--- 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