Re: [Xen-devel] [PATCH] xen: make (set|get)_xen_guest_handle available

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On Thursday 30 July 2009 14:41:33 Boris Derzhavets wrote:
> Hi Christoph,
>
> > NetBSD 5.0 got Xen 3.x support (both 32bit and 64bit), kept Xen 2 support
>
> Sounds a bit strange for me. Like only 3.X  Xen Hypervisor could be
> connected via hypercalls from NetBSD 5.0 DomU xenified kernel. ( For
> instance Solaris Nevada until build 84(5)  ( or so)  required patch to work
> with Xen 3.2 and higher Linux Dom0 )

Patches for NetBSD are maintained in NetBSD's package management (likewise
Gentoo or Debian have their own patches in their packages).
Most of them break non-NetBSD totally, that's why I can't just submit them at 
once. xen-unstable is in a very good shape though. patch queue is very small 
now.

> Would NetBSD 5.0 understand Xen 3.4.1 Dom0 on top
> of Ubuntu 9.04 or F11 (64-bit environment) ?

Yes.

>
> Thanks.
> Boris.
>
> --- On Thu, 7/30/09, Christoph Egger <Christoph.Egger@xxxxxxx> wrote:
>
> From: Christoph Egger <Christoph.Egger@xxxxxxx>
> Subject: Re: [Xen-devel] [PATCH] xen: make (set|get)_xen_guest_handle
> available To: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
> Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir
> Fraser" <keir.fraser@xxxxxxxxxxxxx> Date: Thursday, July 30, 2009, 7:55 AM
>
>
> Hi Boris,
>
> this is the history:
>
> NetBSD 2.0 got Xen 1.2 support (both Dom0 and DomU)
> NetBSD 3.0 got Xen 2 support, dropped Xen 1.2 support (both Dom0 and DomU)
> NetBSD 4.0 got Xen 3.0/3.1 support 32bit only, kept Xen 2 support (both
> Dom0 and DomU)
> NetBSD 5.0 got Xen 3.x support (both 32bit and 64bit), kept Xen 2 support
> (both Dom0 and DomU)
> NetBSD-current dropped Xen 2 support, about to move to new interface.
>
> Christoph
>
> On Thursday 30 July 2009 13:16:00 Boris Derzhavets wrote:
> > May the recent version of NetBSD run as PV guest ?
> > Sorry, for stupid question.
> > Boris.
> >
> > --- On Thu, 7/30/09, Christoph Egger <Christoph.Egger@xxxxxxx> wrote:
> >
> > From: Christoph Egger <Christoph.Egger@xxxxxxx>
> > Subject: Re: [Xen-devel] [PATCH] xen: make (set|get)_xen_guest_handle
> > available To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
> > Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
> > Date: Thursday, July 30, 2009, 6:34 AM
> >
> > On Thursday 30 July 2009 12:14:04 Keir Fraser wrote:
> > > On 30/07/2009 10:12, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:
> > > > Make (set|get)_xen_guest_handle() always available.
> > > > This avoids code snippets in the guest like this:
> > > >
> > > > #if __XEN_ITNERFACE_VERSION__ >= 0x00030201
> > > > set_xen_guest_handle(hnd, val);
> > > > #else
> > > > hnd = val;
> > > > #endif
> > >
> > > Actually I don't see why you'd have code like this. *You*, the guest,
> > > gets to specify __XEN_INTERFACE_VERSION__ -- that is the point of it --
> > > so ifdef'ing based on it in the guest is stupid.
> > >
> > > Just specify __XEN_INTERFACE_VERSION__ to be recent enough to have the
> > > guest handles, and then remove your ifdefs. Simple.
> >
> > The point is to keep backward compatibility. The patch makes Xen more
> > friendly with using the old non-structured guest handler if the user
> > wants.
> >
> > NetBSD offers both way to build & run it with either using the old or new
> > interface. This allows a smooth migration.
> >
> > Christoph



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