From patchwork Tue Oct 3 06:24:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 147651 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:2a8e:b0:403:3b70:6f57 with SMTP id in14csp1898658vqb; Mon, 2 Oct 2023 23:55:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFT2DTwwdO5WRb7XTlNl5fUFmmIjLPGvwStV1vTGOb+OPQDSGmMgXku2ZoBGd7OO8jdF1R1 X-Received: by 2002:a05:6a20:3947:b0:154:e887:f581 with SMTP id r7-20020a056a20394700b00154e887f581mr16042425pzg.58.1696316121718; Mon, 02 Oct 2023 23:55:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1696316121; cv=none; d=google.com; s=arc-20160816; b=eELJg+oXwzR3eTXxqvSUNYXfjM2dNvl5uQD0z4jMw/8BEivx2/mIgwJ9/FdncYNmLF YjNeuJVvZ4uhTnhCA8ztnOyREK/ealI6giTDpVtqft2C3Z2qXd6FUVYnttTqKzaqIgBP 1aweK6X8L/Ty8YPgAUoDxBZZijJjfPKtk6Ux0nGESpzAbGnOf8gTowsFzFa0Sc2i2hcL ueTjy5ZfKqLabl/wFBJWCQHXsw9D8S7TUkI3TWfkjihKq1GHqlYiXrKOkM1XfM5kRhxR VJvHJPikj6qvP0gQIdS9cjquadz3/hvpieR4dgXU39s+NXsVC0PGFh4d6t+NY2oX5hwF gAFA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=oRqk/sQnL3ES7VmPQpA31WEpUqe3NnkXYaJMISYry5Y=; fh=Tb1p8S3iOxe/kX/WSNC3xEJzSVgGJ5DaxSrKb+pzH+4=; b=dR+GO19yylxB+OlzogJvGw22WOeRku3OADOErCqR7HHBCjU2CFYTa53jr/GcJcfwYF ADS4WX87JlvkCcJZrUlbaN9zmYYDt0jTvHucmgFKoHjl0jNtw1RcIM27adHVl3Z3X8vO 2daEFkaWPhfkAa6d4sv1Scvnc+ahdSMDa8k9njKP3uvjA9IQfgYKBCgQc9W9nfmIZD/o +jzz3Ggzx/BKl+YSW+LctKeRtECjX/3EZBA//HTwt8+mOqwwLHI4qgzCQAmml6du6hul duwZ2ZVVdyFy4BozMzUc6PnhMZtagpQc0snH1yYcFDnY4KAe36na9H82Z6tYblV9curd zP/g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=E6xK7K0N; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from snail.vger.email (snail.vger.email. [23.128.96.37]) by mx.google.com with ESMTPS id r77-20020a632b50000000b0057e5d66c200si799349pgr.462.2023.10.02.23.55.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Oct 2023 23:55:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=E6xK7K0N; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id 1276B812D218; Mon, 2 Oct 2023 23:55:21 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239220AbjJCGzR (ORCPT + 18 others); Tue, 3 Oct 2023 02:55:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50068 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239235AbjJCGyy (ORCPT ); Tue, 3 Oct 2023 02:54:54 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7BD9A193; Mon, 2 Oct 2023 23:54:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696316088; x=1727852088; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U5v5FfPZcbv+kEeu4BDXYc9n8fkslqM+14uJJDiLwkk=; b=E6xK7K0NwPyTIhln7AoM2Bm+kEYbdK8F3LtCDYeGtxgiiFCM15szhw2h 5lP3lldMGSFsJwOJ7FQS/uL0xvfxdAnvgsWCI0dcIsphGzHp10fJzjLuY oT/PcKRlagcf4Ouh1DtVrCqf76RcN3UuiGkLnMPT6tlqsGzSzDjfNeLuY lEpFfUjDbxeBcJn7/S5lEgmA7WT4I9sDvBZpQORrGIx5t5Y0KiFHvJrcI LoP+lX/1gGOKBYdU5DkBteO6JpoAMugCm5/IYlgrDtnv2+spCWSH/zmC0 MYSpCwi1Zq/BBLeNuAVwWy5AfU+fTmYj+4/+9s+wcmiOtrP9UgNYgjvzu w==; X-IronPort-AV: E=McAfee;i="6600,9927,10851"; a="367858125" X-IronPort-AV: E=Sophos;i="6.03,196,1694761200"; d="scan'208";a="367858125" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2023 23:54:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10851"; a="1081900954" X-IronPort-AV: E=Sophos;i="6.03,196,1694761200"; d="scan'208";a="1081900954" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga005.fm.intel.com with ESMTP; 02 Oct 2023 23:54:44 -0700 From: Xin Li To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, pbonzini@redhat.com, seanjc@google.com, peterz@infradead.org, jgross@suse.com, ravi.v.shankar@intel.com, mhiramat@kernel.org, andrew.cooper3@citrix.com, jiangshanlai@gmail.com, nik.borisov@suse.com Subject: [PATCH v12 19/37] x86/fred: Update MSR_IA32_FRED_RSP0 during task switch Date: Mon, 2 Oct 2023 23:24:40 -0700 Message-Id: <20231003062458.23552-20-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231003062458.23552-1-xin3.li@intel.com> References: <20231003062458.23552-1-xin3.li@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Mon, 02 Oct 2023 23:55:21 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778716374027817896 X-GMAIL-MSGID: 1778716374027817896 From: "H. Peter Anvin (Intel)" MSR_IA32_FRED_RSP0 is used during ring 3 event delivery, and needs to be updated to point to the top of next task stack during task switch. Signed-off-by: H. Peter Anvin (Intel) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/include/asm/switch_to.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h index f42dbf17f52b..c3bd0c0758c9 100644 --- a/arch/x86/include/asm/switch_to.h +++ b/arch/x86/include/asm/switch_to.h @@ -70,9 +70,13 @@ static inline void update_task_stack(struct task_struct *task) #ifdef CONFIG_X86_32 this_cpu_write(cpu_tss_rw.x86_tss.sp1, task->thread.sp0); #else - /* Xen PV enters the kernel on the thread stack. */ - if (cpu_feature_enabled(X86_FEATURE_XENPV)) + if (cpu_feature_enabled(X86_FEATURE_FRED)) { + /* WRMSRNS is a baseline feature for FRED. */ + wrmsrns(MSR_IA32_FRED_RSP0, (unsigned long)task_stack_page(task) + THREAD_SIZE); + } else if (cpu_feature_enabled(X86_FEATURE_XENPV)) { + /* Xen PV enters the kernel on the thread stack. */ load_sp0(task_top_of_stack(task)); + } #endif }