From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751344Ab2G0Jpc (ORCPT ); Fri, 27 Jul 2012 05:45:32 -0400 Received: from smtp.ctxuk.citrix.com ([62.200.22.115]:29693 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750968Ab2G0Jpb (ORCPT ); Fri, 27 Jul 2012 05:45:31 -0400 X-IronPort-AV: E=Sophos;i="4.77,666,1336348800"; d="scan'208";a="13730930" Message-ID: <1343382276.6812.126.camel@zakaz.uk.xensource.com> Subject: Re: [PATCH 13/24] xen/arm: get privilege status From: Ian Campbell To: Stefano Stabellini CC: "linux-kernel@vger.kernel.org" , "xen-devel@lists.xensource.com" , "konrad.wilk@oracle.com" , "Tim (Xen.org)" , "linux-arm-kernel@lists.infradead.org" , "linaro-dev@lists.linaro.org" , "catalin.marinas@arm.com" , "arnd@arndb.de" Date: Fri, 27 Jul 2012 10:44:36 +0100 In-Reply-To: <1343316846-25860-13-git-send-email-stefano.stabellini@eu.citrix.com> References: <1343316846-25860-13-git-send-email-stefano.stabellini@eu.citrix.com> Organization: Citrix Systems, Inc. Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.4.3-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2012-07-26 at 16:33 +0100, Stefano Stabellini wrote: > Use Xen features to figure out if we are privileged. > > XENFEAT_dom0 was introduced by 23735 in xen-unstable.hg. > > Signed-off-by: Stefano Stabellini > --- > 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 dc68074..2e013cf 100644 > --- a/arch/arm/xen/enlighten.c > +++ b/arch/arm/xen/enlighten.c > @@ -2,6 +2,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -58,6 +59,12 @@ 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); What happens here on platforms prior to hypervisor changeset 23735? > + > /* already setup */ > if (shared_info_page != 0 && HYPERVISOR_shared_info == shared_info_page) > return 0; > 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__ */