[Xen-changelog] [xen-unstable] xentrace: restrict trace buffer MFNs

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1277738876 -3600
# Node ID 7e46fdbe8a1187cee2ab609256300d7967f37f06
# Parent  bf64e1081333696c68c9430cbc32c8bd6ee18796
xentrace: restrict trace buffer MFNs

Since they're being passed to Dom0 using an array of uint32_t, they
must be representable as 32-bit quantities, and hence the buffer
allocation must specify an upper address boundary.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
 xen/common/trace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r bf64e1081333 -r 7e46fdbe8a11 xen/common/trace.c
--- a/xen/common/trace.c        Fri Jun 25 16:05:20 2010 +0100
+++ b/xen/common/trace.c        Mon Jun 28 16:27:56 2010 +0100
@@ -130,7 +130,8 @@ static int alloc_trace_bufs(void)
         char         *rawbuf;
         struct t_buf *buf;
 
-        if ( (rawbuf = alloc_xenheap_pages(order, 0)) == NULL )
+        if ( (rawbuf = alloc_xenheap_pages(
+                order, MEMF_bits(32 + PAGE_SHIFT))) == NULL )
         {
             printk("Xen trace buffers: memory allocation failed\n");
             opt_tbuf_size = 0;

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