xen: only track the linear framebuffer

Xen can only do dirty bit tracking for one memory region, so we should
explicitly avoid trying to track anything but the vga vram region.

Signed-off-by: Stefano Stabellini <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>

diff --git a/xen-all.c b/xen-all.c
index 75a82c28fbb21e8ec10d8c3b33a95397269fcb0a..fe75ddd833696cf299c2f36e7076b571b637655e 100644 (file)
--- a/xen-all.c
+++ b/xen-all.c
@@ -215,6 +215,7 @@ static int xen_add_to_physmap(XenIOState *state,
     int rc = 0;
     XenPhysmap *physmap = NULL;
     target_phys_addr_t pfn, start_gpfn;
+    RAMBlock *block;
 
     if (get_physmapping(state, start_addr, size)) {
         return 0;
@@ -223,6 +224,19 @@ static int xen_add_to_physmap(XenIOState *state,
         return -1;
     }
 
+    /* Xen can only handle a single dirty log region for now and we want
+     * the linear framebuffer to be that region.
+     * Avoid tracking any regions that is not videoram and avoid tracking
+     * the legacy vga region. */
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        if (!strcmp(block->idstr, "vga.vram") && block->offset == phys_offset
+                && start_addr > 0xbffff) {
+            goto go_physmap;
+        }
+    }
+    return -1;
+
+go_physmap:
     DPRINTF("mapping vram to %llx - %llx, from %llx\n",
             start_addr, start_addr + size, phys_offset);