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[PATCH v5 43/45] target/arm: Only set ZEN in reset if SVE present
From: |
Richard Henderson |
Subject: |
[PATCH v5 43/45] target/arm: Only set ZEN in reset if SVE present |
Date: |
Wed, 6 Jul 2022 13:54:09 +0530 |
There's no reason to set CPACR_EL1.ZEN if SVE disabled.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/cpu.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 9c58be8b14..9b54443843 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -204,11 +204,10 @@ static void arm_cpu_reset(DeviceState *dev)
/* and to the FP/Neon instructions */
env->cp15.cpacr_el1 = FIELD_DP64(env->cp15.cpacr_el1,
CPACR_EL1, FPEN, 3);
- /* and to the SVE instructions */
- env->cp15.cpacr_el1 = FIELD_DP64(env->cp15.cpacr_el1,
- CPACR_EL1, ZEN, 3);
- /* with reasonable vector length */
+ /* and to the SVE instructions, with default vector length */
if (cpu_isar_feature(aa64_sve, cpu)) {
+ env->cp15.cpacr_el1 = FIELD_DP64(env->cp15.cpacr_el1,
+ CPACR_EL1, ZEN, 3);
env->vfp.zcr_el[1] = cpu->sve_default_vq - 1;
}
/*
--
2.34.1
- [PATCH v5 28/45] target/arm: Implement PSEL, (continued)
- [PATCH v5 28/45] target/arm: Implement PSEL, Richard Henderson, 2022/07/06
- [PATCH v5 31/45] target/arm: Reset streaming sve state on exception boundaries, Richard Henderson, 2022/07/06
- [PATCH v5 33/45] linux-user/aarch64: Clear tpidr2_el0 if CLONE_SETTLS, Richard Henderson, 2022/07/06
- [PATCH v5 34/45] linux-user/aarch64: Reset PSTATE.SM on syscalls, Richard Henderson, 2022/07/06
- [PATCH v5 37/45] linux-user/aarch64: Do not allow duplicate or short sve records, Richard Henderson, 2022/07/06
- [PATCH v5 39/45] linux-user/aarch64: Move sve record checks into restore, Richard Henderson, 2022/07/06
- [PATCH v5 40/45] linux-user/aarch64: Implement SME signal handling, Richard Henderson, 2022/07/06
- [PATCH v5 41/45] linux-user: Rename sve prctls, Richard Henderson, 2022/07/06
- [PATCH v5 42/45] linux-user/aarch64: Implement PR_SME_GET_VL, PR_SME_SET_VL, Richard Henderson, 2022/07/06
- [PATCH v5 43/45] target/arm: Only set ZEN in reset if SVE present,
Richard Henderson <=
- [PATCH v5 44/45] target/arm: Enable SME for user-only, Richard Henderson, 2022/07/06
- [PATCH v5 45/45] linux-user/aarch64: Add SME related hwcap entries, Richard Henderson, 2022/07/06
- Re: [PATCH v5 00/45] target/arm: Scalable Matrix Extension, Peter Maydell, 2022/07/07