[PATCH 1/5] x86/mm: account for the offset when performing subpage r/o MMIO access

[Roger Pau Monne]

The current logic in subpage_mmio_write_emulate() doesn't take into account
the page offset, and always performs the writes at offset 0 (start of the
page).

Fix this by accounting for the offset before performing the write.

Fixes: 8847d6e23f97 ('x86/mm: add API for marking only part of a MMIO page read 
only')
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
 xen/arch/x86/mm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 4fecd37aeca0..1cf236516789 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -5131,6 +5131,7 @@ static void subpage_mmio_write_emulate(
         return;
     }
 
+    addr += offset;
     switch ( len )
     {
     case 1:
-- 
2.48.1