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[libvirt] [PATCH] qemu: Introduce inactive PCI device list



pciTrySecondaryBusReset checks if there is active device on the
same bus, however, qemu driver doesn't maintain an effective
list for the inactive devices, and it passes meaningless argment
for parameter "inactiveDevs". e.g. (qemuPrepareHostdevPCIDevices)

if (!(pcidevs = qemuGetPciHostDeviceList(hostdevs, nhostdevs)))
    return -1;

...skipped...

if (pciResetDevice(dev, driver->activePciHostdevs, pcidevs) < 0)
    goto reattachdevs;

NB, the "pcidevs" used above are extracted from domain def, and
thus one won't be able to attach a device of which bus has other
device even detached from host (nodedev-detach). To see more
details of the problem:

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=773667

This patch is to resolve the problem by introduce an inactive
PCI device list (just like qemu_driver->activePciHostdevs), and
the whole logic is:

  * Add the device to inactive list when do nodedev-dettach
  * Remove the device from inactive list when do nodedev-reattach
  * Remove the device from inactive list when do attach-device
    (for not managed device)
  * Add the device to inactive list after detach-device, only
    if the device is not managed
  * Don't do any work if the device is managed, as it manages
    there is no gap in the whole workflow for another guest
    who wants to

With above, we have sufficient inactive PCI device list, and thus
we can use it for pciResetDevice. e.g.(qemuPrepareHostdevPCIDevices)

if (pciResetDevice(dev, driver->activePciHostdevs,
                   driver->inactivePciHostdevs) < 0)
    goto reattachdevs;
---
 src/qemu/qemu_conf.h    |    5 +++++
 src/qemu/qemu_driver.c  |   13 ++++++++++---
 src/qemu/qemu_hostdev.c |   31 ++++++++++++++++++++++---------
 src/qemu/qemu_hotplug.c |    3 ++-
 src/util/pci.c          |   27 +++++++++++++++++++++++----
 src/util/pci.h          |    8 ++++++--
 src/xen/xen_driver.c    |    4 ++--
 7 files changed, 70 insertions(+), 21 deletions(-)

diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index d8d7915..3f1b668 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -128,6 +128,11 @@ struct qemud_driver {
     pciDeviceList *activePciHostdevs;
     usbDeviceList *activeUsbHostdevs;
 
+    /* The device which is not used by both host
+     * and any guest.
+     */
+    pciDeviceList *inactivePciHostdevs;
+
     virBitmapPtr reservedVNCPorts;
 
     virSysinfoDefPtr hostsysinfo;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 712f1fc..159911c 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -588,6 +588,9 @@ qemudStartup(int privileged) {
     if ((qemu_driver->activeUsbHostdevs = usbDeviceListNew()) == NULL)
         goto error;
 
+    if ((qemu_driver->inactivePciHostdevs = pciDeviceListNew()) == NULL)
+        goto error;
+
     if (privileged) {
         if (chown(qemu_driver->libDir, qemu_driver->user, qemu_driver->group) < 0) {
             virReportSystemError(errno,
@@ -778,6 +781,7 @@ qemudShutdown(void) {
 
     qemuDriverLock(qemu_driver);
     pciDeviceListFree(qemu_driver->activePciHostdevs);
+    pciDeviceListFree(qemu_driver->inactivePciHostdevs);
     usbDeviceListFree(qemu_driver->activeUsbHostdevs);
     virCapabilitiesFree(qemu_driver->caps);
 
@@ -9220,7 +9224,8 @@ qemudNodeDeviceDettach (virNodeDevicePtr dev)
         return -1;
 
     qemuDriverLock(driver);
-    if (pciDettachDevice(pci, driver->activePciHostdevs) < 0)
+    if (pciDettachDevice(pci, driver->activePciHostdevs,
+                         driver->inactivePciHostdevs) < 0)
         goto out;
 
     ret = 0;
@@ -9248,7 +9253,8 @@ qemudNodeDeviceReAttach (virNodeDevicePtr dev)
     pciDeviceReAttachInit(pci);
 
     qemuDriverLock(driver);
-    if (pciReAttachDevice(pci, driver->activePciHostdevs) < 0)
+    if (pciReAttachDevice(pci, driver->activePciHostdevs,
+                          driver->inactivePciHostdevs) < 0)
         goto out;
 
     ret = 0;
@@ -9275,7 +9281,8 @@ qemudNodeDeviceReset (virNodeDevicePtr dev)
 
     qemuDriverLock(driver);
 
