From 1439eb32afc9f97378d1d121c0b5c80d2f84896c Mon Sep 17 00:00:00 2001
From: Luyao Huang <lhuang@redhat.com>
Date: Mon, 20 Jul 2015 17:18:37 +0800
Subject: [PATCH] qemu: fix some api cannot work when disable cpuset in conf

If cpuset is disabled or not available, it libvirt must not use it.
Mainly for actions that do not need it and can use sched_setaffinity()
or numa_membind() instead, because they will fail without good reason.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1244664

Signed-off-by: Luyao Huang <lhuang@redhat.com>
---
 src/qemu/qemu_cgroup.c | 16 ++++++++--------
 src/qemu/qemu_driver.c | 10 +++++++---
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index ab21e12709..e1a28272ee 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -1025,10 +1025,6 @@ qemuSetupCgroupForVcpu(virDomainObjPtr vm)
         if (virCgroupAddTask(cgroup_vcpu, priv->vcpupids[i]) < 0)
             goto cleanup;
 
-        if (mem_mask &&
-            virCgroupSetCpusetMems(cgroup_vcpu, mem_mask) < 0)
-            goto cleanup;
-
         if (period || quota) {
             if (qemuSetupCgroupVcpuBW(cgroup_vcpu, period, quota) < 0)
                 goto cleanup;
@@ -1038,6 +1034,10 @@ qemuSetupCgroupForVcpu(virDomainObjPtr vm)
         if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
             virBitmapPtr cpumap = NULL;
 
+            if (mem_mask &&
+                virCgroupSetCpusetMems(cgroup_vcpu, mem_mask) < 0)
+                goto cleanup;
+
             /* try to use the default cpu maps */
             if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
                 cpumap = priv->autoCpuset;
@@ -1202,15 +1202,15 @@ qemuSetupCgroupForIOThreads(virDomainObjPtr vm)
                 goto cleanup;
         }
 
-        if (mem_mask &&
-            virCgroupSetCpusetMems(cgroup_iothread, mem_mask) < 0)
-            goto cleanup;
-
         /* Set iothreadpin in cgroup if iothreadpin xml is provided */
         if (virCgroupHasController(priv->cgroup,
                                    VIR_CGROUP_CONTROLLER_CPUSET)) {
             virBitmapPtr cpumask = NULL;
 
+            if (mem_mask &&
+                virCgroupSetCpusetMems(cgroup_iothread, mem_mask) < 0)
+                goto cleanup;
+
             if (def->iothreadids[i]->cpumask)
                 cpumask = def->iothreadids[i]->cpumask;
             else if (def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index b9278f87ac..7a984a86ab 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4597,7 +4597,9 @@ qemuDomainAddCgroupForThread(virCgroupPtr cgroup,
     if (virCgroupNewThread(cgroup, nameval, idx, true, &new_cgroup) < 0)
         return NULL;
 
-    if (mem_mask && virCgroupSetCpusetMems(new_cgroup, mem_mask) < 0)
+    if (mem_mask &&
+        virCgroupHasController(cgroup, VIR_CGROUP_CONTROLLER_CPUSET) &&
+        virCgroupSetCpusetMems(new_cgroup, mem_mask) < 0)
         goto error;
 
     /* Add pid/thread to the cgroup */
@@ -4653,7 +4655,8 @@ qemuDomainHotplugPinThread(virBitmapPtr cpumask,
 {
     int ret = -1;
 
-    if (cgroup) {
+    if (cgroup &&
+        virCgroupHasController(cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
         if (qemuSetupCgroupCpusetCpus(cgroup, cpumask) < 0) {
             virReportError(VIR_ERR_OPERATION_INVALID,
                            _("failed to set cpuset.cpus in cgroup for id %d"),
@@ -4896,7 +4899,8 @@ qemuDomainSetVcpusFlags(virDomainPtr dom, unsigned int nvcpus,
     if (virDomainObjGetDefs(vm, flags, &def, &persistentDef) < 0)
         goto endjob;
 
-    if (def && !(flags & VIR_DOMAIN_VCPU_GUEST) && virNumaIsAvailable()) {
+    if (def && !(flags & VIR_DOMAIN_VCPU_GUEST) && virNumaIsAvailable() &&
+        virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
         if (virCgroupNewThread(priv->cgroup, VIR_CGROUP_THREAD_EMULATOR, 0,
                                false, &cgroup_temp) < 0)
             goto endjob;