[Xen-devel] BUG: fbback doesn't unmap pages on disconnect

[Vladimir 'Ï-coder/phcoder' Serbinenko <phcoder@xxxxxxxxx>]

./tools/qemu-xen-traditional-dir-remote/hw/xenfb.c:

    /*
     * FIXME: qemu can't un-init gfx display (yet?).
     *   Replacing the framebuffer with anonymous shared memory
     *   instead.  This releases the guest pages and keeps qemu happy.
     */
    fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
                      PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
                      -1, 0);
Well it doesn't unmap. There is no unmap on this code path. And since
the mapping is read-write the pages which are supposed to be released,
are now not usable for holding paging table anymore. Can anyone suggest
a workaround to munmap those pages? Could this bug be fixed?

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