KVM: extend EMULATE_EXIT_USER to support different exit reasons

Currently the instruction emulator code returns EMULATE_EXIT_USER
and common code initializes the "run->exit_reason = .." and
"vcpu->arch.hcall_needed = .." with one fixed reason.
But there can be different reasons when emulator need to exit
to user space. To support that the "run->exit_reason = .."
and "vcpu->arch.hcall_needed = .." initialization is moved a
level up to emulator.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/kvm/book3s_emulate.c

@@ -194,6 +194,8 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
 				run->papr_hcall.args[i] = gpr;
 			}
 
+			run->exit_reason = KVM_EXIT_PAPR_HCALL;
+			vcpu->arch.hcall_needed = 1;
 			emulated = EMULATE_EXIT_USER;
 			break;
 		}

arch/powerpc/kvm/book3s_pr.c

@@ -763,8 +763,6 @@ program_interrupt:
 			r = RESUME_HOST_NV;
 			break;
 		case EMULATE_EXIT_USER:
-			run->exit_reason = KVM_EXIT_PAPR_HCALL;
-			vcpu->arch.hcall_needed = 1;
 			r = RESUME_HOST_NV;
 			break;
 		default: