Xen devel - Jul 2008 - [PATCH] Fix issue with user-mode writes to ro memory

This patch fixes an issue where a guest could get stuck if a write to memory
marked p2m_ram_ro happened from user mode. It would get misinterpreted as a
user-mode page-table write, and the "dummy write" emulation necessary
to
skip over the instruction never got done.
In looking into this, I also discovered that the user-mode page-table check
is done in two places, the second (in emulate_map_dest) of which can never
be reached and is just a waste of cycles. Tim Deegan requested that rather
than completely removing that code, I''d leave it in for debug-builds
with an
added warning-print.

Signed-off-by: Trolle Selander <trolle.selander@eu.citrix.com
<mailto:trolle.selander@eu.citrix.com>
<trolle.selander@eu.citrix.com>



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