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target/arm: Add sve-max-vq cpu property to -cpu max

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This allows the default (and maximum) vector length to be set
from the command-line.  Which is extraordinarily helpful in
debugging problems depending on vector length without having to
bake knowledge of PR_SET_SVE_VL into every guest binary.

Cc: qemu-stable@nongnu.org (3.0.1)
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-08-16 14:05:28 +01:00 • committed by Peter Maydell
parent 2bf5f3f91b
commit adf92eab90
5 changed files with 53 additions and 11 deletions
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6
target/arm/cpu.c
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@ -168,9 +168,9 @@ static void arm_cpu_reset(CPUState *s)
env->cp15.cpacr_el1 = deposit64(env->cp15.cpacr_el1, 16, 2, 3);
env->cp15.cptr_el[3] |= CPTR_EZ;
/* with maximum vector length */
env->vfp.zcr_el[1] = ARM_MAX_VQ - 1;
env->vfp.zcr_el[2] = ARM_MAX_VQ - 1;
env->vfp.zcr_el[3] = ARM_MAX_VQ - 1;
env->vfp.zcr_el[1] = cpu->sve_max_vq - 1;
env->vfp.zcr_el[2] = env->vfp.zcr_el[1];
env->vfp.zcr_el[3] = env->vfp.zcr_el[1];
#else
/* Reset into the highest available EL */
if (arm_feature(env, ARM_FEATURE_EL3)) {