I've also encountered same problem, the solution for me is:
--- linux-3.10-rc3.old/drivers/gpu/drm/qxl/Kconfig 2013-05-27
18:06:27.534000000 +0400
+++ linux-3.10-rc3/drivers/gpu/drm/qxl/Kconfig 2013-05-27
15:19:59.300000000 +0400
@@ -1,6 +1,7 @@
config DRM_QXL
tristate "QXL virtual GPU"
depends on DRM && PCI
+ select FB_DEFERRED_IO
select FB_SYS_FILLRECT
select FB_SYS_COPYAREA
select FB_SYS_IMAGEBLIT
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