commit 24d87c187c46a935f2b6bd7194d9958fb28be786
author Richard Henderson <richard.henderson@linaro.org> Fri Jul 08 20:45:37 2022 +0530
committer Peter Maydell <peter.maydell@linaro.org> Mon Jul 11 13:43:52 2022 +0100
tree b7318aa25892738b19d3cb05229bfda19368e534
parent fd72f5d0bae2bcdb695cb8da57b41c49c001f91f

linux-user/aarch64: Implement PR_SME_GET_VL, PR_SME_SET_VL

These prctl set the Streaming SVE vector length, which may
be completely different from the Normal SVE vector length.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-43-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index cbde82c..991b85e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6343,6 +6343,12 @@
 #ifndef PR_SET_SYSCALL_USER_DISPATCH
 # define PR_SET_SYSCALL_USER_DISPATCH 59
 #endif
+#ifndef PR_SME_SET_VL
+# define PR_SME_SET_VL  63
+# define PR_SME_GET_VL  64
+# define PR_SME_VL_LEN_MASK  0xffff
+# define PR_SME_VL_INHERIT   (1 << 17)
+#endif
 
 #include "target_prctl.h"
 
@@ -6383,6 +6389,12 @@
 #ifndef do_prctl_set_unalign
 #define do_prctl_set_unalign do_prctl_inval1
 #endif
+#ifndef do_prctl_sme_get_vl
+#define do_prctl_sme_get_vl do_prctl_inval0
+#endif
+#ifndef do_prctl_sme_set_vl
+#define do_prctl_sme_set_vl do_prctl_inval1
+#endif
 
 static abi_long do_prctl(CPUArchState *env, abi_long option, abi_long arg2,
                          abi_long arg3, abi_long arg4, abi_long arg5)
@@ -6434,6 +6446,10 @@
         return do_prctl_sve_get_vl(env);
     case PR_SVE_SET_VL:
         return do_prctl_sve_set_vl(env, arg2);
+    case PR_SME_GET_VL:
+        return do_prctl_sme_get_vl(env);
+    case PR_SME_SET_VL:
+        return do_prctl_sme_set_vl(env, arg2);
     case PR_PAC_RESET_KEYS:
         if (arg3 || arg4 || arg5) {
             return -TARGET_EINVAL;