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 <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index 17cb1272c1cded1f011e5cfa8e1376828cac3a20..555660b85333e866d7657fd6d287c2fd240b7802 100644 (file)
--- 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
         {