From patchwork Mon Jul 31 06:32:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 128404 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:918b:0:b0:3e4:2afc:c1 with SMTP id s11csp1862543vqg; Mon, 31 Jul 2023 01:02:31 -0700 (PDT) X-Google-Smtp-Source: APBJJlHeshOuL5RRkdZy6I/YhGx+dWzKFtCf3+jnaQdlQxQp3t6P429Y9TrJMzWQ8oj8VOaSd7FO X-Received: by 2002:a05:6a00:1991:b0:66a:4a45:e017 with SMTP id d17-20020a056a00199100b0066a4a45e017mr10923144pfl.20.1690790551444; Mon, 31 Jul 2023 01:02:31 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1690790551; cv=none; d=google.com; s=arc-20160816; b=BtcVJH1+R9jkdzVyvT2xGlZIXEQAOdtbL3w3gI/y0lysyZuU6GIuWRgA+UUacy22R0 GIEC7Zz+HXOHTPXdiI/N29BFTnVTHa8qdf8szJH6NKnZgLL2iYvKbv9Ht0R7wo76B3z7 c2gyA5YM9UAMRPu+7CcNQjdxzD+McGecnhL0jeRB5uAdd57SDSgPbG50Ykh0/OQ15x/c ekFsxO7cmiY/8qQKyHDP7Y+KXhfKnygpKacSLySeHwm9qVbx4ND9wNKNiZQPmXfwp6YD w4L+t4SQoswqQ1UOGYMNW8gt8cs+Desk5J7oWPt+/tsCcyz6TsfE+aORAGDUx0A9D7BS dfOg== 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=0S8DbAAY86CzQHam2kzPwUhecu473PoAuwZ3S9hYzPg=; fh=runz8kYc7mvoALl4f6YJmLswtUHBUyF5+hFgjyimmLU=; b=s07CeQtRwWUJS2pdadb8+NplUmgOJ0EAiXCiR4xdAiWqYnnRvM6jezF+il+WYz+j/u SR5NkStljXXrv/m6Oj0JElS8NM1cY5dlDmPDIlzUnBbdw9Et75oViBtVv90R/Ni0Wr0Q vOKH13epVXOZjwKvfYOrUbfU7tpA/RlWq6jzeHweO1/tNI2VuQzJACH5h09xmdWTekYe vzRHZhQOj5Kv8o6y+QRw3Qx85F3LxvJJjfTT6302+KUGcnLtL4Leg4v583U38UHT9zwI sZoa7wapNhLWvnN7de5mAA9RvbltrhLMhf7Yt3N0zaQz7068kZdOAQoyZK0lVVwmUIXU A5jA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=J0LdpU5r; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 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 (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id w184-20020a6282c1000000b00679a6ce03f6si3350154pfd.59.2023.07.31.01.02.18; Mon, 31 Jul 2023 01:02:31 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=J0LdpU5r; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231149AbjGaHDA (ORCPT + 99 others); Mon, 31 Jul 2023 03:03:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230470AbjGaHCO (ORCPT ); Mon, 31 Jul 2023 03:02:14 -0400 Received: from mgamail.intel.com (unknown [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43F11E7B; Mon, 31 Jul 2023 00:02:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1690786932; x=1722322932; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lZsnH9xZ+sSI0HJfWdXFi2jVveN7fME2POBe5mQbKKE=; b=J0LdpU5rSmCuBwzkdRgVcfNkCXN4YDZW9i6UpATzZXkMhv3H3dFMbCdL u+CgWOHx4YPkeXuXx6fqMo9KGymbbBnaY6mut4yWQWO/B40B+qroLttVa ShuknVTU1EOwSB0+ih+HfernHtcZhNmBbB27+FxFeoEz0Ge0wGV76Tz3R BmJONRngwVM15yn6k9QjIc/42TGDnty9o1DnAnM9V0B5NzNbUQWxvmDsu JMA5/10NjT5i4UMF6NO4TvZdeWkc3mbYcuuy0Grcs3yIBQNkqTf8gPZLh fZZwOzrJFPuK4aeuajYFSiK7W+1PdMiFwJ+yE1HY3XNplW9ecEwOVqU5a w==; X-IronPort-AV: E=McAfee;i="6600,9927,10787"; a="371648999" X-IronPort-AV: E=Sophos;i="6.01,244,1684825200"; d="scan'208";a="371648999" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jul 2023 00:02:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.01,202,1684825200"; d="scan'208";a="871543400" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga001.fm.intel.com with ESMTP; 31 Jul 2023 00:02:02 -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: Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andy Lutomirski , Oleg Nesterov , Tony Luck , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Sean Christopherson , Peter Zijlstra , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Josh Poimboeuf , "Paul E . McKenney" , Catalin Marinas , Randy Dunlap , Steven Rostedt , Kim Phillips , Xin Li , Hyeonggon Yoo <42.hyeyoo@gmail.com>, "Liam R . Howlett" , Sebastian Reichel , "Kirill A . Shutemov" , Suren Baghdasaryan , Pawan Gupta , Jiaxi Chen , Babu Moger , Jim Mattson , Sandipan Das , Lai Jiangshan , Hans de Goede , Reinette Chatre , Daniel Sneddon , Breno Leitao , Nikunj A Dadhania , Brian Gerst , Sami Tolvanen , Alexander Potapenko , Andrew Morton , Arnd Bergmann , "Eric W . Biederman" , Kees Cook , Masami Hiramatsu , Masahiro Yamada , Ze Gao , Fei Li , Conghui , Ashok Raj , "Jason A . Donenfeld" , Mark Rutland , Jacob Pan , Jiapeng Chong , Jane Malalane , David Woodhouse , Boris Ostrovsky , Arnaldo Carvalho de Melo , Yantengsi , Christophe Leroy , Sathvika Vasireddy Subject: [PATCH v9 12/36] x86/fred: Update MSR_IA32_FRED_RSP0 during task switch Date: Sun, 30 Jul 2023 23:32:53 -0700 Message-Id: <20230731063317.3720-13-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230731063317.3720-1-xin3.li@intel.com> References: <20230731063317.3720-1-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,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE 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-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772922393194139064 X-GMAIL-MSGID: 1772922393194139064 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. Update MSR_IA32_FRED_RSP0 with WRMSR instruction for now, and will use WRMSRNS/WRMSRLIST for performance once it gets upstreamed. Signed-off-by: H. Peter Anvin (Intel) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/include/asm/switch_to.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h index f42dbf17f52b..6c911fd400b2 100644 --- a/arch/x86/include/asm/switch_to.h +++ b/arch/x86/include/asm/switch_to.h @@ -70,9 +70,16 @@ 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)) { + /* + * Will use WRMSRNS/WRMSRLIST for performance once it's upstreamed. + */ + wrmsrl(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 }