pci: initialize state values on reattach

add a new API pciDeviceReAttachInit() in pci.c to initialize state values for nodedev reattach

Initialize three state value of device driver to 1. This is just for a new call to
qemudNodeDeviceReAttach()

AUTHORS

@@ -180,6 +180,7 @@ Patches have also been contributed by:
   David S. Wang        <dwang2@cisco.com>
   Ruben Kerkhof        <ruben@rubenkerkhof.com>
   Scott Moser          <smoser@ubuntu.com>
+  Guannan Ren          <gren@redhat.com>
 
   [....send patches to get your name here....]
 

src/libvirt_private.syms

@@ -801,6 +801,7 @@ pciDeviceListFree;
 pciDeviceListGet;
 pciDeviceListNew;
 pciDeviceListSteal;
+pciDeviceReAttachInit;
 pciDeviceSetManaged;
 pciFreeDevice;
 pciGetDevice;

src/qemu/qemu_driver.c

@@ -7197,6 +7197,8 @@ qemudNodeDeviceReAttach (virNodeDevicePtr dev)
     if (!pci)
         return -1;
 
+    pciDeviceReAttachInit(pci);
+
     qemuDriverLock(driver);
     if (pciReAttachDevice(pci, driver->activePciHostdevs) < 0)
         goto out;

src/util/pci.c

@@ -1382,6 +1382,14 @@ unsigned pciDeviceGetManaged(pciDevice *dev)
     return dev->managed;
 }
 
+void pciDeviceReAttachInit(pciDevice *pci)
+{
+    pci->unbind_from_stub = 1;
+    pci->remove_slot = 1;
+    pci->reprobe = 1;
+}
+
+
 pciDeviceList *
 pciDeviceListNew(void)
 {

src/util/pci.h

@@ -40,6 +40,7 @@ int        pciResetDevice    (pciDevice     *dev,
 void      pciDeviceSetManaged(pciDevice     *dev,
                               unsigned       managed);
 unsigned  pciDeviceGetManaged(pciDevice     *dev);
+void      pciDeviceReAttachInit(pciDevice   *dev);
 
 pciDeviceList *pciDeviceListNew  (void);
 void           pciDeviceListFree (pciDeviceList *list);