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riscv: vector: use a mask to write vstate_ctrl

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riscv_v_ctrl_set() should only touch bits within
PR_RISCV_V_VSTATE_CTRL_MASK. So, use the mask when we really set task's
vstate_ctrl.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20240115055929.4736-9-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu 2024-01-15 05:59:27 +00:00 committed by Palmer Dabbelt
parent d6c78f1ca3
commit 5b6048f2ff
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1 changed files with 2 additions and 1 deletions
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arch/riscv/kernel/vector.c
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@ -122,7 +122,8 @@ static inline void riscv_v_ctrl_set(struct task_struct *tsk, int cur, int nxt,
ctrl |= VSTATE_CTRL_MAKE_NEXT(nxt);
if (inherit)
ctrl |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
tsk->thread.vstate_ctrl = ctrl;
tsk->thread.vstate_ctrl &= ~PR_RISCV_V_VSTATE_CTRL_MASK;
tsk->thread.vstate_ctrl |= ctrl;
}
bool riscv_v_vstate_ctrl_user_allowed(void)