-    if (pciResetDevice(pci, driver->activePciHostdevs, NULL) < 0)
+    if (pciResetDevice(pci, driver->activePciHostdevs,
+                       driver->inactivePciHostdevs) < 0)
         goto out;
 
     ret = 0;
diff --git a/src/qemu/qemu_hostdev.c b/src/qemu/qemu_hostdev.c
index c7adb1d..82ad9de 100644
--- a/src/qemu/qemu_hostdev.c
+++ b/src/qemu/qemu_hostdev.c
@@ -212,7 +212,7 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
     for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
         pciDevice *dev = pciDeviceListGet(pcidevs, i);
         if (pciDeviceGetManaged(dev) &&
-            pciDettachDevice(dev, driver->activePciHostdevs) < 0)
+            pciDettachDevice(dev, driver->activePciHostdevs, NULL) < 0)
             goto reattachdevs;
     }
 
@@ -220,7 +220,8 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
      * can safely reset them */
     for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
         pciDevice *dev = pciDeviceListGet(pcidevs, i);
-        if (pciResetDevice(dev, driver->activePciHostdevs, pcidevs) < 0)
+        if (pciResetDevice(dev, driver->activePciHostdevs,
+                           driver->inactivePciHostdevs) < 0)
             goto reattachdevs;
     }
 
@@ -233,7 +234,13 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
         }
     }
 
-    /* Loop 5: Now set the used_by_domain of the device in
+    /* Loop 5: Now remove the devices from inactive list. */
+    for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
+         pciDevice *dev = pciDeviceListGet(pcidevs, i);
+         pciDeviceListDel(driver->inactivePciHostdevs, dev);
+    }
+
+    /* Loop 6: Now set the used_by_domain of the device in
      * driver->activePciHostdevs as domain name.
      */
     for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
@@ -245,7 +252,7 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
         pciDeviceSetUsedBy(activeDev, name);
     }
 
-    /* Loop 6: Now set the original states for hostdev def */
+    /* Loop 7: Now set the original states for hostdev def */
     for (i = 0; i < nhostdevs; i++) {
         pciDevice *dev;
         pciDevice *pcidev;
@@ -277,7 +284,7 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
         pciFreeDevice(dev);
     }
 
-    /* Loop 7: Now steal all the devices from pcidevs */
+    /* Loop 8: Now steal all the devices from pcidevs */
     while (pciDeviceListCount(pcidevs) > 0) {
         pciDevice *dev = pciDeviceListGet(pcidevs, 0);
         pciDeviceListSteal(pcidevs, dev);
@@ -298,7 +305,7 @@ inactivedevs:
 reattachdevs:
     for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
         pciDevice *dev = pciDeviceListGet(pcidevs, i);
-        pciReAttachDevice(dev, driver->activePciHostdevs);
+        pciReAttachDevice(dev, driver->activePciHostdevs, NULL);
     }
 
 cleanup:
@@ -445,8 +452,13 @@ void qemuReattachPciDevice(pciDevice *dev, struct qemud_driver *driver)
 {
     int retries = 100;
 
-    if (!pciDeviceGetManaged(dev))
+    /* If the device is not managed and was attached to guest
+     * successfully, it must had be inactive.
+     */
+    if (!pciDeviceGetManaged(dev)) {
+        pciDeviceListAdd(driver->inactivePciHostdevs, dev);
         return;
+    }
 
     while (pciWaitForDeviceCleanup(dev, "kvm_assigned_device")
            && retries) {
@@ -454,7 +466,7 @@ void qemuReattachPciDevice(pciDevice *dev, struct qemud_driver *driver)
         retries--;
     }
 
-    if (pciReAttachDevice(dev, driver->activePciHostdevs) < 0) {
+    if (pciReAttachDevice(dev, driver->activePciHostdevs, NULL) < 0) {
         virErrorPtr err = virGetLastError();
         VIR_ERROR(_("Failed to re-attach PCI device: %s"),
                   err ? err->message : _("unknown error"));
@@ -503,7 +515,8 @@ void qemuDomainReAttachHostdevDevices(struct qemud_driver *driver,
 
