[PATCH -next v13 05/19] riscv: Disable Vector Instructions for kernel itself
Andy Chiu
andy.chiu at sifive.com
Wed Jan 25 06:20:42 PST 2023
Disable vector instructions execution for kernel mode at its entrances.
Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
Co-developed-by: Vincent Chen <vincent.chen at sifive.com>
Signed-off-by: Vincent Chen <vincent.chen at sifive.com>
Co-developed-by: Han-Kuan Chen <hankuan.chen at sifive.com>
Signed-off-by: Han-Kuan Chen <hankuan.chen at sifive.com>
Co-developed-by: Greentime Hu <greentime.hu at sifive.com>
Signed-off-by: Greentime Hu <greentime.hu at sifive.com>
Signed-off-by: Vineet Gupta <vineetg at rivosinc.com>
[vineetg: split off vecreg file clearing]
Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
---
arch/riscv/kernel/entry.S | 6 +++---
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 99d38fdf8b18..e38676d9a0d6 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -77,10 +77,10 @@ _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 ea803c96eeff..7cc975ce619d 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
--
2.17.1
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