On 08/03/2011 01:56 AM, Avi Kivity wrote: > When trying to map an alias of a ram region, where the alias starts at > address A and we map it into address B, and A > B, we had an arithmetic > underflow. Because we use unsigned arithmetic, the underflow converted > into a large number which failed addrrange_intersects() tests. > > The concrete example which triggered this was cirrus vga mapping > the framebuffer at offsets 0xc0000-0xc7fff (relative to the start of > the framebuffer) into offsets 0xa0000 (relative to system addres space > start). > > With our favorite analogy of a windowing system, this is equivalent to > dragging a subwindow off the left edge of the screen, and failing to clip > it into its parent window which is on screen. > > Fix by switching to signed arithmetic. > > Signed-off-by: Avi Kivity <a...@redhat.com>
Signed-off-by: Richard Henderson <r...@twiddle.net> r~
