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| author | Remi Denis-Courmont | 2019-01-26 07:52:10 +0100 |
|---|---|---|
| committer | Peter Maydell | 2019-02-01 16:23:51 +0100 |
| commit | f6768aa1b4c6a80448eabd22bb9b4123c709caea (patch) | |
| tree | 585951c8095ce4bd679387276a0739809cc28b7c /hw/misc/iotkit-secctl.c | |
| parent | linux-user: Initialize aarch64 pac keys (diff) | |
| download | qemu-f6768aa1b4c6a80448eabd22bb9b4123c709caea.tar.gz qemu-f6768aa1b4c6a80448eabd22bb9b4123c709caea.tar.xz qemu-f6768aa1b4c6a80448eabd22bb9b4123c709caea.zip | |
target/arm: fix AArch64 virtual address space size
Since QEMU does not support the ARMv8.2-LVA, Large Virtual Address,
extension (yet), the VA address space is 48-bits plus a sign bit. User
mode can only handle the positive half of the address space, so that
makes a limit of 48 bits.
(With LVA, it would be 53 and 52 bits respectively.)
The incorrectly large address space conflicts with PAuth instructions,
which use bits 48-54 and 56-63 for the pointer authentication code. This
also conflicts with (as yet unsupported by QEMU) data tagging and with
the ARMv8.5-MTE extension.
Signed-off-by: Remi Denis-Courmont <remi.denis.courmont@huawei.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/misc/iotkit-secctl.c')
0 files changed, 0 insertions, 0 deletions