     for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
         pciDevice *dev = pciDeviceListGet(pcidevs, i);
-        if (pciResetDevice(dev, driver->activePciHostdevs, pcidevs) < 0) {
+        if (pciResetDevice(dev, driver->activePciHostdevs,
+                           driver->inactivePciHostdevs) < 0) {
             virErrorPtr err = virGetLastError();
             VIR_ERROR(_("Failed to reset PCI device: %s"),
                       err ? err->message : _("unknown error"));
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index dc40d2f..6080d38 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -2029,7 +2029,8 @@ qemuDomainDetachHostPciDevice(struct qemud_driver *driver,
                        detach->source.subsys.u.pci.function);
     if (pci) {
         activePci = pciDeviceListSteal(driver->activePciHostdevs, pci);
-        if (pciResetDevice(activePci, driver->activePciHostdevs, NULL))
+        if (pciResetDevice(activePci, driver->activePciHostdevs,
+                           driver->inactivePciHostdevs))
             qemuReattachPciDevice(activePci, driver);
         else
             ret = -1;
diff --git a/src/util/pci.c b/src/util/pci.c
index 17cde81..557bd34 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1117,7 +1117,9 @@ cleanup:
 }
 
 int
-pciDettachDevice(pciDevice *dev, pciDeviceList *activeDevs)
+pciDettachDevice(pciDevice *dev,
+                 pciDeviceList *activeDevs,
+                 pciDeviceList *inactiveDevs)
 {
     const char *driver = pciFindStubDriver();
     if (!driver) {
@@ -1132,11 +1134,22 @@ pciDettachDevice(pciDevice *dev, pciDeviceList *activeDevs)
         return -1;
     }
 
-    return pciBindDeviceToStub(dev, driver);
+    if (pciBindDeviceToStub(dev, driver) < 0)
+        return -1;
+
+    /* Add the dev into list inactiveDevs */
+    if (!pciDeviceListFind(inactiveDevs, dev)) {
+        if (pciDeviceListAdd(inactiveDevs, dev) < 0)
+            return -1;
+    }
+
+    return 0;
 }
 
 int
-pciReAttachDevice(pciDevice *dev, pciDeviceList *activeDevs)
+pciReAttachDevice(pciDevice *dev,
+                  pciDeviceList *activeDevs,
+                  pciDeviceList *inactiveDevs)
 {
     const char *driver = pciFindStubDriver();
     if (!driver) {
@@ -1151,7 +1164,13 @@ pciReAttachDevice(pciDevice *dev, pciDeviceList *activeDevs)
         return -1;
     }
 
-    return pciUnbindDeviceFromStub(dev, driver);
+    if (pciUnbindDeviceFromStub(dev, driver) < 0)
+        return -1;
+
+    /* Remove the dev from list inactiveDevs */
+    pciDeviceListDel(inactiveDevs, dev);
+
+    return 0;
 }
 
 /* Certain hypervisors (like qemu/kvm) map the PCI bar(s) on
diff --git a/src/util/pci.h b/src/util/pci.h
index 5493e0a..25b5b66 100644
--- a/src/util/pci.h
+++ b/src/util/pci.h
@@ -40,8 +40,12 @@ pciDevice *pciGetDevice      (unsigned       domain,
                               unsigned       function);
 void       pciFreeDevice     (pciDevice     *dev);
 const char *pciDeviceGetName (pciDevice     *dev);
-int        pciDettachDevice  (pciDevice     *dev, pciDeviceList *activeDevs);
-int        pciReAttachDevice (pciDevice     *dev, pciDeviceList *activeDevs);
+int        pciDettachDevice  (pciDevice     *dev,
+                              pciDeviceList *activeDevs,
+                              pciDeviceList *inactiveDevs);
+int        pciReAttachDevice (pciDevice     *dev,
+                              pciDeviceList *activeDevs,
+                              pciDeviceList *inactiveDevs);
 int        pciResetDevice    (pciDevice     *dev,
                               pciDeviceList *activeDevs,
                               pciDeviceList *inactiveDevs);
diff --git a/src/xen/xen_driver.c b/src/xen/xen_driver.c
index 20671c0..520ec03 100644
--- a/src/xen/xen_driver.c
+++ b/src/xen/xen_driver.c
@@ -1985,7 +1985,7 @@ xenUnifiedNodeDeviceDettach (virNodeDevicePtr dev)
     if (!pci)
         return -1;
 
-    if (pciDettachDevice(pci, NULL) < 0)
+    if (pciDettachDevice(pci, NULL, NULL) < 0)
         goto out;
 
     ret = 0;
@@ -2075,7 +2075,7 @@ xenUnifiedNodeDeviceReAttach (virNodeDevicePtr dev)
         goto out;
     }
 
-    if (pciReAttachDevice(pci, NULL) < 0)
+    if (pciReAttachDevice(pci, NULL, NULL) < 0)
         goto out;
 
     ret = 0;
-- 
1.7.7.3


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