Re: [PATCH v2] linux-user/riscv: Add Zicboz extensions to hwprobe

[Andrew Jones <ajones@ventanamicro.com>]

On Thu, Nov 23, 2023 at 07:12:59PM +0100, Christoph Muellner wrote:
> From: Christoph Müllner <christoph.muellner@vrull.eu>
> 
> Upstream Linux recently added RISC-V Zicboz support to the hwprobe API.
> This patch introduces this for QEMU's user space emulator.
> 
> Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
> ---
>  linux-user/syscall.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 65ac3ac796..2f9a1c5279 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -8799,6 +8799,7 @@ static int do_getdents64(abi_long dirfd, abi_long arg2, abi_long count)
>  #define     RISCV_HWPROBE_EXT_ZBA      (1 << 3)
>  #define     RISCV_HWPROBE_EXT_ZBB      (1 << 4)
>  #define     RISCV_HWPROBE_EXT_ZBS      (1 << 5)
> +#define     RISCV_HWPROBE_EXT_ZICBOZ   (1 << 6)
>  
>  #define RISCV_HWPROBE_KEY_CPUPERF_0     5
>  #define     RISCV_HWPROBE_MISALIGNED_UNKNOWN     (0 << 0)
> @@ -8855,6 +8856,8 @@ static void risc_hwprobe_fill_pairs(CPURISCVState *env,
>                       RISCV_HWPROBE_EXT_ZBB : 0;
>              value |= cfg->ext_zbs ?
>                       RISCV_HWPROBE_EXT_ZBS : 0;
> +            value |= cfg->ext_zicboz ?
> +                     RISCV_HWPROBE_EXT_ZICBOZ : 0;
>              __put_user(value, &pair->value);
>              break;
>          case RISCV_HWPROBE_KEY_CPUPERF_0:
> -- 
> 2.41.0
> 
>

We should also add support for getting the block size with
RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE.

Thanks,
drew