Re: [Xen-devel] [PATCH v5 8/9] libxc: rework of domain builder's page table handler

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Nov 18, 2015 at 11:11:16AM -0500, Boris Ostrovsky wrote:
> On 11/12/2015 08:43 AM, Juergen Gross wrote:
> >In order to prepare a p2m list outside of the initial kernel mapping
> >do a rework of the domain builder's page table handler. The goal is
> >to be able to use common helpers for page table allocation and setup
> >for initial kernel page tables and page tables mapping the p2m list.
> >This is achieved by supporting multiple mapping areas. The mapped
> >virtual addresses of the single areas must not overlap, while the
> >page tables of a new area added might already be partially present.
> >Especially the top level page table is existing only once, of course.
> >
> >Currently restrict the number of mappings to 1 because the only mapping
> >now is the initial mapping created by toolstack. There should not be
> >behaviour change and guest visible change introduced.
> >
> >Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> >Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx
> >---
> >  tools/libxc/xc_dom_x86.c | 479 
> > ++++++++++++++++++++++++-----------------------
> >  tools/libxc/xg_private.h |  39 +---
> >  2 files changed, 252 insertions(+), 266 deletions(-)
> 
> This broke PVH. I get a triple fault (somewhere in clear_page(), so the
> guest have run a little)
> 

Is there any output? We just noticed 32 bit pvgrub is broken. Not sure
these two problems are related but the more information the better.

Wei.

> -boris
> 
> 
> 

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