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arm64/sme: Implement vector length configuration prctl()s

Browse Source 
As for SVE provide a prctl() interface which allows processes to
configure their SME vector length.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-12-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2022-04-19 12:22:19 +01:00
committed by Catalin Marinas
parent 12f1bacfc5
commit 9e4ab6c891
6 changed files with 61 additions and 1 deletions
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12
kernel/sys.c
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@@ -117,6 +117,12 @@
#ifndef SVE_GET_VL
# define SVE_GET_VL() (-EINVAL)
#endif
#ifndef SME_SET_VL
# define SME_SET_VL(a) (-EINVAL)
#endif
#ifndef SME_GET_VL
# define SME_GET_VL() (-EINVAL)
#endif
#ifndef PAC_RESET_KEYS
# define PAC_RESET_KEYS(a, b) (-EINVAL)
#endif
@@ -2541,6 +2547,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
case PR_SVE_GET_VL:
error = SVE_GET_VL();
break;
case PR_SME_SET_VL:
error = SME_SET_VL(arg2);
break;
case PR_SME_GET_VL:
error = SME_GET_VL();
break;
case PR_GET_SPECULATION_CTRL:
if (arg3 || arg4 || arg5)
return -EINVAL;