Re: [PATCH] stubdom: foreignmemory: Fix build after 0dbb4be739c5

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 13/07/2021 10:20, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> Commit 0dbb4be739c5 add the inclusion of xenctrl.h from private.h and
> wreck the build in an interesting way:
>
> In file included from xen/stubdom/include/xen/domctl.h:39:0,
>                  from xen/tools/include/xenctrl.h:36,
>                  from private.h:4,
>                  from minios.c:29:
> xen/include/public/memory.h:407:5: error: expected specifier-qualifier-list 
> before ‘XEN_GUEST_HANDLE_64’
>      XEN_GUEST_HANDLE_64(const_uint8) buffer;
>      ^~~~~~~~~~~~~~~~~~~
>
> This is happening because xenctrl.h defines __XEN_TOOLS__ and therefore
> the public headers will start to expose the non-stable ABI. However,
> xen.h has already been included by a mini-OS header before hand. So
> there is a mismatch in the way the headers are included.
>
> For now solve it in a very simple (and gross) way by including
> xenctrl.h before the mini-os headers.
>
> Fixes: 0dbb4be739c5 ("tools/libs/foreignmemory: Fix PAGE_SIZE redefinition 
> error")
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
>
> ---
>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>
> I couldn't find a better way with would not result to revert the patch
> (and break build on some system) or involve a longer rework of the
> headers.
> ---
>  tools/libs/foreignmemory/minios.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/tools/libs/foreignmemory/minios.c 
> b/tools/libs/foreignmemory/minios.c
> index c5453736d598..d7b3f0e1c823 100644
> --- a/tools/libs/foreignmemory/minios.c
> +++ b/tools/libs/foreignmemory/minios.c
> @@ -17,6 +17,14 @@
>   * Copyright 2007-2008 Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>.
>   */
>  
> +/*
> + * xenctlr.h

xenctrl.h

Otherwise, Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

>  currently defines __XEN_TOOLS__ which affects what is
> + * exposed by Xen headers. As the define needs to be set consistently,
> + * we want to include xenctrl.h before the mini-os headers (they include
> + * public headers).
> + */
> +#include <xenctrl.h>
> +
>  #include <mini-os/types.h>
>  #include <mini-os/os.h>
>  #include <mini-os/mm.h>