[Xen-devel] Guidance for PVHv2 usage?

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

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?)


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel