Re: [Xen-ia64-devel] [Patch] Fix for re-enabling PV-on-HVM on IPF

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Wed, Mar 07, 2007 at 08:55:19AM +0900, Doi.Tsunehisa@xxxxxxxxxxxxxx wrote:
>   I've thought that this patch is tricky, but I didn't find the
> correct way to modify to avoid hypervisor crash issue.

Wrong patch is worse than crash.


>   Currently, without this patch, hypervisor crashes in PV-on-HVM
> initialization phase..
> 
>   * at share_info page remapping: success
>     - called from HYPERVISOR_memory_op in init_xen_info()..
>       (unmodified_drivers/linux-2.6/platform-pci/platform-pci.c)
>   * at grant table page remapping: crash
>     - called from gnttab_init() in init_xen_info()
>     - call tree in driver code is 
>       gnttab_init() -> gnttab_resume() -> gnttab_map()
>          -> HYPERVISOR_memory_op
>       (linux-2.6-xen-sparse/drivers/xen/core/gnttab.c)
>     - at guest_physmap_add_page() in hypervisor code,


The grant table shared pages are owned by the domain
so that get_page() shouldn't fail.

Why get_page() fails?
The c/s 14010:01476c7804b2 of xen-ia64-unstable.hg twists
the grant table initialization a little.
Does it affect on vt-i domain initialization?
-- 
yamahata

_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel