Re: [Qemu-devel] [PATCH v2] seccomp: add cacheflush to whitelist

[Peter Maydell <peter.maydell@linaro.org>]

On 2 November 2015 at 17:56, Andrew Jones <drjones@redhat.com> wrote:
> cacheflush is an arm-specific syscall that qemu built for arm
> uses. Add it to the whitelist, but only if we're linking with
> a recent enough libseccomp.
>
> Signed-off-by: Andrew Jones <drjones@redhat.com>
> ---
> v2: only add cacheflush if libseccomp supports it
>
>  qemu-seccomp.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/qemu-seccomp.c b/qemu-seccomp.c
> index 80d034a8d5190..e76097e958779 100644
> --- a/qemu-seccomp.c
> +++ b/qemu-seccomp.c
> @@ -16,6 +16,10 @@
>  #include <seccomp.h>
>  #include "sysemu/seccomp.h"
>
> +#if SCMP_VER_MAJOR >= 2 && SCMP_VER_MINOR >= 2 && SCMP_VER_MICRO >= 3
> +#define HAVE_CACHEFLUSH
> +#endif

This will claim that a hypothetical future version 3.0.0 does not
have cacheflush...

thanks
-- PMM