Re: [Xen-devel] [PATCH 08/18] PVH xen: tools changes to create PVH domain

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Thu, 29 Aug 2013 10:01:25 +0100
Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

> On Wed, 2013-08-28 at 18:51 -0700, Mukesh Rathor wrote:
> > On Thu, 1 Aug 2013 09:01:31 +0100
> > Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > 
> > > On Wed, 2013-07-31 at 19:02 -0700, Mukesh Rathor wrote:
> > > > On Wed, 31 Jul 2013 13:00:57 +0100
> > > > Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
...
> > Hmm.. the problem I am running here now is setting of PVH flag in 
> > xch->flags from libxl? struct xch seems to be private to libxc.
> 
> xch is the libxc handle used by all the api calls, so it can't be
> private to libxc. There is an xch inside the libxl ctx, use either
> ctx->xch or CTX->xch depending on whether you have a ctx or a gc in
> the function in question.
> 
> Actually, xch->flags & PVH is not the right place. xch is a handle
> onto an open libxc instance, it is not per-domain, so adding PVH to
> xch->flags is wrong. Not sure how I missed that initially.
> 
> I think you need to add the flag to the dom->flags in
> libxl__build_pv. I don't think anything before the existing setting
> of that field needs to know if the guest is PVH or not. The calls
> between xc_dom_allocate and there are
> xc_dom_(kernel|ramdisk)_(file|mem) which are just setting up internal
> state and not touching the guest yet. If I'm wrong about that then I
> think the block setting all of those dom->fields can be moved up.

The problem is I need to tell xc_dom_allocate() it's a PVH guest somehow 
so it can call elf_xen_parse_features for PVH also. Since,
thats not feasible, I can set the pvh flag in libxl__build_pv, and 
xc_dom_parse_image() can then parse PVH features by calling
elf_xen_parse_features(). LMK if thats not OK.

thanks
Mukesh


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