[v10, 00/10] riscv: support kernel-mode Vector

[Lad, Prabhakar]

On Fri, Jan 12, 2024 at 6:32 AM <patchwork-bot+linux-riscv at kernel.org> wrote:
>
> Hello:
>
> This series was applied to riscv/linux.git (for-next)
> by Palmer Dabbelt <palmer at rivosinc.com>:
>
> On Thu, 11 Jan 2024 13:15:48 +0000 you wrote:
> > This series provides support running Vector in kernel mode.
> > Additionally, kernel-mode Vector can be configured to run without
> > turnning off preemption on a CONFIG_PREEMPT kernel. Along with the
> > suport, we add Vector optimized copy_{to,from}_user. And provide a
> > simple threshold to decide when to run the vectorized functions.
> >
> > We decided to drop vectorized memcpy/memset/memmove for the moment due
> > to the concern of memory side-effect in kernel_vector_begin(). The
> > detailed description can be found at v9[1]
> >
> > [...]
>
> Here is the summary with links:
>   - [v10,01/10] riscv: Add support for kernel mode vector
>     https://git.kernel.org/riscv/c/c0ae350f714f
>   - [v10,02/10] riscv: vector: make Vector always available for softirq context
>     https://git.kernel.org/riscv/c/ebf52ac30e4f
>   - [v10,03/10] riscv: Add vector extension XOR implementation
>     https://git.kernel.org/riscv/c/9ff97211a623
>   - [v10,04/10] riscv: sched: defer restoring Vector context for user
>     https://git.kernel.org/riscv/c/f4471252f3b9
>   - [v10,05/10] riscv: lib: vectorize copy_to_user/copy_from_user
>     https://git.kernel.org/riscv/c/145ca6eddd70
>   - [v10,06/10] riscv: fpu: drop SR_SD bit checking
>     https://git.kernel.org/riscv/c/25a830944773
>   - [v10,07/10] riscv: vector: do not pass task_struct into riscv_v_vstate_{save,restore}()
>     https://git.kernel.org/riscv/c/9dece8bf0343
>   - [v10,08/10] riscv: vector: use a mask to write vstate_ctrl
>     https://git.kernel.org/riscv/c/c05992747c96
>   - [v10,09/10] riscv: vector: use kmem_cache to manage vector context
>     https://git.kernel.org/riscv/c/660217429614
>   - [v10,10/10] riscv: vector: allow kernel-mode Vector with preemption
>     https://git.kernel.org/riscv/c/aa23c6172d33
>
With this series merged in RZ/Five stops booting [0], I dont get any
panic as such but it's a kernel freeze. Reverting this series all
boots up OK.

[0] https://paste.debian.net/hidden/a8293240/

Cheers,
Prabhakar

> You are awesome, thank you!
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