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target/arm: Add cpu properties to control pauth

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The crypto overhead of emulating pauth can be significant for
some workloads.  Add two boolean properties that allows the
feature to be turned off, on with the architected algorithm,
or on with an implementation defined algorithm.

We need two intermediate booleans to control the state while
parsing properties lest we clobber ID_AA64ISAR1 into an invalid
intermediate state.

Tested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210111235740.462469-3-richard.henderson@linaro.org
[PMM: fixed docs typo, tweaked text to clarify that the impdef
algorithm is specific to QEMU]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-01-11 13:57:39 -10:00 • committed by Peter Maydell
parent 283fc52ade
commit eb94284d08
6 changed files with 94 additions and 4 deletions
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13
target/arm/cpu.c
View file

@ -1320,6 +1320,19 @@ void arm_cpu_finalize_features(ARMCPU *cpu, Error **errp)
error_propagate(errp, local_err);
return;
}
/*
* KVM does not support modifications to this feature.
* We have not registered the cpu properties when KVM
* is in use, so the user will not be able to set them.
*/
if (!kvm_enabled()) {
arm_cpu_pauth_finalize(cpu, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return;
}
}
}
if (kvm_enabled()) {