Re: [Xen-devel] [V6 PATCH 6/7] pvh dom0: Add and remove foreign pages

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 09 Dec 2013 02:45:19 +0000
Julien Grall <julien.grall@xxxxxxxxxx> wrote:

> 
> 
> On 12/06/2013 02:38 AM, Mukesh Rathor wrote:
> > In this patch, a new function, xenmem_add_foreign_to_p2m(), is added
> > to map pages from foreign guest into current dom0 for domU creation.
> > Such pages are typed p2m_map_foreign. Also, support is added here to
> > XENMEM_remove_from_physmap to remove such pages. Note, in the remove
> > path, we must release the refcount that was taken during the map
> > phase.
> >
> > Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> > ---
> >   xen/arch/x86/mm.c         |   88
> > +++++++++++++++++++++++++++++++++++++++++----
> > xen/common/memory.c       |   37 ++++++++++++++++++-
> > xen/include/asm-arm/p2m.h |    2 + 3 files changed, 118
> > insertions(+), 9 deletions(-)
> 
> This patch doesn't compile on ARM:
> memory.c: In function 'do_memory_op':
> memory.c:682:20: error: unused variable
> 'p2mt' [-Werror=unused-variable] cc1: all warnings being treated as
> errors
> 
> For x86, when a domain is destroyed and there is still some foreign
> page mapped, you forget to decrease the refcount (via put_page). It
> will likely result to a zombie domain.

right, i totally forgot. i think i can do that in p2m_remove_page.


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