[libvirt] [PATCH 1/7] hostdev: Add reattachPCIDevices()
Andrea Bolognani
abologna at redhat.com
Tue Jan 19 15:36:03 UTC 2016
This function replaces virHostdevReattachPCIDevice() and handles several
PCI devices instead of requiring to be called once for every device.
The handling of active and inactive devices is updated and made more
explicit, which means virHostdevReAttachPCIDevices() has to be updated
as well.
---
src/util/virhostdev.c | 170 ++++++++++++++++++++++++++++++--------------------
1 file changed, 103 insertions(+), 67 deletions(-)
diff --git a/src/util/virhostdev.c b/src/util/virhostdev.c
index f31ad41..0f258a5 100644
--- a/src/util/virhostdev.c
+++ b/src/util/virhostdev.c
@@ -526,6 +526,73 @@ virHostdevNetConfigRestore(virDomainHostdevDefPtr hostdev,
return ret;
}
+/**
+ * reattachPCIDevices:
+ * @mgr: hostdev manager
+ * @pcidevs: PCI devices to be reattached
+ * @skipUnmanaged: whether to skip unmanaged devices
+ *
+ * Reattach PCI devices to the host.
+ *
+ * All devices in @pcidevs must have already been marked as inactive, and
+ * the PCI related parts of @mgr (inactivePCIHostdevs, activePCIHostdevs)
+ * must have been locked beforehand using virObjectLock().
+ *
+ * Returns: 0 on success, <0 on failure
+ */
+static int
+reattachPCIDevices(virHostdevManagerPtr mgr,
+ virPCIDeviceListPtr pcidevs,
+ bool skipUnmanaged)
+{
+ size_t i;
+ int ret = -1;
+
+ for (i = 0; i < virPCIDeviceListCount(pcidevs); i++) {
+ virPCIDevicePtr tmp = virPCIDeviceListGet(pcidevs, i);
+ virPCIDevicePtr dev;
+
+ /* Retrieve the actual device from the inactive list */
+ if (!(dev = virPCIDeviceListFind(mgr->inactivePCIHostdevs, tmp))) {
+ VIR_DEBUG("PCI device %s is not marked as inactive",
+ virPCIDeviceGetName(tmp));
+ goto out;
+ }
+
+ /* Skip unmanaged devices if asked to do so */
+ if (!virPCIDeviceGetManaged(dev) && skipUnmanaged) {
+ VIR_DEBUG("Not reattaching unmanaged PCI device %s",
+ virPCIDeviceGetName(dev));
+ continue;
+ }
+
+ /* Wait for device cleanup if it is qemu/kvm */
+ if (virPCIDeviceGetStubDriver(dev) == VIR_PCI_STUB_DRIVER_KVM) {
+ int retries = 100;
+ while (virPCIDeviceWaitForCleanup(dev, "kvm_assigned_device")
+ && retries) {
+ usleep(100*1000);
+ retries--;
+ }
+ }
+
+ VIR_DEBUG("Reattaching PCI device %s", virPCIDeviceGetName(dev));
+ if (virPCIDeviceReattach(dev, mgr->activePCIHostdevs,
+ mgr->inactivePCIHostdevs) < 0) {
+ virErrorPtr err = virGetLastError();
+ VIR_ERROR(_("Failed to reattach PCI device: %s"),
+ err ? err->message : _("unknown error"));
+ virResetError(err);
+ goto out;
+ }
+ }
+
+ ret = 0;
+
+ out:
+ return ret;
+}
+
int
virHostdevPreparePCIDevices(virHostdevManagerPtr hostdev_mgr,
const char *drv_name,
@@ -753,45 +820,6 @@ virHostdevPreparePCIDevices(virHostdevManagerPtr hostdev_mgr,
return ret;
}
-/*
- * Pre-condition: inactivePCIHostdevs & activePCIHostdevs
- * are locked
- */
-static void
-virHostdevReattachPCIDevice(virPCIDevicePtr dev, virHostdevManagerPtr mgr)
-{
- /* If the device is not managed and was attached to guest
- * successfully, it must have been inactive.
