From c9c71e4124b00d33d89aa95527b32527cee5198f Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Wed, 17 Jan 2018 09:20:05 +0000 Subject: [PATCH] xen/pvshim: identity pin shim vCPUs to pCPUs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Wei Liu Acked-by: Jan Beulich --- 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 { -- 2.30.2