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riscv: Add prctl controls for userspace vector management

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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>
This commit is contained in:
Andy Chiu
2023-06-05 11:07:18 +00:00
committed by Palmer Dabbelt
parent 50724efcb3
commit 1fd96a3e9d
8 changed files with 162 additions and 1 deletions
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12
kernel/sys.c
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@@ -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;