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Subject[PATCH] uio/uio_pci_generic: Add SR-IOV support
From: David Woodhouse <>

Allow userspace to configure SR-IOV VFs through sysfs.

Currently, we need an in-kernel driver to permit this. But sometimes
*all* we want to do is enable the VFs so that we can assign them to
guests; we don't actually need to deal with the PF in any other way
from the host kernel. So let's make it possible to use UIO for that.

Signed-off-by: David Woodhouse <>
It's not entirely clear to me why we require the driver to "enable"
SR-IOV like this anyway — were there some which needed to do something
special and device-specific instead of just falling through to
pci_{en,dis}able_sriov(), such that we need to effectively whitelist
this in the driver rather than blacklisting the "problematic" ones via
PCI quirks?

drivers/uio/uio_pci_generic.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index a56fdf9..bd196f0 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -108,15 +108,27 @@ static void remove(struct pci_dev *pdev)
struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev);

+ pci_disable_sriov(pdev);

+static int sriov_configure(struct pci_dev *pdev, int num_vfs)
+ if (!num_vfs) {
+ pci_disable_sriov(pdev);
+ return 0;
+ }
+ return pci_enable_sriov(pdev, num_vfs);
static struct pci_driver uio_pci_driver = {
.name = "uio_pci_generic",
.id_table = NULL, /* only dynamic id's */
.probe = probe,
.remove = remove,
+ .sriov_configure = sriov_configure,

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