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target/arm: Add cpu properties for SME

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Mirror the properties for SVE.  The main difference is
that any arbitrary set of powers of 2 may be supported,
and not the stricter constraints that apply to SVE.

Include a property to control FEAT_SME_FA64, as failing
to restrict the runtime to the proper subset of insns
could be a major point for bugs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220620175235.60881-18-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-20 10:52:01 -07:00 • committed by Peter Maydell
parent 70cc9ee19e
commit e74c097638
5 changed files with 180 additions and 7 deletions
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14
target/arm/cpu.c
View file

@ -1123,11 +1123,13 @@ static void arm_cpu_initfn(Object *obj)
#ifdef CONFIG_USER_ONLY
# ifdef TARGET_AARCH64
/*
* The linux kernel defaults to 512-bit vectors, when sve is supported.
* See documentation for /proc/sys/abi/sve_default_vector_length, and
* our corresponding sve-default-vector-length cpu property.
* The linux kernel defaults to 512-bit for SVE, and 256-bit for SME.
* These values were chosen to fit within the default signal frame.
* See documentation for /proc/sys/abi/{sve,sme}_default_vector_length,
* and our corresponding cpu property.
*/
cpu->sve_default_vq = 4;
cpu->sme_default_vq = 2;
# endif
#else
/* Our inbound IRQ and FIQ lines */
@ -1430,6 +1432,12 @@ void arm_cpu_finalize_features(ARMCPU *cpu, Error **errp)
return;
}
arm_cpu_sme_finalize(cpu, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return;
}
arm_cpu_pauth_finalize(cpu, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);