- */
- if (!virPCIDeviceGetManaged(dev)) {
- VIR_DEBUG("Adding unmanaged PCI device %s to inactive list",
- virPCIDeviceGetName(dev));
- if (virPCIDeviceListAdd(mgr->inactivePCIHostdevs, dev) < 0)
- virPCIDeviceFree(dev);
- return;
- }
-
- /* Wait for device cleanup if it is qemu/kvm */
- if (virPCIDeviceGetStubDriver(dev) == VIR_PCI_STUB_DRIVER_KVM) {
- int retries = 100;
- while (virPCIDeviceWaitForCleanup(dev, "kvm_assigned_device")
- && retries) {
- usleep(100*1000);
- retries--;
- }
- }
-
- VIR_DEBUG("Reattaching PCI device %s", virPCIDeviceGetName(dev));
- if (virPCIDeviceReattach(dev, mgr->activePCIHostdevs,
- mgr->inactivePCIHostdevs) < 0) {
- virErrorPtr err = virGetLastError();
- VIR_ERROR(_("Failed to re-attach PCI device: %s"),
- err ? err->message : _("unknown error"));
- virResetError(err);
- }
- virPCIDeviceFree(dev);
-}
-
/* @oldStateDir:
* For upgrade purpose: see virHostdevNetConfigRestore
*/
@@ -803,7 +831,7 @@ virHostdevReAttachPCIDevices(virHostdevManagerPtr hostdev_mgr,
int nhostdevs,
const char *oldStateDir)
{
- virPCIDeviceListPtr pcidevs;
+ virPCIDeviceListPtr pcidevs = NULL;
size_t i;
if (!nhostdevs)
@@ -822,16 +850,11 @@ virHostdevReAttachPCIDevices(virHostdevManagerPtr hostdev_mgr,
goto cleanup;
}
- /* Loop through the assigned devices 4 times: 1) delete them all from
- * activePCIHostdevs, 2) restore network config of SRIOV netdevs, 3) Do a
- * PCI reset on each device, 4) reattach the devices to their host drivers
- * (managed) or add them to inactivePCIHostdevs (!managed).
- */
+ /* Reattaching devices to the host involves several steps; each of them
+ * is described at length below */
- /*
- * Loop 1: verify that each device in the hostdevs list really was in use
- * by this domain, and remove them all from the activePCIHostdevs list.
- */
+ /* Step 1: verify that each device in the hostdevs list really was in use
+ * by this domain */
i = 0;
while (i < virPCIDeviceListCount(pcidevs)) {
virPCIDevicePtr dev = virPCIDeviceListGet(pcidevs, i);
@@ -848,21 +871,32 @@ virHostdevReAttachPCIDevices(virHostdevManagerPtr hostdev_mgr,
continue;
}
}
+ i++;
+ }
+
+ /* Step 2: move all devices from the active list to the inactive list */
+ for (i = 0; i < virPCIDeviceListCount(pcidevs); i++) {
+ virPCIDevicePtr tmp = virPCIDeviceListGet(pcidevs, i);
+ virPCIDevicePtr dev;
VIR_DEBUG("Removing PCI device %s from active list",
+ virPCIDeviceGetName(tmp));
+ if (!(dev = virPCIDeviceListSteal(hostdev_mgr->activePCIHostdevs,
+ tmp)))
+ goto cleanup;
+
+ VIR_DEBUG("Adding PCI device %s to inactive list",
virPCIDeviceGetName(dev));
- virPCIDeviceListDel(hostdev_mgr->activePCIHostdevs, dev);
- i++;
+ if (virPCIDeviceListAdd(hostdev_mgr->inactivePCIHostdevs,
+ dev) < 0)
+ goto cleanup;
}
- /* At this point, any device that had been used by the guest is in
- * pcidevs, but has been removed from activePCIHostdevs.
- */
+ /* At this point, devices are no longer marked as active and have been
+ * marked as inactive instead */
- /*
- * Loop 2: restore original network config of hostdevs that used
- * <interface type='hostdev'>
- */
+ /* Step 3: restore original network config of hostdevs that used
+ * <interface type='hostdev'> */
for (i = 0; i < nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = hostdevs[i];
@@ -883,7 +917,7 @@ virHostdevReAttachPCIDevices(virHostdevManagerPtr hostdev_mgr,
}
}
- /* Loop 3: perform a PCI Reset on all devices */
+ /* Step 4: perform a PCI Reset on all devices */
for (i = 0; i < virPCIDeviceListCount(pcidevs); i++) {
virPCIDevicePtr dev = virPCIDeviceListGet(pcidevs, i);
@@ -897,16 +931,18 @@ virHostdevReAttachPCIDevices(virHostdevManagerPtr hostdev_mgr,
}
}
- /* Loop 4: reattach devices to their host drivers (if managed) or place
- * them on the inactive list (if not managed)
- */
- while (virPCIDeviceListCount(pcidevs) > 0) {
- virPCIDevicePtr dev = virPCIDeviceListStealIndex(pcidevs, 0);
- virHostdevReattachPCIDevice(dev, hostdev_mgr);
- }
+ /* Step 5: reattach managed devices to their host drivers; unmanaged
+ * devices need no further processing. reattachPCIDevices() will
+ * remove devices from the inactive list as they are reattached
+ * to the host */
+ ignore_value(reattachPCIDevices(hostdev_mgr, pcidevs, true));
+
+ /* At this point, all devices are either marked as inactive (if they
+ * were unmanaged), or have been reattached to the host driver (if they
+ * were managed) and are no longer tracked by any of our device lists */
- virObjectUnref(pcidevs);
cleanup:
+ virObjectUnref(pcidevs);
virObjectUnlock(hostdev_mgr->activePCIHostdevs);
virObjectUnlock(hostdev_mgr->inactivePCIHostdevs);
}
--
2.5.0
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