[Xen-devel] [PATCH 2/4] xen/arm: read ACTLR on the pcpu where the vcpu will run

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On big.LITTLE systems not all cores have the same ACTLR. Instead of
reading ACTLR and setting v->arch.actlr in vcpu_initialise, which is run
always on pcpu 0, do it later on the same pcpu where the vcpu will run.

This way, assuming that the vcpu has been created with the right pcpu
affinity, the guest will be able to read the right ACTLR value, matching
the one of the physical cpu.

Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/domain.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index a010443..532e824 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -314,6 +314,8 @@ static void schedule_tail(struct vcpu *prev)
 
 static void continue_new_vcpu(struct vcpu *prev)
 {
+    current->arch.actlr = READ_SYSREG32(ACTLR_EL1);
+
     schedule_tail(prev);
 
     if ( is_idle_vcpu(current) )
@@ -540,8 +542,6 @@ int vcpu_initialise(struct vcpu *v)
 
     v->arch.vmpidr = MPIDR_SMP | vcpuid_to_vaffinity(v->vcpu_id);
 
-    v->arch.actlr = READ_SYSREG32(ACTLR_EL1);
-
     v->arch.hcr_el2 = get_default_hcr_flags();
 
     processor_vcpu_initialise(v);
-- 
1.9.1


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