On 12/4/24 15:12, Pierrick Bouvier wrote:
qemu-system-aarch64 default pointer authentication (QARMA5) is expensive, we
spent up to 50% of the emulation time running it (when using TCG).
Switching to pauth-impdef=on is often given as a solution to speed up execution.
Thus we talked about making it the new default.
The first patch introduce a new property (pauth-qarma5) to allow to select
current default algorithm.
The second one change the default.
Pierrick Bouvier (2):
target/arm: add new property to select pauth-qarma5
target/arm: change default pauth algorithm to impdef
docs/system/arm/cpu-features.rst | 7 +++++--
docs/system/introduction.rst | 2 +-
target/arm/cpu.h | 1 +
target/arm/arm-qmp-cmds.c | 2 +-
target/arm/cpu64.c | 30 +++++++++++++++++++-----------
tests/qtest/arm-cpu-features.c | 15 +++++++++++----
6 files changed, 38 insertions(+), 19 deletions(-)
I understand the motivation, but as-is this will break migration.
I think this will need to be versioned somehow, but the only thing that really
gets
versioned are the boards, and I'm not sure how to link that to the instantiated
cpu.