linux-kernel - Re: [PATCH v06 27/36] uapi xen/gntdev.h: include xen/privcmd.h and define grant_ref

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Message-ID: <ff3e726a-8e03-4543-7190-e6f8229b9e99@suse.com>
Date:   Mon, 21 Aug 2017 15:33:05 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Mikko Rapeli <mikko.rapeli@....fi>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     xen-devel@...ts.xenproject.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH v06 27/36] uapi xen/gntdev.h: include xen/privcmd.h and
 define grant_ref_t

On 06/08/17 18:44, Mikko Rapeli wrote:
> Both are needed to compile <xen/gntdev.h> in userspace. Fixes these
> userspace compile errors:
> 
> xen/gntdev.h:151:4: error: unknown type name ‘grant_ref_t’
>     grant_ref_t ref;
>     ^
> xen/gntdev.h:153:4: error: unknown type name ‘domid_t’
>     domid_t domid;
>     ^
> 
> Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: xen-devel@...ts.xenproject.org
> ---
>  include/uapi/xen/gntdev.h           | 6 ++++++
>  include/xen/interface/grant_table.h | 6 +-----
>  2 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/include/uapi/xen/gntdev.h b/include/uapi/xen/gntdev.h
> index d0661977667e..f208706b07c9 100644
> --- a/include/uapi/xen/gntdev.h
> +++ b/include/uapi/xen/gntdev.h
> @@ -34,6 +34,12 @@
>  #define __LINUX_PUBLIC_GNTDEV_H__
>  
>  #include <linux/types.h>
> +#include <xen/privcmd.h>
> +
> +/*
> + * Reference to a grant entry in a specified domain's grant table.
> + */
> +typedef __u32 grant_ref_t;
>  
>  struct ioctl_gntdev_grant_ref {
>  	/* The domain ID of the grant to be mapped. */
> diff --git a/include/xen/interface/grant_table.h b/include/xen/interface/grant_table.h
> index 7fb7112d667c..29b3724aec2c 100644
> --- a/include/xen/interface/grant_table.h
> +++ b/include/xen/interface/grant_table.h
> @@ -29,6 +29,7 @@
>  #define __XEN_PUBLIC_GRANT_TABLE_H__
>  
>  #include <xen/interface/xen.h>
> +#include <uapi/xen/gntdev.h> /* for grant_ref_t */

Hmm, I really don't like this. We import the Xen headers from the Xen
source repository. The Xen specific types shouldn't be taken from
non-Xen headers.

>  
>  /***********************************
>   * GRANT TABLE REPRESENTATION
> @@ -85,11 +86,6 @@
>   */
>  
>  /*
> - * Reference to a grant entry in a specified domain's grant table.
> - */
> -typedef uint32_t grant_ref_t;
> -
> -/*
>   * A grant table comprises a packed array of grant entries in one or more
>   * page frames shared between Xen and a guest.
>   * [XEN]: This field is written by Xen and read by the sharing guest.
> 

I'd rather use __u32 instead of grant_ref_t in the uapi headers.

Boris, what do you think?


Juergen