Re: [PATCH v2 13/23] xen/arm: get privilege status

Konrad Rzeszutek Wilk
2012-08-07T18:33:55Z

On Mon, Aug 06, 2012 at 03:27:16PM +0100, Stefano Stabellini wrote:
> Use Xen features to figure out if we are privileged.
>
> XENFEAT_dom0 was introduced by 23735 in xen-unstable.hg.

Looks good.

>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> ---
> arch/arm/xen/enlighten.c | 7 +++++++
> include/xen/interface/features.h | 3 +++
> 2 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 102d823..ac3a2d6 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -1,6 +1,7 @@
> #include <xen/xen.h>
> #include <xen/interface/xen.h>
> #include <xen/interface/memory.h>
> +#include <xen/features.h>
> #include <xen/platform_pci.h>
> #include <asm/xen/hypervisor.h>
> #include <asm/xen/hypercall.h>
> @@ -57,6 +58,12 @@ static int __init xen_guest_init(void)
> }
> xen_domain_type = XEN_HVM_DOMAIN;
>
> + xen_setup_features();
> + if (xen_feature(XENFEAT_dom0))
> + xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
> + else
> + xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
> +
> if (!shared_info_page)
> shared_info_page = (struct shared_info *)
> get_zeroed_page(GFP_KERNEL);
> diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
> index b6ca39a..131a6cc 100644
> --- a/include/xen/interface/features.h
> +++ b/include/xen/interface/features.h
> @@ -50,6 +50,9 @@
> /* x86: pirq can be used by HVM guests */
> #define XENFEAT_hvm_pirqs 10
>
> +/* operation as Dom0 is supported */
> +#define XENFEAT_dom0 11
> +
> #define XENFEAT_NR_SUBMAPS 1
>
> #endif /* __XEN_PUBLIC_FEATURES_H__ */
> --
> 1.7.2.5