1 files changed, 31 insertions, 0 deletions
diff --git a/main/qemu/qemu-vhost-fix-dirty-page-handling.patch b/main/qemu/qemu-vhost-fix-dirty-page-handling.patch
new file mode 100644
index 0000000000..e3fabb74aa
--- /dev/null
+++ b/main/qemu/qemu-vhost-fix-dirty-page-handling.patch
@@ -0,0 +1,31 @@
+vhost was passing a physical address to cpu_physical_memory_set_dirty,
+which is wrong: we need to translate to ram address first.
+
+Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
+
+Note: this lead to crashes during migration, so the patch
+is needed on the stable branch too.
+
+---
+ hw/vhost.c |    4 +++-
+ 1 files changed, 3 insertions(+), 1 deletions(-)
+
+diff --git a/hw/vhost.c b/hw/vhost.c
+index aaa34e4..97a1299 100644
+--- a/hw/vhost.c
++++ b/hw/vhost.c
+@@ -49,8 +49,10 @@ static void vhost_dev_sync_region(struct vhost_dev *dev,
+         log = __sync_fetch_and_and(from, 0);
+         while ((bit = sizeof(log) > sizeof(int) ?
+                 ffsll(log) : ffs(log))) {
++            ram_addr_t ram_addr;
+             bit -= 1;
+-            cpu_physical_memory_set_dirty(addr + bit * VHOST_LOG_PAGE);
++            ram_addr = cpu_get_physical_page_desc(addr + bit * VHOST_LOG_PAGE);
++            cpu_physical_memory_set_dirty(ram_addr);
+             log &= ~(0x1ull << bit);
+         }
+         addr += VHOST_LOG_CHUNK;
+-- 
+1.7.3.2.91.g446ac
+