arm/arm64: KVM: Fix PSCI affinity info return value for non valid cores

If a guest requests the affinity info for a non-existing vCPU we need to
properly return an error, instead of erroneously reporting an off state.

Signed-off-by: Alexander Spyridakis <a.spyridakis@virtualopensystems.com>
Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 4b94b51..ad6f642 100644 (file)
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -126,7 +126,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
 
 static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
 {
-       int i;
+       int i, matching_cpus = 0;
        unsigned long mpidr;
        unsigned long target_affinity;
        unsigned long target_affinity_mask;
@@ -151,12 +151,16 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
         */
        kvm_for_each_vcpu(i, tmp, kvm) {
                mpidr = kvm_vcpu_get_mpidr_aff(tmp);
-               if (((mpidr & target_affinity_mask) == target_affinity) &&
-                   !tmp->arch.pause) {
-                       return PSCI_0_2_AFFINITY_LEVEL_ON;
+               if ((mpidr & target_affinity_mask) == target_affinity) {
+                       matching_cpus++;
+                       if (!tmp->arch.pause)
+                               return PSCI_0_2_AFFINITY_LEVEL_ON;
                }
        }
 
+       if (!matching_cpus)
+               return PSCI_RET_INVALID_PARAMS;
+
        return PSCI_0_2_AFFINITY_LEVEL_OFF;
 }