AuxXxilium/linux_dsm_epyc7002
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xen PV passthru: assign SR-IOV virtual functions to separate virtual slots

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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>
This commit is contained in:
Laszlo Ersek 2012-10-17 11:55:55 +02:00 committed by Konrad Rzeszutek Wilk
parent e9d1aa05da
commit 8a5248fe10
1 changed files with 10 additions and 4 deletions
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14
drivers/xen/xen-pciback/vpci.c
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@ -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;
}
}