xen PV passthru: assign SR-IOV virtual functions to separate virtual slots
authorLaszlo Ersek <lersek@redhat.com>
Wed, 17 Oct 2012 09:55:55 +0000 (11:55 +0200)
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Fri, 19 Oct 2012 19:17:47 +0000 (15:17 -0400)
VFs are reported as single-function devices in PCI_HEADER_TYPE, which
causes pci_scan_slot() in the PV domU to skip all VFs beyond #0 in the
pciback-provided slot. Avoid this by assigning each VF to a separate
virtual slot.

Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
drivers/xen/xen-pciback/vpci.c

index 46d140baebd8770463b9d37399f5149220920532..0f478ac483cd418e1a8a0b84fdb1b35651ce6404 100644 (file)
@@ -89,9 +89,15 @@ static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
 
        mutex_lock(&vpci_dev->lock);
 
-       /* Keep multi-function devices together on the virtual PCI bus */
-       for (slot = 0; slot < PCI_SLOT_MAX; slot++) {
-               if (!list_empty(&vpci_dev->dev_list[slot])) {
+       /*
+        * Keep multi-function devices together on the virtual PCI bus, except
+        * virtual functions.
+        */
+       if (!dev->is_virtfn) {
+               for (slot = 0; slot < PCI_SLOT_MAX; slot++) {
+                       if (list_empty(&vpci_dev->dev_list[slot]))
+                               continue;
+
                        t = list_entry(list_first(&vpci_dev->dev_list[slot]),
                                       struct pci_dev_entry, list);
 
@@ -116,7 +122,7 @@ static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
                               pci_name(dev), slot);
                        list_add_tail(&dev_entry->list,
                                      &vpci_dev->dev_list[slot]);
-                       func = PCI_FUNC(dev->devfn);
+                       func = dev->is_virtfn ? 0 : PCI_FUNC(dev->devfn);
                        goto unlock;
                }
        }