From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76BF7C43457 for ; Mon, 19 Oct 2020 06:18:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A86722263 for ; Mon, 19 Oct 2020 06:18:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726714AbgJSGSl (ORCPT ); Mon, 19 Oct 2020 02:18:41 -0400 Received: from mga02.intel.com ([134.134.136.20]:21152 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726663AbgJSGSj (ORCPT ); Mon, 19 Oct 2020 02:18:39 -0400 IronPort-SDR: VRSbNviPxMHjcDBB2HiwAli1VoKT2gpLNW0mEw+mXsqd8u7PzX/4UMp02VryUK66CLnUJUbwng TWkvv0jt/O3w== X-IronPort-AV: E=McAfee;i="6000,8403,9778"; a="153912590" X-IronPort-AV: E=Sophos;i="5.77,393,1596524400"; d="scan'208";a="153912590" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2020 23:18:37 -0700 IronPort-SDR: rKeJx9Rc2VNk06k+0YPgBaeNcVgxImdTIQo7XODbg8AAYYWwTBo0JVO7m9gN0Bj/C+6sQtib5O qBR1/rFgU3RA== X-IronPort-AV: E=Sophos;i="5.77,393,1596524400"; d="scan'208";a="347309932" Received: from shsi6026.sh.intel.com (HELO localhost) ([10.239.147.88]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2020 23:18:32 -0700 From: shuo.a.liu@intel.com To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Greg Kroah-Hartman , "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Sean Christopherson , Yu Wang , Reinette Chatre , Yin Fengwei , Shuo Liu , Dave Hansen , Dan Williams , Zhi Wang , Zhenyu Wang Subject: [PATCH v5 03/17] x86/acrn: Introduce an API to check if a VM is privileged Date: Mon, 19 Oct 2020 14:17:49 +0800 Message-Id: <20201019061803.13298-4-shuo.a.liu@intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201019061803.13298-1-shuo.a.liu@intel.com> References: <20201019061803.13298-1-shuo.a.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yin Fengwei ACRN Hypervisor reports hypervisor features via CPUID leaf 0x40000001 which is similar to KVM. A VM can check if it's the privileged VM using the feature bits. The Service VM is the only privileged VM by design. Signed-off-by: Yin Fengwei Signed-off-by: Shuo Liu Reviewed-by: Reinette Chatre Cc: Dave Hansen Cc: Sean Christopherson Cc: Dan Williams Cc: Fengwei Yin Cc: Zhi Wang Cc: Zhenyu Wang Cc: Yu Wang Cc: Reinette Chatre Cc: Greg Kroah-Hartman --- arch/x86/include/asm/acrn.h | 9 +++++++++ arch/x86/kernel/cpu/acrn.c | 19 ++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h index ff259b69cde7..a2d4aea3a80d 100644 --- a/arch/x86/include/asm/acrn.h +++ b/arch/x86/include/asm/acrn.h @@ -2,7 +2,16 @@ #ifndef _ASM_X86_ACRN_H #define _ASM_X86_ACRN_H +/* + * This CPUID returns feature bitmaps in EAX. + * Guest VM uses this to detect the appropriate feature bit. + */ +#define ACRN_CPUID_FEATURES 0x40000001 +/* Bit 0 indicates whether guest VM is privileged */ +#define ACRN_FEATURE_PRIVILEGED_VM BIT(0) + void acrn_setup_intr_handler(void (*handler)(void)); void acrn_remove_intr_handler(void); +bool acrn_is_privileged_vm(void); #endif /* _ASM_X86_ACRN_H */ diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index e0c181781905..5528bfc913ea 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -19,9 +19,26 @@ #include #include +static u32 acrn_cpuid_base(void) +{ + static u32 acrn_cpuid_base; + + if (!acrn_cpuid_base && boot_cpu_has(X86_FEATURE_HYPERVISOR)) + acrn_cpuid_base = hypervisor_cpuid_base("ACRNACRNACRN", 0); + + return acrn_cpuid_base; +} + +bool acrn_is_privileged_vm(void) +{ + return cpuid_eax(acrn_cpuid_base() | ACRN_CPUID_FEATURES) & + ACRN_FEATURE_PRIVILEGED_VM; +} +EXPORT_SYMBOL_GPL(acrn_is_privileged_vm); + static u32 __init acrn_detect(void) { - return hypervisor_cpuid_base("ACRNACRNACRN", 0); + return acrn_cpuid_base(); } static void __init acrn_init_platform(void) -- 2.28.0