Re: [Qemu-devel] [Qemu-trivial] [PATCH] linux-user: Add random ioctls

[Laurent Vivier <lvivier@redhat.com>]

On 05/10/2017 00:06, Marco A L Barbosa wrote:
> I don't know how (and if it is necessary) to add buf field to
> rand_pool_info struct. See
> https://github.com/torvalds/linux/blob/5924bbecd0267d87c24110cbe2041b5075173a25/include/uapi/linux/random.h#L17

I doesn't look really trivial...

To manage the buf field you must read buf_size and it cannot be done in 
a generic way: you must define a function to translate the buffer, use 
IOCTL_SPECIAL() with RNDADDENTROPY and RNDGETPOOL.

You should send your patch using "git send-email" or "git publish" 
instead of adding it in you email client.

> Signed-off-by: Marco A L Barbosa <malbarbo@gmail.com
> <mailto:malbarbo@gmail.com>>
> ---
>  linux-user/ioctls.h        | 7 +++++++
>  linux-user/syscall.c       | 1 +
>  linux-user/syscall_defs.h  | 9 +++++++++
>  linux-user/syscall_types.h | 4 ++++
>  4 files changed, 21 insertions(+)
> 
> diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
> index e6997ff230..9240a83f30 100644
> --- a/linux-user/ioctls.h
> +++ b/linux-user/ioctls.h
> @@ -173,6 +173,13 @@
>    IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
>    IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
>  
> +  IOCTL(RNDGETENTCNT, IOC_R, MK_PTR(TYPE_INT))
> +  IOCTL(RNDADDTOENTCNT, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rand_pool_info)))

..., MK_PTR(TYPE_INT)

> +  IOCTL(RNDGETPOOL, IOC_R, MK_PTR(TYPE_INT))

... MK_PTR(MK_STRUCT(STRUCT_rand_pool_info))

Thanks,
Laurent