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exec: fix writing to MMIO area with non-power-of-two length

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The problem is introduced by commit 2332616 (exec: Support 64-bit
operations in address_space_rw, 2013-07-08).  Before that commit,
memory_access_size would only return 1/2/4.

Since alignment is already handled above, reduce l to the largest
power of two that is smaller than l.

Cc: qemu-stable@nongnu.org
Reported-by: Oleksii Shevchuk <alxchk@gmail.com>
Tested-by: Oleksii Shevchuk <alxchk@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-07-29 14:27:39 +02:00
parent aaa6a40194
commit 098178f274
1 changed files with 3 additions and 0 deletions
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3
exec.c
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@ -1913,6 +1913,9 @@ static int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr)
if (l > access_size_max) {
l = access_size_max;
}
if (l & (l - 1)) {
l = 1 << (qemu_fls(l) - 1);
}
return l;
}