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| author | Cédric Le Goater <clg@fr.ibm.com> | 2014-02-04 18:21:39 +0100 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-03-05 03:06:25 +0100 |
| commit | 363248e8c92c6331253e2a768884c69183805050 (patch) | |
| tree | 6fbc93ee17afab3f7efdf6c69dd496169d2fad80 /dma-helpers.c | |
| parent | 0dc083fe10c5cc848f36498b9157a336cbc8c7c1 (diff) | |
mmu-hash64: fix Virtual Page Class Key Protection
commit f80872e21c07edd06eb343eeeefc8af404b518a6 (mmu-hash64: Implement
Virtual Page Class Key Protection) added a new page protection
mechanism based on page keys and the AMR register to control access.
The AMR register allows or prohibits reads and/or writes on a page
depending on the control bits associated to the key. A store or a load
is only permitted if the associate bit is 0 (Power ISA), and not 1 as
the code is currently doing. This patch modifies ppc_hash64_amr_prot()
to correct the protection check.
This issue was unvailed by commit ccfb53ed6360cac0d5f6f7915ca9ae7eed866412
(target-ppc: fix Authority Mask Register init value) which changed the
initialisation value of the AMR register to 0.
Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'dma-helpers.c')
0 files changed, 0 insertions, 0 deletions