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| author | Andy Chiu <andy.chiu@sifive.com> | 2024-05-10 00:26:57 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-05-30 14:33:10 -0700 |
| commit | ac295b67422d1a6627866453543b4880ab144572 (patch) | |
| tree | d4385fcda3aec1a1537408647f17d11877787b9c /arch/riscv/kernel/vector.c | |
| parent | riscv: hwprobe: add zve Vector subextensions into hwprobe interface (diff) | |
| download | linux-ac295b67422d1a6627866453543b4880ab144572.tar.gz linux-ac295b67422d1a6627866453543b4880ab144572.zip | |
riscv: vector: adjust minimum Vector requirement to ZVE32X
Make has_vector() to check for ZVE32X. Every in-kernel usage of V that
requires a more complicate version of V must then call out explicitly.
Also, change riscv_v_first_use_handler(), and boot code that calls
riscv_v_setup_vsize() to accept ZVE32X.
Most kernel/user interfaces requires minimum of ZVE32X. Thus, programs
compiled and run with ZVE32X should be supported by the kernel on most
aspects. This includes context-switch, signal, ptrace, prctl, and
hwprobe.
One exception is that ELF_HWCAP returns 'V' only if full V is supported
on the platform. This means that the system without a full V must not
rely on ELF_HWCAP to tell whether it is allowable to execute Vector
without first invoking a prctl() check.
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Acked-by: Joel Granados <j.granados@samsung.com>
Link: https://lore.kernel.org/r/20240510-zve-detection-v5-7-0711bdd26c12@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kernel/vector.c')
| -rw-r--r-- | arch/riscv/kernel/vector.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 6727d1d3b8f2..682b3feee451 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -173,8 +173,11 @@ bool riscv_v_first_use_handler(struct pt_regs *regs) u32 __user *epc = (u32 __user *)regs->epc; u32 insn = (u32)regs->badaddr; + if (!has_vector()) + return false; + /* Do not handle if V is not supported, or disabled */ - if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V)) + if (!riscv_v_vstate_ctrl_user_allowed()) return false; /* If V has been enabled then it is not the first-use trap */ |