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=-9.8 required=3.0 tests=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 289E4C3A589 for ; Fri, 16 Aug 2019 02:34:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 028122089E for ; Fri, 16 Aug 2019 02:34:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726875AbfHPCeB (ORCPT ); Thu, 15 Aug 2019 22:34:01 -0400 Received: from mga09.intel.com ([134.134.136.24]:24671 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726364AbfHPCdB (ORCPT ); Thu, 15 Aug 2019 22:33:01 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Aug 2019 19:33:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,391,1559545200"; d="scan'208";a="194894469" Received: from genxtest-ykzhao.sh.intel.com ([10.239.143.71]) by fmsmga001.fm.intel.com with ESMTP; 15 Aug 2019 19:32:59 -0700 From: Zhao Yakui To: x86@kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org Cc: Zhao Yakui , Jason Chen CJ Subject: [RFC PATCH 01/15] x86/acrn: Report X2APIC for ACRN guest Date: Fri, 16 Aug 2019 10:25:42 +0800 Message-Id: <1565922356-4488-2-git-send-email-yakui.zhao@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1565922356-4488-1-git-send-email-yakui.zhao@intel.com> References: <1565922356-4488-1-git-send-email-yakui.zhao@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org After lapic is switched from xapic to x2apic mode, it can use the APIC MSR register to access local apic register in ACRN guest. This will help to remove some traps of lapic access in ACRN guest. Report the X2APIC so that the ACRN guest can be switched to x2apic mode. Co-developed-by: Jason Chen CJ Signed-off-by: Jason Chen CJ Signed-off-by: Zhao Yakui --- arch/x86/kernel/cpu/acrn.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index 676022e..95db5c4 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -29,12 +30,7 @@ static void __init acrn_init_platform(void) static bool acrn_x2apic_available(void) { - /* - * x2apic is not supported for now. Future enablement will have to check - * X86_FEATURE_X2APIC to determine whether x2apic is supported in the - * guest. - */ - return false; + return boot_cpu_has(X86_FEATURE_X2APIC); } static void (*acrn_intr_handler)(void); -- 2.7.4