[Xen-changelog] [xen-unstable] libxc: correct dirty_bitmap bounce size in xc_hvm_track_dirty_vram

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

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1289400966 0
# Node ID 388c44a636137ebed114ed314a5c599e5a467f9d
# Parent  b0fe8260cefa87d0237278dd4c9fae7113b459ea
libxc: correct dirty_bitmap bounce size in xc_hvm_track_dirty_vram

The size should be in bytes not 32-bit words. Fixes graphics
corruption issues for HVM guests due to bouncing too little data.

Also the dirty_bitmap buffer is output only and therefore only needs
bouncing in one direction.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxc/xc_misc.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r b0fe8260cefa -r 388c44a63613 tools/libxc/xc_misc.c
--- a/tools/libxc/xc_misc.c     Wed Nov 10 14:37:19 2010 +0000
+++ b/tools/libxc/xc_misc.c     Wed Nov 10 14:56:06 2010 +0000
@@ -423,7 +423,7 @@ int xc_hvm_track_dirty_vram(
     unsigned long *dirty_bitmap)
 {
     DECLARE_HYPERCALL;
-    DECLARE_HYPERCALL_BOUNCE(dirty_bitmap, (nr+31) / 32, 
XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+    DECLARE_HYPERCALL_BOUNCE(dirty_bitmap, (nr+7) / 8, 
XC_HYPERCALL_BUFFER_BOUNCE_OUT);
     DECLARE_HYPERCALL_BUFFER(struct xen_hvm_track_dirty_vram, arg);
     int rc;
 

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