[libvirt PATCH 15/15] qemu: automatically bind to a vfio variant driver, if available
Rather than always binding to the vfio-pci driver, use
virPCIDeviceFindBestVFIOVariant() to see if the running kernel has a
VFIO variant driver available that is a better match for the device,
and if one is found, use that instead.
If a specific driver is named, that will still be used; this makes it
possible to force binding of vfio-pci if there is an issue with the
auto-selected variant driver.
Signed-off-by: Laine Stump <laine(a)redhat.com>
---
src/util/virpci.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/src/util/virpci.c b/src/util/virpci.c
index 70fcedc4a5..ff5349b70d 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -1426,6 +1426,7 @@ static int
virPCIDeviceBindToStub(virPCIDevice *dev)
{
g_autofree char *stubDriverPath = NULL;
+ g_autofree char *autodetectModuleName = NULL;
g_autofree char *driverLink = NULL;
@@ -1436,6 +1437,20 @@ virPCIDeviceBindToStub(virPCIDevice *dev)
return -1;
}
+ if (dev->stubDriverType == VIR_PCI_STUB_DRIVER_VFIO
+ && !dev->stubDriverName) {
+ /* automatically use a VFIO variant driver if available for
+ * this device.
+ */
+
+ if (virPCIDeviceFindBestVFIOVariant(dev, &autodetectModuleName) < 0)
+ return -1;
+
+ g_free(dev->stubDriverName);
+ dev->stubDriverName = g_steal_pointer(&autodetectModuleName);
+ }
+
+ /* if a driver name hasn't been decided by now, use default for this type */
if (!dev->stubDriverName) {
const char *stubDriverName = NULL;
--
2.41.0