xen/pvshim: identity pin shim vCPUs to pCPUs

Since VCPUOP_{up/down} already identity maps vCPU hotplug to pCPU hotplug also identity pin the vCPUs to the pCPUs in the scheduler. This prevents vCPU migration and should improve performance. While there also use __cpumask_set_cpu instead of cpumask_set_cpu, there's no need to use the locked variant. Signed-off-by: Roger Pau Monné <[email protected]> Reviewed-by: Wei Liu <[email protected]> Acked-by: Jan Beulich <[email protected]>
microslicedcore · Jan 18, 2018 · c9c71e4 · c9c71e4
1 parent a232346
commit c9c71e4
Showing 1 changed file with 2 additions and 3 deletions.
diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
@@ -140,9 +140,8 @@ struct vcpu *__init dom0_setup_vcpu(struct domain *d,
     {
         if ( pv_shim )
         {
-
-            cpumask_setall(v->cpu_hard_affinity);
-            cpumask_setall(v->cpu_soft_affinity);
+            __cpumask_set_cpu(vcpu_id, v->cpu_hard_affinity);
+            __cpumask_set_cpu(vcpu_id, v->cpu_soft_affinity);
         }
         else
         {