KVM: PPC: Introduce KVM_CAP_PPC_HTM

sambltc · bonzini · commit 23528bb21ee2 · 2016-08-01T19:42:06.000+02:00
Introduce a new KVM capability, KVM_CAP_PPC_HTM, that can be queried to
determine if a PowerPC KVM guest should use HTM (Hardware Transactional
Memory).

This will be used by QEMU to populate the pa-features bits in the
guest's device tree.

Signed-off-by: Sam Bobroff &lt;sam.bobroff@au1.ibm.com&gt;
Reviewed-by: David Gibson &lt;david@gibson.dropbear.id.au&gt;
Signed-off-by: Paolo Bonzini &lt;pbonzini@redhat.com&gt;
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
@@ -588,6 +588,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = 1;
 		break;
 #endif
+	case KVM_CAP_PPC_HTM:
+		r = cpu_has_feature(CPU_FTR_TM_COMP) &&
+		    is_kvmppc_hv_enabled(kvm);
+		break;
 	default:
 		r = 0;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
@@ -869,6 +869,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_X2APIC_API 129
 #define KVM_CAP_S390_USER_INSTR0 130
 #define KVM_CAP_MSI_DEVID 131
+#define KVM_CAP_PPC_HTM 132
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
