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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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11
include/uapi/linux/prctl.h
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@@ -294,4 +294,15 @@ struct prctl_mm_map {
#define PR_SET_MEMORY_MERGE 67
#define PR_GET_MEMORY_MERGE 68
#define PR_RISCV_V_SET_CONTROL 69
#define PR_RISCV_V_GET_CONTROL 70
# define PR_RISCV_V_VSTATE_CTRL_DEFAULT 0
# define PR_RISCV_V_VSTATE_CTRL_OFF 1
# define PR_RISCV_V_VSTATE_CTRL_ON 2
# define PR_RISCV_V_VSTATE_CTRL_INHERIT (1 << 4)
# define PR_RISCV_V_VSTATE_CTRL_CUR_MASK 0x3
# define PR_RISCV_V_VSTATE_CTRL_NEXT_MASK 0xc
# define PR_RISCV_V_VSTATE_CTRL_MASK 0x1f
#endif /* _LINUX_PRCTL_H */