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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 02020C433E6 for ; Sun, 7 Feb 2021 03:11:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C71C064E76 for ; Sun, 7 Feb 2021 03:11:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229752AbhBGDLw (ORCPT ); Sat, 6 Feb 2021 22:11:52 -0500 Received: from mga11.intel.com ([192.55.52.93]:57510 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229636AbhBGDLu (ORCPT ); Sat, 6 Feb 2021 22:11:50 -0500 IronPort-SDR: p0rHIoPGNJjQVEgjRcNcIuhHlxLxWsExo1g+thgdUfNyFw7POpfRG/eVksY0NmY6TwcJSR4MjY ukaEpTUKgl7A== X-IronPort-AV: E=McAfee;i="6000,8403,9887"; a="178071324" X-IronPort-AV: E=Sophos;i="5.81,158,1610438400"; d="scan'208";a="178071324" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2021 19:11:09 -0800 IronPort-SDR: rCLAidvoDS4hgN4lukNGzYPt9TsJTau9z1VYX4InUYebc+1mHvjJQkon7h261h2FhyTf7SLfy9 kwMpkwbipUFA== X-IronPort-AV: E=Sophos;i="5.81,158,1610438400"; d="scan'208";a="584618075" Received: from shsi6026.sh.intel.com (HELO localhost) ([10.239.147.88]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2021 19:11:05 -0800 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 , Yu Wang , Reinette Chatre , Yin Fengwei , Shuo Liu , Borislav Petkov , Dave Hansen , Sean Christopherson , Dan Williams , Zhi Wang , Zhenyu Wang Subject: [PATCH v9 03/18] x86/acrn: Introduce acrn_cpuid_base() and hypervisor feature bits Date: Sun, 7 Feb 2021 11:10:25 +0800 Message-Id: <20210207031040.49576-4-shuo.a.liu@intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210207031040.49576-1-shuo.a.liu@intel.com> References: <20210207031040.49576-1-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 Acked-by: Borislav Petkov 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 | 16 ++++++++++++++++ arch/x86/kernel/cpu/acrn.c | 2 +- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h index ff259b69cde7..127f20672c5d 100644 --- a/arch/x86/include/asm/acrn.h +++ b/arch/x86/include/asm/acrn.h @@ -2,7 +2,23 @@ #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); +static inline u32 acrn_cpuid_base(void) +{ + if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) + return hypervisor_cpuid_base("ACRNACRNACRN", 0); + + return 0; +} + #endif /* _ASM_X86_ACRN_H */ diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index e0c181781905..23f5f27b5a02 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -21,7 +21,7 @@ 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