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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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)
-boris




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