[Xen-changelog] [xen stable-4.10] xen/pvshim: identity pin shim vCPUs to pCPUs

[patchbot@xxxxxxx]

commit f05a7c5148923fd478083bbf375e6c79bc08ec32
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Jan 17 09:20:05 2018 +0000
Commit:     Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Mon Mar 5 15:49:41 2018 +0000

    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@xxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    (cherry picked from commit c9c71e4124b00d33d89aa95527b32527cee5198f)
---
 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 b4f4a4ac4a..9886d60557 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
         {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.10

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