From nobody Sat Nov 15 19:01:58 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1749559440; cv=none; d=zohomail.com; s=zohoarc; b=NMIyiVdzfNcOv23qZQgl9m8p+fH9E3XAhy2rcmnhA8bJAnuS/FPzdOG44IVI+hsbyodOCD8GINd31h2WfrVNm0OY8vWMGlk7+r4WEw5pSBNg/CiEdDgtzkjVlTWG5lVeSI8i3DCu37JodM8hLFhgnuVNeJDnoi5hLyaDnXDOH9s= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1749559440; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ee/NYdli3HnqooIdB4tbV7Jm18g0RefMEBG3CfHXwsA=; b=ZAt6arLtO+VvDyThqWXM8yCg5Uw/ElOT37adz9IHKrg+uKKdul8gHLNhHAMp/QufJO43hVX1dYBJPj5jdDC083chHLfGjgtNcQPFiFrN+nYsnpzPxgLnX8ERx7ZUzROH3H5eiUNTkqSl/Rs2kzOKgDwpogicLStXwz4eSPt22+E= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1749559440727189.34967971158346; Tue, 10 Jun 2025 05:44:00 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uOyIF-0006Um-6K; Tue, 10 Jun 2025 08:41:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uOyF7-0001LV-Nj for qemu-devel@nongnu.org; Tue, 10 Jun 2025 08:38:21 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uOyF5-0000SY-91 for qemu-devel@nongnu.org; Tue, 10 Jun 2025 08:38:17 -0400 Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-150-oXORVx7WPg6kd6buYQCEgw-1; Tue, 10 Jun 2025 08:38:03 -0400 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5B7BC18002A0; Tue, 10 Jun 2025 12:38:00 +0000 (UTC) Received: from toolbx.redhat.com (unknown [10.42.28.87]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 499B730001B1; Tue, 10 Jun 2025 12:37:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749559089; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ee/NYdli3HnqooIdB4tbV7Jm18g0RefMEBG3CfHXwsA=; b=EP3CkNappbbCsSIFhq5TC3qZ6YsXLeP6TumaRBvrIOVezkMPlO9Av5KmcL3JC4rrGNpdw3 DINdkpTK4V0z+WDx4PIuUG7DQLwsUkU2vW3uPjiEKKYhhDeQfEAY6hvnYrs5gJr0OqXOGH B5aZbhji2E3HLcBncc6GmktGzceOLzk= X-MC-Unique: oXORVx7WPg6kd6buYQCEgw-1 X-Mimecast-MFC-AGG-ID: oXORVx7WPg6kd6buYQCEgw_1749559081 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , "Michael S. Tsirkin" , Peter Maydell , qemu-block@nongnu.org, Stefan Hajnoczi , Kevin Wolf , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 18/31] hw/misc/aspeed_hace: skip automatic zero-init of large array Date: Tue, 10 Jun 2025 13:36:56 +0100 Message-ID: <20250610123709.835102-19-berrange@redhat.com> In-Reply-To: <20250610123709.835102-1-berrange@redhat.com> References: <20250610123709.835102-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1749559441607116600 The 'do_hash_operation' method has a 256 element iovec array used for holding pointers to data that is to be hashed. Skip the automatic zero-init of this array to eliminate the performance overhead in the I/O hot path. The 'iovec' array will be selectively initialized based on data that needs to be hashed. Signed-off-by: Daniel P. Berrang=C3=A9 --- hw/misc/aspeed_hace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c index 8924a30eff..726368fbbc 100644 --- a/hw/misc/aspeed_hace.c +++ b/hw/misc/aspeed_hace.c @@ -419,7 +419,7 @@ static void hash_execute_acc_mode(AspeedHACEState *s, i= nt algo, static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode, bool acc_mode) { - struct iovec iov[ASPEED_HACE_MAX_SG]; + QEMU_UNINITIALIZED struct iovec iov[ASPEED_HACE_MAX_SG]; bool acc_final_request =3D false; int iov_idx =3D -1; =20 --=20 2.49.0