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authorAndy Chiu <andy.chiu@sifive.com>2023-06-05 11:07:18 +0000
committerPalmer Dabbelt <palmer@rivosinc.com>2023-06-08 07:16:53 -0700
commit1fd96a3e9d5d4febe1a8486590ad52c048d1be77 (patch)
treec8f955b0183f12182763b56926e58441fc516a59 /kernel/sys.c
parent50724efcb370c61c64f75614763fb411e087f70c (diff)
riscv: Add prctl controls for userspace vector management
This patch add two riscv-specific prctls, to allow usespace control the use of vector unit: * PR_RISCV_V_SET_CONTROL: control the permission to use Vector at next, or all following execve for a thread. Turning off a thread's Vector live is not possible since libraries may have registered ifunc that may execute Vector instructions. * PR_RISCV_V_GET_CONTROL: get the same permission setting for the current thread, and the setting for following execve(s). Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Reviewed-by: Vincent Chen <vincent.chen@sifive.com> Link: https://lore.kernel.org/r/20230605110724.21391-22-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 339fee3eff6a..05f838929e72 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -140,6 +140,12 @@
#ifndef GET_TAGGED_ADDR_CTRL
# define GET_TAGGED_ADDR_CTRL() (-EINVAL)
#endif
+#ifndef RISCV_V_SET_CONTROL
+# define RISCV_V_SET_CONTROL(a) (-EINVAL)
+#endif
+#ifndef RISCV_V_GET_CONTROL
+# define RISCV_V_GET_CONTROL() (-EINVAL)
+#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
@@ -2708,6 +2714,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
error = !!test_bit(MMF_VM_MERGE_ANY, &me->mm->flags);
break;
#endif
+ case PR_RISCV_V_SET_CONTROL:
+ error = RISCV_V_SET_CONTROL(arg2);
+ break;
+ case PR_RISCV_V_GET_CONTROL:
+ error = RISCV_V_GET_CONTROL();
+ break;
default:
error = -EINVAL;
break;