diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 268e31c7e49c..3de8a1f89a7d 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -803,7 +803,10 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
 		vcpu->arch.dawrx1 = value2;
 		return H_SUCCESS;
 	case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
-		/* KVM does not support mflags=2 (AIL=2) */
+		/*
+		 * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved.
+		 * Keep this in synch with kvmppc_filter_guest_lpcr_hv.
+		 */
 		if (mflags != 0 && mflags != 3)
 			return H_UNSUPPORTED_FLAG_START;
 		return H_TOO_HARD;
@@ -1645,6 +1648,8 @@ unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr)
 	/* On POWER8 and above, userspace can modify AIL */
 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 		lpcr &= ~LPCR_AIL;
+	if ((lpcr & LPCR_AIL) != LPCR_AIL_3)
+		lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */
 
 	/*
 	 * On POWER9, allow userspace to enable large decrementer for the