diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index b68b342dd01f..f3158fb16de3 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -1370,6 +1370,12 @@ static int resize_hpt_rehash(struct kvm_resize_hpt *resize)
 	unsigned  long i;
 	int rc;
 
+	/*
+	 * resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs
+	 * that POWER9 uses, and could well hit a BUG_ON on POWER9.
+	 */
+	if (cpu_has_feature(CPU_FTR_ARCH_300))
+		return -EIO;
 	for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) {
 		rc = resize_hpt_rehash_hpte(resize, i);
 		if (rc != 0)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2b3e4e620078..fcb253ba51e5 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -613,7 +613,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = 1;
 		break;
 	case KVM_CAP_SPAPR_RESIZE_HPT:
-		r = !!hv_enabled;
+		/* Disable this on POWER9 until code handles new HPTE format */
+		r = !!hv_enabled && !cpu_has_feature(CPU_FTR_ARCH_300);
 		break;
 #endif
 	case KVM_CAP_PPC_HTM: