qemu: Adjust max memlock on mdev hotplug

When starting a domain, we use the presence of a vfio-pci or
mdev hostdev to determine if the memlock maximum needs to be
increased.  But if we hotplug either of these devices, only the
vfio-pci path gets that love.  This means that attaching a, say,
vfio-ccw device will appear to succeed but the device may be
unusable as the guest may see I/O errors on long CCW chains.
The host, meanwhile, would be flooded with these messages:

  vfio_pin_page_external: Task qemu-system-s39 (11584) RLIMIT_MEMLOCK (65536) exceeded

Let's adjust the maximum memlock value in the mdev hotplug path,
so that the domain has the same value as if it were started with
one or more mdev devices in its configuration.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index a63f1c7af45ca7828b2106c5580e3dfa438957c2..bd8868b0f76c6d6b772eeb34253540d9f750a8b0 100644 (file)
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -2868,6 +2868,7 @@ qemuDomainAttachMediatedDevice(virQEMUDriverPtr driver,
     bool teardowncgroup = false;
     bool teardownlabel = false;
     bool teardowndevice = false;
+    bool teardownmemlock = false;
     qemuDomainObjPrivatePtr priv = vm->privateData;
     virDomainDeviceDef dev = { VIR_DOMAIN_DEVICE_HOSTDEV,
                                 { .hostdev = hostdev } };
@@ -2911,6 +2912,10 @@ qemuDomainAttachMediatedDevice(virQEMUDriverPtr driver,
     if (VIR_REALLOC_N(vm->def->hostdevs, vm->def->nhostdevs + 1) < 0)
         goto cleanup;
 
+    if (qemuDomainAdjustMaxMemLockHostdev(vm, hostdev) < 0)
+        goto cleanup;
+    teardownmemlock = true;
+
     qemuDomainObjEnterMonitor(driver, vm);
     ret = qemuMonitorAddDevice(priv->mon, devstr);
     if (qemuDomainObjExitMonitor(driver, vm) < 0) {
@@ -2926,6 +2931,8 @@ qemuDomainAttachMediatedDevice(virQEMUDriverPtr driver,
     ret = 0;
  cleanup:
     if (ret < 0) {
+        if (teardownmemlock && qemuDomainAdjustMaxMemLock(vm) < 0)
+            VIR_WARN("Unable to reset maximum locked memory on hotplug fail");
         if (teardowncgroup && qemuTeardownHostdevCgroup(vm, hostdev) < 0)
             VIR_WARN("Unable to remove host device cgroup ACL on hotplug fail");
         if (teardownlabel &&