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 98C97C43461 for ; Wed, 9 Sep 2020 09:09:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BB68216C4 for ; Wed, 9 Sep 2020 09:09:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729479AbgIIJJ0 (ORCPT ); Wed, 9 Sep 2020 05:09:26 -0400 Received: from mga04.intel.com ([192.55.52.120]:59860 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726293AbgIIJJP (ORCPT ); Wed, 9 Sep 2020 05:09:15 -0400 IronPort-SDR: 4RgY6XKWC6/fXPJeWwJAIeW8oXjEu9X7+N33tu/yCGfCJwyHnuXvSNx/2ma4yCrPEhAWp2zygs JhqW/ANgHFuA== X-IronPort-AV: E=McAfee;i="6000,8403,9738"; a="155697284" X-IronPort-AV: E=Sophos;i="5.76,409,1592895600"; d="scan'208";a="155697284" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2020 02:09:14 -0700 IronPort-SDR: ZNwBjmKKhQZ6o9j1588awhk5k3t5zv9oKsARtJeASSrOBZYnQSL1VokTahc2WOdWmlJ94Qc0n3 Xg2rIEV3WMbw== X-IronPort-AV: E=Sophos;i="5.76,409,1592895600"; d="scan'208";a="304428022" Received: from shsi6026.sh.intel.com (HELO localhost) ([10.239.147.135]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2020 02:09:10 -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 v3 03/17] x86/acrn: Introduce an API to check if a VM is privileged Date: Wed, 9 Sep 2020 17:08:22 +0800 Message-Id: <20200909090836.46762-4-shuo.a.liu@intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200909090836.46762-1-shuo.a.liu@intel.com> References: <20200909090836.46762-1-shuo.a.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org 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 bd1d7e759a0f..6f0a00cbbf7e 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -21,9 +21,26 @@ #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