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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 34/45] linux-user/aarch64: Reset PSTATE.SM on syscalls
Date: Mon, 11 Jul 2022 14:57:39 +0100
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From: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-35-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
linux-user/aarch64/cpu_loop.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index f7ef36cd9fa..9875d609a91 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -89,6 +89,15 @@ void cpu_loop(CPUARMState *env)
=20
switch (trapnr) {
case EXCP_SWI:
+ /*
+ * On syscall, PSTATE.ZA is preserved, along with the ZA matri=
x.
+ * PSTATE.SM is cleared, per SMSTOP, which does ResetSVEState.
+ */
+ if (FIELD_EX64(env->svcr, SVCR, SM)) {
+ env->svcr =3D FIELD_DP64(env->svcr, SVCR, SM, 0);
+ arm_rebuild_hflags(env);
+ arm_reset_sve_state(env);
+ }
ret =3D do_syscall(env,
env->xregs[8],
env->xregs[0],
--=20
2.25.1