diff options
| author | Guo Ren <[email protected]> | 2023-06-05 11:07:03 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <[email protected]> | 2023-06-08 07:16:39 -0700 |
| commit | 74abe5a39d3a110f4c87c8ff34b80705009a96e0 (patch) | |
| tree | b2ee1ac0c4ca100a4efa36fddb408eefeda81006 | |
| parent | 6b533828726af4e3609aeb6e5f494e936f9a7cde (diff) | |
riscv: Disable Vector Instructions for kernel itself
Disable vector instructions execution for kernel mode at its entrances.
This helps find illegal uses of vector in the kernel space, which is
similar to the fpu.
Signed-off-by: Guo Ren <[email protected]>
Co-developed-by: Vincent Chen <[email protected]>
Signed-off-by: Vincent Chen <[email protected]>
Co-developed-by: Han-Kuan Chen <[email protected]>
Signed-off-by: Han-Kuan Chen <[email protected]>
Co-developed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
Signed-off-by: Andy Chiu <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>
| -rw-r--r-- | arch/riscv/kernel/entry.S | 6 | ||||
| -rw-r--r-- | arch/riscv/kernel/head.S | 12 |
2 files changed, 9 insertions, 9 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 3fbb100bc9e4..e9ae284a55c1 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -48,10 +48,10 @@ _save_context: * Disable user-mode memory access as it should only be set in the * actual user copy routines. * - * Disable the FPU to detect illegal usage of floating point in kernel - * space. + * Disable the FPU/Vector to detect illegal usage of floating point + * or vector in kernel space. */ - li t0, SR_SUM | SR_FS + li t0, SR_SUM | SR_FS_VS REG_L s0, TASK_TI_USER_SP(tp) csrrc s1, CSR_STATUS, t0 diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 3fd6a4bd9c3e..e16bb2185d55 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -140,10 +140,10 @@ secondary_start_sbi: .option pop /* - * Disable FPU to detect illegal usage of - * floating point in kernel space + * Disable FPU & VECTOR to detect illegal usage of + * floating point or vector in kernel space */ - li t0, SR_FS + li t0, SR_FS_VS csrc CSR_STATUS, t0 /* Set trap vector to spin forever to help debug */ @@ -234,10 +234,10 @@ pmp_done: .option pop /* - * Disable FPU to detect illegal usage of - * floating point in kernel space + * Disable FPU & VECTOR to detect illegal usage of + * floating point or vector in kernel space */ - li t0, SR_FS + li t0, SR_FS_VS csrc CSR_STATUS, t0 #ifdef CONFIG_RISCV_BOOT_SPINWAIT |