUSBLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ virLXCDomainObjPrivatePtr priv = vm->privateData;
+ virDomainHostdevDefPtr def = NULL;
+ virCgroupPtr group = NULL;
+ int idx, ret = -1;
+ char *dst = NULL;
+ char *vroot = NULL;
+ usbDevice *usb = NULL;
+
+ if (!priv->initpid) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("Cannot attach hostdev until init PID is known"));
+ goto cleanup;
+ }
+
+
+ if ((idx = virDomainHostdevFind(vm->def,
+ dev->data.hostdev,
+ &def)) < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("usb device not found"));
+ goto cleanup;
+ }
+
+ if (virAsprintf(&vroot, "/proc/%llu/root",
+ (unsigned long long)priv->initpid) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (virAsprintf(&dst, "%s/dev/bus/usb/%03d/%03d",
+ vroot,
+ def->source.subsys.u.usb.bus,
+ def->source.subsys.u.usb.device) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if (!lxcCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_DEVICES)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("devices cgroup isn't mounted"));
+ goto cleanup;
+ }
+
+ if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("cannot find cgroup for domain %s"), vm->def->name);
+ goto cleanup;
+ }
+
+ if (!(usb = usbGetDevice(def->source.subsys.u.usb.bus,
+ def->source.subsys.u.usb.device, vroot)))
+ goto cleanup;
+
+ VIR_DEBUG("Unlinking %s", dst);
+ if (unlink(dst) < 0 && errno != ENOENT) {
+ virDomainAuditHostdev(vm, def, "detach", false);
+ virReportSystemError(errno,
+ _("Unable to remove device %s"), dst);
+ goto cleanup;
+ }
+ virDomainAuditHostdev(vm, def, "detach", true);
+
+ if (usbDeviceFileIterate(usb,
+ virLXCTeardownHostUsbDeviceCgroup,
+ group) < 0)
+ VIR_WARN("cannot deny device %s for domain %s",
+ dst, vm->def->name);
+
+ usbDeviceListDel(driver->activeUsbHostdevs, usb);
+
+ virDomainHostdevRemove(vm->def, idx);
+ virDomainHostdevDefFree(def);
+
+ ret = 0;
+
+cleanup:
+ usbFreeDevice(usb);
+ VIR_FREE(dst);
+ VIR_FREE(vroot);
+ virCgroupFree(&group);
+ return ret;
+}
+
+static int
+lxcDomainDetachDeviceHostdevSubsysLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ switch (dev->data.hostdev->source.subsys.type) {
+ case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
+ return lxcDomainDetachDeviceHostdevUSBLive(driver, vm, dev);
+
+ default:
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Unsupported host device type %s"),
+ virDomainHostdevSubsysTypeToString(dev->data.hostdev->source.subsys.type));
+ return -1;
+ }
+}
+
+
+static int
+lxcDomainDetachDeviceHostdevLive(virLXCDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainDeviceDefPtr dev)
+{
+ virLXCDomainObjPrivatePtr priv = vm->privateData;
+
+ if (!priv->initpid) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("Cannot attach hostdev until init PID is known"));
+ return -1;
+ }
+
+ switch (dev->data.hostdev->mode) {
+ case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
+ return lxcDomainDetachDeviceHostdevSubsysLive(driver, vm, dev);
+
+ default:
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Unsupported host device mode %s"),
+ virDomainHostdevModeTypeToString(dev->data.hostdev->mode));
+ return -1;
+ }
+}
+
+
+static int
lxcDomainDetachDeviceLive(virLXCDriverPtr driver,
virDomainObjPtr vm,
virDomainDeviceDefPtr dev)
@@ -3390,6 +3718,10 @@ lxcDomainDetachDeviceLive(virLXCDriverPtr driver,
ret = lxcDomainDetachDeviceNetLive(vm, dev);
break;
+ case VIR_DOMAIN_DEVICE_HOSTDEV:
+ ret = lxcDomainDetachDeviceHostdevLive(driver, vm, dev);
+ break;
+
default:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("device type '%s' cannot be detached"),
--
1.8.0.1
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