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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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21
docs/system/arm/cpu-features.rst
View file

@ -211,6 +211,27 @@ the list of KVM VCPU features and their descriptions.
influence the guest scheduler behavior and/or be
exposed to the guest userspace.
TCG VCPU Features
=================
TCG VCPU features are CPU features that are specific to TCG.
Below is the list of TCG VCPU features and their descriptions.
pauth Enable or disable `FEAT_Pauth`, pointer
authentication. By default, the feature is
enabled with `-cpu max`.
pauth-impdef When `FEAT_Pauth` is enabled, either the
*impdef* (Implementation Defined) algorithm
is enabled or the *architected* QARMA algorithm
is enabled. By default the impdef algorithm
is disabled, and QARMA is enabled.
The architected QARMA algorithm has good
cryptographic properties, but can be quite slow
to emulate. The impdef algorithm used by QEMU
is non-cryptographic but significantly faster.
SVE CPU Properties
==================