From patchwork Mon Apr 10 08:14:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13206183 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FBEFC77B6F for ; Mon, 10 Apr 2023 08:41:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229721AbjDJIlz (ORCPT ); Mon, 10 Apr 2023 04:41:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49404 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229788AbjDJIlX (ORCPT ); Mon, 10 Apr 2023 04:41:23 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C6064EC2; Mon, 10 Apr 2023 01:41:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681116071; x=1712652071; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=O9acOeCuSr/+wKyZ7069qEc1yb3O4hIxP1jgg1zr2lE=; b=BeL26GLpLLY4x0pXd1dn8kkAg3eIMR46Q9sGZSPELWgST4Ipn0fLhmdw It6MrGABBVyDHH9XU2KGsX4QMdjjuNooEILNTeLt9O6QWhKKBvgFGK7R8 eIH3+HM2Ok1FwOCdlZyKU+cE5eU4/W8qlCO7hsV9ZYAAUZ/+7e1qYHGxH 0GWY11C5wtDCOyz2mvNlpnGAuK63lzUoQwwobty5h5TbmIGneASWrvHMz Zn5GOuH3HZ4Ue4YGYumMhFG3dkXuByjPgCyJsBWpwE0lxmwNd1VWOyIfX Ok9G3dKZlO6As/wc2H2lEiBlSagRshOLGHoCdCxrlwIPKexOLNbc4eFEL Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="342078118" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="342078118" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2023 01:41:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="799436334" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="799436334" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga002.fm.intel.com with ESMTP; 10 Apr 2023 01:41:06 -0700 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com, jiangshanlai@gmail.com, shan.kang@intel.com Subject: [PATCH v8 23/33] x86/fred: let ret_from_fork() jmp to fred_exit_user when FRED is enabled Date: Mon, 10 Apr 2023 01:14:28 -0700 Message-Id: <20230410081438.1750-24-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230410081438.1750-1-xin3.li@intel.com> References: <20230410081438.1750-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: "H. Peter Anvin (Intel)" Let ret_from_fork() jmp to fred_exit_user when FRED is enabled, otherwise the existing IDT code is chosen. Signed-off-by: H. Peter Anvin (Intel) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/entry/entry_64.S | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index eccc3431e515..5b595a9b2ffb 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -299,7 +299,12 @@ SYM_CODE_START_NOALIGN(ret_from_fork) UNWIND_HINT_REGS movq %rsp, %rdi call syscall_exit_to_user_mode /* returns with IRQs disabled */ +#ifdef CONFIG_X86_FRED + ALTERNATIVE "jmp swapgs_restore_regs_and_return_to_usermode", \ + "jmp fred_exit_user", X86_FEATURE_FRED +#else jmp swapgs_restore_regs_and_return_to_usermode +#endif 1: /* kernel thread */