diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2013-03-12 00:31:38 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-03-22 15:28:52 +0100 |
| commit | 87dc3fd13e9c573fc435678973d8eb9726d50c3b (patch) | |
| tree | ce8cd9f7db1faababf5278f927778a0bc1b3f14f /qemu-tech.texi | |
| parent | 59acbe28552eb7bd7be75b22b3f3de93d7d40556 (diff) | |
mmu-hash*: Don't update PTE flags when permission is denied
BEHAVIOUR CHANGE
Currently if ppc_hash{32,64}_translate() finds a PTE matching the given
virtual address, it will always update the PTE's R & C (Referenced and
Changed) bits. This happens even if the PTE's permissions mean we are
about to deny the translation.
This is clearly a bug, although we get away with it because:
a) It will only incorrectly set, never reset the bits, which should not
cause guest correctness problems.
b) Linux guests never use the R & C bits anyway.
This patch fixes the behaviour, only updating R & C when access is granted
by the PTE.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'qemu-tech.texi')
0 files changed, 0 insertions, 0 deletions