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From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: elena.ufimtseva@oracle.com, wei.liu2@citrix.com,
	Ian Campbell <ian.campbell@citrix.com>,
	andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com,
	xen-devel@lists.xenproject.org, boris.ostrovsky@oracle.com
Subject: Re: [PATCH RFC v1 00/13] Introduce HMV without dm and new boot ABI
Date: Tue, 23 Jun 2015 09:14:00 +0200	[thread overview]
Message-ID: <55890738.3060106@citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1506221851040.4824@kaball.uk.xensource.com>

Hello,

El 22/06/15 a les 19.55, Stefano Stabellini ha escrit:
> Hi Roger,
> 
> given that this patch series is actually using the Xen "hvm" builder, I
> take that all the PVH code paths in Xen or the guest kernel are not
> actually used, correct? This is more like PV on HVM without QEMU, right?

>From a Xen POV this is not a PVH guest (it's an HVM guest), although I'm
using some code paths which are shared with PVH. In the guest (in this
case FreeBSD) I'm using the same paths as PVH, since the exposed
interface is very similar. We probably aim at enabling the same set of
hypercalls that are enabled on PVH.

> Do you think think this can work for Dom0 too?

I don't see why it couldn't be made to work.

> Would that make all the PVH stuff in Xen and Linux effectively useless?

No, I expect that some code paths inside of Xen will be shared between
PVH and this HVM-without-dm guest type.

Then from a guest POV the interface is quite similar, so most of the
code present in Linux and FreeBSD in order to run as a PVH guest can be
reused for this new guest mode. If you take a look at the FreeBSD patch
the change is just mostly during early boot in order to set the page
tables and jump into long mode, then the rest is quite similar to PVH.

Forgot to mention, I've also tested it with hap=0 (so using shadow) and
it seems to work fine.

Roger.

      parent reply	other threads:[~2015-06-23  7:14 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-22 16:11 [PATCH RFC v1 00/13] Introduce HMV without dm and new boot ABI Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 01/13] libxc: split x86 HVM setup_guest into smaller logical functions Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 02/13] libxc: unify xc_dom_p2m_{host/guest} Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 03/13] libxc: introduce the notion of a container type Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 04/13] libxc: allow arch_setup_meminit to populate HVM domain memory Roger Pau Monne
2015-06-25 10:29   ` Wei Liu
2015-06-25 10:33     ` Wei Liu
2015-06-22 16:11 ` [PATCH RFC v1 05/13] libxc: introduce a domain loader for HVM guest firmware Roger Pau Monne
2015-06-23  9:29   ` Jan Beulich
2015-06-23  9:36     ` Roger Pau Monné
2015-07-10 19:09   ` Konrad Rzeszutek Wilk
2015-06-22 16:11 ` [PATCH RFC v1 06/13] libxc: introduce a xc_dom_arch for hvm-3.0-x86_32 guests Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 07/13] libxl: switch HVM domain building to use xc_dom_* helpers Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 08/13] libxc: remove dead x86 HVM code Roger Pau Monne
2015-06-22 16:11 ` [PATCH RFC v1 09/13] elfnotes: intorduce a new PHYS_ENTRY elfnote Roger Pau Monne
2015-06-23  9:35   ` Jan Beulich
2015-06-23  9:40     ` Roger Pau Monné
2015-06-23 10:01       ` Jan Beulich
2015-06-22 16:11 ` [PATCH RFC v1 10/13] lib{xc/xl}: allow the creation of HVM domains with a kernel Roger Pau Monne
2015-06-25 10:39   ` Wei Liu
2015-06-22 16:11 ` [PATCH RFC v1 11/13] xen/libxl: allow creating HVM guests without a device model Roger Pau Monne
2015-06-23  9:41   ` Jan Beulich
2015-06-22 16:11 ` [PATCH RFC v1 12/13] xen: allow 64bit HVM guests to use XENMEM_memory_map Roger Pau Monne
2015-06-23  9:43   ` Jan Beulich
2015-06-22 16:11 ` [PATCH RFC v1 13/13] xenconsole: try to attach to PV console if HVM fails Roger Pau Monne
2015-06-22 17:55 ` [PATCH RFC v1 00/13] Introduce HMV without dm and new boot ABI Stefano Stabellini
2015-06-22 18:05   ` Konrad Rzeszutek Wilk
2015-06-23  8:14     ` Roger Pau Monné
2015-06-23 10:55     ` Stefano Stabellini
2015-06-23 12:50       ` Ian Campbell
2015-06-23 13:12         ` Stefano Stabellini
2015-06-24  2:45           ` Boris Ostrovsky
2015-06-24  9:47       ` Roger Pau Monné
2015-06-24 10:05         ` Jan Beulich
2015-06-24 10:14           ` Roger Pau Monné
2015-06-24 11:52             ` Boris Ostrovsky
2015-06-24 12:04               ` Roger Pau Monné
2015-06-24 13:36                 ` Konrad Rzeszutek Wilk
2015-07-03 16:22               ` Tim Deegan
2015-06-24 13:26         ` Stefano Stabellini
2015-06-24 16:30           ` Boris Ostrovsky
2015-06-24 17:54             ` Stefano Stabellini
2015-06-23  7:14   ` Roger Pau Monné [this message]

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