[PATCH v2 1/2] xen: sched: dom0_vcpus_pin should only affect dom0

[Dario Faggioli <dfaggioli@xxxxxxxx>]

If dom0_vcpus_pin is used, make sure the pinning is only done for
dom0 vcpus, instead of for the hardware domain (which might not be
dom0 at all!).

Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
---
Changes from v1:
- check domain_id to be 0, for properly identifying dom0

Difference from "RFC" [1]:
- new patch

[1] 
https://lore.kernel.org/xen-devel/e061a647cd77a36834e2085a96a07caa785c5066.camel@xxxxxxxx/
---
 xen/common/sched/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c
index f689b55783..a066c629cb 100644
--- a/xen/common/sched/core.c
+++ b/xen/common/sched/core.c
@@ -575,7 +575,7 @@ int sched_init_vcpu(struct vcpu *v)
      * Initialize affinity settings. The idler, and potentially
      * domain-0 VCPUs, are pinned onto their respective physical CPUs.
      */
-    if ( is_idle_domain(d) || (is_hardware_domain(d) && opt_dom0_vcpus_pin) )
+    if ( is_idle_domain(d) || (d->domain_id == 0 && opt_dom0_vcpus_pin) )
         sched_set_affinity(unit, cpumask_of(processor), &cpumask_all);
     else
         sched_set_affinity(unit, &cpumask_all, &cpumask_all);