diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2019-01-07 15:23:48 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-01-07 15:23:48 +0000 |
| commit | 619d54a8d854e797bf5627843a5e31015deda202 (patch) | |
| tree | 031b48ae91f4e698f07ace548d8b9858079ced6f | |
| parent | 96c552958dbb63453b5f02bea6e704006d50e39a (diff) | |
hw/misc/tz-mpc: Fix value of BLK_MAX register
In the TZ Memory Protection Controller, the BLK_MAX register is supposed
to return the maximum permitted value of the BLK_IDX register. Our
implementation incorrectly returned max+1 (ie the total number of
valid index values, since BLK_IDX is zero-based).
Correct this off-by-one error. Since we consistently initialize
and use s->blk_max throughout the implementation as the 'size'
of the LUT, just adjust the value we return when the guest reads
the BLK_MAX register, rather than trying to change the semantics
of the s->blk_max internal struct field.
Fixes: https://bugs.launchpad.net/qemu/+bug/1806824
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181213183249.3468-1-peter.maydell@linaro.org
| -rw-r--r-- | hw/misc/tz-mpc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/misc/tz-mpc.c b/hw/misc/tz-mpc.c index fb48a1540b..9a84be75ed 100644 --- a/hw/misc/tz-mpc.c +++ b/hw/misc/tz-mpc.c @@ -150,7 +150,7 @@ static MemTxResult tz_mpc_reg_read(void *opaque, hwaddr addr, r = s->ctrl; break; case A_BLK_MAX: - r = s->blk_max; + r = s->blk_max - 1; break; case A_BLK_CFG: /* We are never in "init in progress state", so this just indicates |