Guidance for PVHv2 usage?

[PGNet Dev <pgnet.dev@gmail.com>]

Starting with

	Xen Changes For Linux 4.11: Lands PVHv2 Guest Support
	https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.11-Xen-Changes

	[GIT PULL] xen: features and fixes for 4.11-rc0
	http://lkml.iu.edu/hypermail/linux/kernel/1702.2/03209.html

IIUC, Xen 4.9 + kernel-default > v4.11 should now fully support PVHv2?

I'm running Xen 4.9.0 host on kernel 4.11.3

	dmesg | egrep -i "linux version|xen version"
		[    0.000000] Linux version 4.11.3-2.g7262353-default (geeko@buildhost) (gcc version 7.1.1 20170517 [gcc-7-branch revision 248152] (SUSE Linux) ) #1 SMP PREEMPT Thu May 25 17:55:04 UTC 2017 (7262353)
		[    0.000000] Xen version: 4.9.0_07-503 (preserve-AD)

, both installed from pkgs built for an Opensuse Leap 42.2 env.

The docs @

	https://xenbits.xen.org/docs/unstable/misc/hvmlite.html
	https://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html#Support-for-Paravirtualisation-of-HVM-Guests

are not clear on usage.

This

	https://xenbits.xen.org/docs/unstable/misc/pvh.html

suggests that for

	PVH 
		...
		ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz, "generic")
		...

the .cfg spec'n should be

	builder='generic'

but, there's no mention of which value for specific PVHv2 usage.

Poking around, I've found discussion that PVH may be eventually retired, and replaced with PVHv2, with same usage.

Is that the case already?  Or is there a transition state in effect, where both are available?

Atm, I do have a 'converted' HVM guest booting into _some- form of PVH for testing.

My current setup -- cobbled together from old PVH notes and some older posts, contains, in Grub

	GRUB_CMDLINE_XEN="dom0=hvm dom0_mem=4G,max:4G dom0_max_vcpus=4 ..."
	                  ^^^^^^^^

and in Guest.cfg

	builder = 'linux'
	kernel = '/usr/lib/grub2/x86_64-xen/grub.xen'
	xen_platform_pci = 1
	device_model_version = 'qemu-xen'
	...

With that^, the guest *IS* up & , as far as I've tested, functional.

At current host & guest loglevels, I've not yet seen any errors  -- I'm just not yet clear whether it's successfully, or completely & correctly, PVHv2 ...

Bottom line -- 

What *IS* the config/usage for PVHv2?  (Any current docs available?)


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