--- wikisrc/ports/xen/howto.mdwn	2020/05/25 09:28:21	1.169
+++ wikisrc/ports/xen/howto.mdwn	2020/10/31 15:29:23	1.170
@@ -14,15 +14,20 @@ Xen supports different styles of guest:
 Style of guest	|Supported by NetBSD
 PV		|Yes (dom0, domU)
 HVM		|Yes (domU)
-PVHVM		|No
-PVH		|No
+PVHVM		|current-only (dom0, domU)
+PVH		|current-only (dom0, domU)
 """]]
 
 In Para-Virtualized (PV) mode, the guest OS does not attempt to access
 hardware directly, but instead makes hypercalls to the hypervisor; PV
-guests must be specifically coded for Xen. In HVM mode, no guest
-modification is required; however, hardware support is required, such
-as VT-x on Intel CPUs and SVM on AMD CPUs.
+guests must be specifically coded for Xen.
+
+In HVM mode, no guest modification is required; however, hardware
+support is required, such as VT-x on Intel CPUs and SVM on AMD CPUs.
+
+In PVHVM mode, the guest mostly runs as HVM, but can use PV drivers for efficiency.  See https://wiki.xen.org/wiki/PV_on_HVM
+
+In PVH mode, the guest uses PV interfaces for IO and native interfaces for everything else.   This is also called PVHv2; see https://wiki.xenproject.org/wiki/PVH_(v2)_Domu
 
 At boot, the dom0 kernel is loaded as a module with Xen as the kernel.
 The dom0 can start one or more domUs.  (Booting is explained in detail