[PATCH RESEND 15/20] qemu_cgroup.c: skip absent PCI devices in qemuTeardownHostdevCgroup()

[Daniel Henrique Barboza <danielhb413@xxxxxxxxx>]

There is no need to bother with cgroup tearing down for absent
PCI devices, given that their entries in the sysfs are already
gone.

Signed-off-by: Daniel Henrique Barboza <danielhb413@xxxxxxxxx>
---
 src/qemu/qemu_cgroup.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index f7146a71c9..050df21d87 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -467,6 +467,16 @@ qemuTeardownHostdevCgroup(virDomainObjPtr vm,
     if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
         return 0;
 
+    /* Skip tearing down Cgroup for hostdevs that represents absent
+     * PCI devices, e.g. SR-IOV virtual functions that were removed from
+     * the host while the domain was still running. */
+    if (virHostdevIsPCIDevice(dev)) {
+        const virDomainHostdevSubsysPCI *pcisrc = &dev->source.subsys.u.pci;
+
+        if (!virPCIDeviceExists(&pcisrc->addr))
+            return 0;
+    }
+
     if (qemuDomainGetHostdevPath(dev, &path, NULL) < 0)
         return -1;
 
-- 
2.26.2