From: Olaf Hering <olaf@aepfle.de>
Date: Mon, 20 Feb 2012 16:11:38 +0000 (+0000)
Subject: xenpaging: mmap guest pages read-only
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=20529ff6c6f75e6a3f5dc5e3e0345d30e797a56a;p=xen.git

xenpaging: mmap guest pages read-only

xenpaging does not write to the gfn, so map the gfn to page-out in
read-only mode.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
---

diff --git a/tools/xenpaging/xenpaging.c b/tools/xenpaging/xenpaging.c
index 2e8c10d143..6f18376b4b 100644
--- a/tools/xenpaging/xenpaging.c
+++ b/tools/xenpaging/xenpaging.c
@@ -574,7 +574,7 @@ static int xenpaging_evict_page(struct xenpaging *paging, struct victim *victim,
     gfn = victim->gfn;
     ret = -EFAULT;
     page = xc_map_foreign_pages(xch, paging->mem_event.domain_id,
-                                PROT_READ | PROT_WRITE, &gfn, 1);
+                                PROT_READ, &gfn, 1);
     if ( page == NULL )
     {
         PERROR("Error mapping page %lx", victim->gfn);