From nobody Mon Feb 9 12:11:41 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) client-ip=66.175.222.108; envelope-from=bounce+27952+88241+1787277+3901457@groups.io; helo=mail02.groups.io; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+88241+1787277+3901457@groups.io; dmarc=fail(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1648597724; cv=none; d=zohomail.com; s=zohoarc; b=HKO6RErmhtyyPMxrIG/lh4pNwftGks5wMfCH1g2fm4SXG9QeUVo6wixDZ4je6RoOeJL+b4Md0FJy7cUcac8cKNn8RjQ+y0fDb5Lra1inLxsmjm2HYhjiSgmFZSkvnO4bRaY6BW4iNuMlg0NQjyUiTj4oLilC9R55Ay+emf3SntM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1648597724; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:References:Sender:Subject:To; bh=6mkGVZJClAuFdHTMUwPktAV77WNUV0TGq0DTQ3Air9E=; b=ABAN1w2z2QZEojbSjxlB/EGdQuh7yt4JIzlX/w9HHu05qC/LpwHx6I1lQuotIHx3vVIulG7lDRsbhq2ZLkmkPlNwTvVZcRIUXjFGvLxzy9XkLeSqLw5dloiZk5Vj/57J3CGpK4RE36W/zzjYs8SrkaoXakbEcPCJ/OVA4vAYVX4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+88241+1787277+3901457@groups.io; dmarc=fail header.from= (p=none dis=none) Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by mx.zohomail.com with SMTPS id 1648597724241933.534379707933; Tue, 29 Mar 2022 16:48:44 -0700 (PDT) Return-Path: X-Received: by 127.0.0.2 with SMTP id kAeHYY1788612xPXgciUZbgc; Tue, 29 Mar 2022 16:48:43 -0700 X-Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by mx.groups.io with SMTP id smtpd.web09.1211.1648597723130196204 for ; Tue, 29 Mar 2022 16:48:43 -0700 X-IronPort-AV: E=McAfee;i="6200,9189,10301"; a="259375590" X-IronPort-AV: E=Sophos;i="5.90,220,1643702400"; d="scan'208";a="259375590" X-Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Mar 2022 16:48:38 -0700 X-IronPort-AV: E=Sophos;i="5.90,220,1643702400"; d="scan'208";a="521659118" X-Received: from zhangpen-mobl.ccr.corp.intel.com (HELO mxu9-mobl1.ccr.corp.intel.com) ([10.255.29.230]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Mar 2022 16:48:35 -0700 From: "Min Xu" To: devel@edk2.groups.io Cc: Min Xu , Ard Biesheuvel , Jordan Justen , Brijesh Singh , Erdem Aktas , James Bottomley , Jiewen Yao , Tom Lendacky , Gerd Hoffmann Subject: [edk2-devel] [PATCH V12 32/47] OvmfPkg/Sec: Declare local variable as volatile in SecCoreStartupWithStack Date: Wed, 30 Mar 2022 07:46:25 +0800 Message-Id: <79bea3361bf4f299a5a49c1f1f7c8a7589893168.1648555175.git.min.m.xu@intel.com> In-Reply-To: References: MIME-Version: 1.0 Precedence: Bulk List-Unsubscribe: List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,min.m.xu@intel.com X-Gm-Message-State: c8kq3QT1OuByUC4ZLAK7k4WHx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1648597723; bh=SH8nhsu8u8crb4ybCAtMmH8ajdzMBUVNnH9YLCriNyE=; h=Cc:Date:From:Reply-To:Subject:To; b=BGsQNVVNU3pK3vpSvhPB5U82Nuuxit7pP56y45Fn+n7hJDf3rMvOvzJz94tAEqa9+bE WxRxecuzZrIAheO1ZptZTU1JHqA4ozq9htIhJW9fPWmyWw3LWPXJgKQuCH1qKQxtyERkm JFjTXALv9L/x9B2EAzo6UylVnF7ZmaqG9EY= X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1648597724834100001 Content-Type: text/plain; charset="utf-8" RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3D3429 Declare the local variables in SecCoreStartupWithStack that actually move the data elements as volatile to prevent the optimizer from replacing this function with the intrinsic memcpy(). Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Brijesh Singh Cc: Erdem Aktas Cc: James Bottomley Cc: Jiewen Yao Cc: Tom Lendacky Cc: Gerd Hoffmann Acked-by: Gerd Hoffmann Signed-off-by: Min Xu --- OvmfPkg/Sec/SecMain.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/OvmfPkg/Sec/SecMain.c b/OvmfPkg/Sec/SecMain.c index 2c5561661ef3..02520e25ab9a 100644 --- a/OvmfPkg/Sec/SecMain.c +++ b/OvmfPkg/Sec/SecMain.c @@ -757,12 +757,17 @@ SecCoreStartupWithStack ( // IdtTableInStack.PeiService =3D NULL; for (Index =3D 0; Index < SEC_IDT_ENTRY_COUNT; Index++) { - UINT8 *Src; - UINT8 *Dst; - UINTN Byte; + // + // Declare the local variables that actually move the data elements as + // volatile to prevent the optimizer from replacing this function with + // the intrinsic memcpy() + // + CONST UINT8 *Src; + volatile UINT8 *Dst; + UINTN Byte; =20 - Src =3D (UINT8 *)&mIdtEntryTemplate; - Dst =3D (UINT8 *)&IdtTableInStack.IdtTable[Index]; + Src =3D (CONST UINT8 *)&mIdtEntryTemplate; + Dst =3D (volatile UINT8 *)&IdtTableInStack.IdtTable[Index]; for (Byte =3D 0; Byte < sizeof (mIdtEntryTemplate); Byte++) { Dst[Byte] =3D Src[Byte]; } --=20 2.29.2.windows.2 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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