Re: [libvirt] [PATCH 4/8] Wait for vfio-pci device cleanups before reassinging the device to host driver

Before unbind from stub driver libvirt should be sure the guest is not using the device anymore. The libvirt today waits for pci-stub driver alone in /proc/iommu. The same wait is needed for vfio devices too. Signed-off-by: Shivaprasad G Bhat <sbhat(a)linux.vnet.ibm.com&gt; --- src/util/virhostdev.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/util/virhostdev.c b/src/util/virhostdev.c index 91f28e9..6247477 100644 --- a/src/util/virhostdev.c +++ b/src/util/virhostdev.c @@ -756,6 +756,13 @@ virHostdevReattachPCIDevice(virPCIDevicePtr dev, virHostdevManagerPtr mgr) usleep(100*1000); retries--; } + } else if (STREQ(virPCIDeviceGetStubDriver(dev), "vfio-pci")) { + int retries = 100; + while (virPCIDeviceWaitForCleanup(dev, "vfio-pci") + && retries) { + usleep(100*1000); + retries--; + } } if (virPCIDeviceReattach(dev, mgr->activePCIHostdevs,