[Xen-devel] [PATCH 3/6] xen/pvshim: identity pin shim vCPUs to pCPUs

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Since VCPUOP_{up/down} already identity pins vCPU hotplug to pCPU
hotplug also pin the vCPUs to the pCPUs in the scheduler. This prevent
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@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
Should be backported to the 4.10.0-shim-comet branch.
---
 xen/arch/x86/dom0_build.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index 17cb1272c1..555660b853 100644
--- 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
         {
-- 
2.15.1


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