[Qemu-commits] [qemu/qemu] a87f39: memory: fix limiting of translation at a page boun...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: a87f39543a9259f671c5413723311180ee2ad2a8
      
https://github.com/qemu/qemu/commit/a87f39543a9259f671c5413723311180ee2ad2a8
  Author: Paolo Bonzini <address@hidden>
  Date:   2014-02-10 (Mon, 10 Feb 2014)

  Changed paths:
    M exec.c

  Log Message:
  -----------
  memory: fix limiting of translation at a page boundary

Commit 360e607 (address_space_translate: do not cross page boundaries,
2014-01-30) broke MMIO accesses in cases where the section is shorter
than the full register width.  This can happen for example with the
Bochs DISPI registers, which are 16 bits wide but have only a 1-byte
long MemoryRegion (if you write to the "second byte" of the register
your access is discarded; it doesn't write only to half of the register).

Restrict the action of commit 360e607 to direct RAM accesses.  This
is enough for Xen, since MMIO will not go through the mapcache.

Reported-by: Mark Cave-Ayland <address@hidden>
Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
Tested-by: Mark Cave-Ayland <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>