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riscv: vector: Fix context save/restore with xtheadvector 

Previously only v0-v7 were correctly saved/restored,
and the context of v8-v31 are damanged.
Correctly save/restore v8-v31 to avoid breaking userspace.

Fixes: d863910eab ("riscv: vector: Support xtheadvector save/restore")
Cc: stable@vger.kernel.org
Signed-off-by: Han Gao <rabenda.cn@gmail.com>
Tested-by: Xiongchuan Tan <tanxiongchuan@isrc.iscas.ac.cn>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Reviewed-by: Andy Chiu <andybnac@gmail.com>
Link: https://lore.kernel.org/r/9b9eb2337f3d5336ce813721f8ebea51e0b2b553.1747994822.git.rabenda.cn@gmail.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
This commit is contained in:
Han Gao 2025-05-23 18:25:56 +08:00 committed by Palmer Dabbelt
parent 19272b37aa
commit 4262bd0d9c
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 6 additions and 6 deletions
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12
arch/riscv/include/asm/vector.h
View File

@ -205,11 +205,11 @@ static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
THEAD_VSETVLI_T4X0E8M8D1
THEAD_VSB_V_V0T0
"add t0, t0, t4\n\t"
THEAD_VSB_V_V0T0
THEAD_VSB_V_V8T0
"add t0, t0, t4\n\t"
THEAD_VSB_V_V0T0
THEAD_VSB_V_V16T0
"add t0, t0, t4\n\t"
THEAD_VSB_V_V0T0
THEAD_VSB_V_V24T0
: : "r" (datap) : "memory", "t0", "t4");
} else {
asm volatile (
@ -241,11 +241,11 @@ static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_
THEAD_VSETVLI_T4X0E8M8D1
THEAD_VLB_V_V0T0
"add t0, t0, t4\n\t"
THEAD_VLB_V_V0T0
THEAD_VLB_V_V8T0
"add t0, t0, t4\n\t"
THEAD_VLB_V_V0T0
THEAD_VLB_V_V16T0
"add t0, t0, t4\n\t"
THEAD_VLB_V_V0T0
THEAD_VLB_V_V24T0
: : "r" (datap) : "memory", "t0", "t4");
} else {
asm volatile (