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Re: [libvirt] [PATCH] qemu: Honor the original properties of PCI device when detaching

On 10/17/2011 05:07 AM, Osier Yang wrote:
This patch fixes two problems:
     1) The device will be reattached to host even if it's not
        managed, as there is a "pciDeviceSetManaged".
     2) The device won't be reattached to host with original
        driver properly. As it doesn't honor the device original
        properties which are maintained by driver->activePciHostdevs.
  src/qemu/qemu_hotplug.c |   16 ++++++++--------
  1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index bfa524b..f3f0060 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1956,6 +1956,7 @@ int qemuDomainDetachHostPciDevice(struct qemud_driver *driver,
      qemuDomainObjPrivatePtr priv = vm->privateData;
      int i, ret;
      pciDevice *pci;
+    pciDevice *activePci;

      for (i = 0 ; i<  vm->def->nhostdevs ; i++) {
          if (vm->def->hostdevs[i]->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
@@ -2015,16 +2016,15 @@ int qemuDomainDetachHostPciDevice(struct qemud_driver *driver,
-    if (!pci)
-        ret = -1;
-    else {
-        pciDeviceSetManaged(pci, detach->managed);
-        pciDeviceListDel(driver->activePciHostdevs, pci);
-        if (pciResetDevice(pci, driver->activePciHostdevs, NULL)<  0)
+    if (pci) {
+        activePci = pciDeviceListSteal(driver->activePciHostdevs, pci);
+        if (pciResetDevice(activePci, driver->activePciHostdevs, NULL)<  0)
              ret = -1;
-        pciDeviceReAttachInit(pci);
-        qemuReattachPciDevice(pci, driver);
+        qemuReattachPciDevice(activePci, driver);

This calls qemuReattachPciDevice even if pciResetDevice failed. I don't think that is right.

However, I agree with you that hot-unplug cannot make a device managed if it was not already managed, and also that it should be using the device attributes from driver->activePciHostdevs rather than from the just-created pci in order to properly decide how much work to do on the unplug event.

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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