From: Osier Yang Date: Tue, 17 Jan 2012 20:02:05 +0000 (+0800) Subject: qemu: Introduce inactive PCI device list X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=6be610bfaae08655eaf93f9638d4c6636c00343f;p=people%2Fliuw%2Flibxenctrl-split%2Flibvirt.git 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 argument 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 introducing an inactive PCI device list (just like qemu_driver->activePciHostdevs), and the whole logic is: * Add the device to inactive list during nodedev-dettach * Remove the device from inactive list during nodedev-reattach * Remove the device from inactive list during attach-device (for non-managed device) * Add the device to inactive list after detach-device, only if the device is not managed With the above, we have a 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; --- diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h index d8d7915f7..7d7982377 100644 --- a/src/qemu/qemu_conf.h +++ b/src/qemu/qemu_conf.h @@ -1,7 +1,7 @@ /* * qemu_conf.h: QEMU configuration management * - * Copyright (C) 2006-2007, 2009-2011 Red Hat, Inc. + * Copyright (C) 2006-2007, 2009-2012 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -128,6 +128,9 @@ struct qemud_driver { pciDeviceList *activePciHostdevs; usbDeviceList *activeUsbHostdevs; + /* The devices which is are not in use by the host or any guest. */ + pciDeviceList *inactivePciHostdevs; + virBitmapPtr reservedVNCPorts; virSysinfoDefPtr hostsysinfo; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 712f1fc45..47e23802f 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); @@ -9211,6 +9215,7 @@ qemudNodeDeviceDettach (virNodeDevicePtr dev) pciDevice *pci; unsigned domain, bus, slot, function; int ret = -1; + bool in_inactive_list = false; if (qemudNodeDeviceGetPciInfo(dev, &domain, &bus, &slot, &function) < 0) return -1; @@ -9220,13 +9225,17 @@ qemudNodeDeviceDettach (virNodeDevicePtr dev) return -1; qemuDriverLock(driver); - if (pciDettachDevice(pci, driver->activePciHostdevs) < 0) + in_inactive_list = pciDeviceListFind(driver->inactivePciHostdevs, pci); + + if (pciDettachDevice(pci, driver->activePciHostdevs, + driver->inactivePciHostdevs) < 0) goto out; ret = 0; out: qemuDriverUnlock(driver); - pciFreeDevice(pci); + if (in_inactive_list) + pciFreeDevice(pci); return ret; } @@ -9248,7 +9257,8 @@ 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 +9285,8 @@ 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 c7adb1d68..b3cad8e7a 100644 --- a/src/qemu/qemu_hostdev.c +++ b/src/qemu/qemu_hostdev.c @@ -1,7 +1,7 @@ /* * qemu_hostdev.c: QEMU hostdev management * - * Copyright (C) 2006-2007, 2009-2011 Red Hat, Inc. + * Copyright (C) 2006-2007, 2009-2012 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -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 have been inactive. + */ + if (!pciDeviceGetManaged(dev)) { + pciDeviceListAdd(driver->inactivePciHostdevs, dev); return; + } while (pciWaitForDeviceCleanup(dev, "kvm_assigned_device") && retries) { @@ -454,7 +466,8 @@ void qemuReattachPciDevice(pciDevice *dev, struct qemud_driver *driver) retries--; } - if (pciReAttachDevice(dev, driver->activePciHostdevs) < 0) { + if (pciReAttachDevice(dev, driver->activePciHostdevs, + driver->inactivePciHostdevs) < 0) { virErrorPtr err = virGetLastError(); VIR_ERROR(_("Failed to re-attach PCI device: %s"), err ? err->message : _("unknown error")); @@ -503,7 +516,8 @@ 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 dc40d2f3f..4b608397a 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) == 0) qemuReattachPciDevice(activePci, driver); else ret = -1; diff --git a/src/util/pci.c b/src/util/pci.c index 17cde81bf..633dcd89e 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 (inactiveDevs && !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 +1164,14 @@ pciReAttachDevice(pciDevice *dev, pciDeviceList *activeDevs) return -1; } - return pciUnbindDeviceFromStub(dev, driver); + if (pciUnbindDeviceFromStub(dev, driver) < 0) + return -1; + + /* Steal the dev from list inactiveDevs */ + if (inactiveDevs) + pciDeviceListSteal(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 5493e0aed..25b5b662f 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 20671c0d6..520ec03a8 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;