From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5CA3C3E8C5 for ; Wed, 18 Nov 2020 18:03:28 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1188C22210 for ; Wed, 18 Nov 2020 18:03:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b="ZN3ixbJl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1188C22210 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=icloud.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:58014 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kfRnh-00030q-SE for qemu-devel@archiver.kernel.org; Wed, 18 Nov 2020 13:03:25 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:49060) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kfRhm-00010H-Ac for qemu-devel@nongnu.org; Wed, 18 Nov 2020 12:57:18 -0500 Received: from pv50p00im-hyfv10011601.me.com ([17.58.6.43]:44735) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kfRhf-0007QS-JT for qemu-devel@nongnu.org; Wed, 18 Nov 2020 12:57:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; t=1605722230; bh=yxE1WgBJWz5FE/H9pCCWCdHfoW3SGKj+KnCSj90fxJc=; h=Content-Type:From:Mime-Version:Subject:Date:Message-Id:To; b=ZN3ixbJl9o0pK73/CnpNexIfvYohZEa8ng6atHkc2n8bmSjqbsCFgFOHp95O03fPd WWQCYH1TXTDJZEEgRFKRJw2652bejBmF8NPocfzghDQX1Ka72l5qrBoeEIQnacXQv1 4BHAnLvmJhheN5quZd3xICDq7c7oVqMxoPQ6MbXIgR0o51lGKKc7Ik1gQFWeRJGCyC ZjfwOV8BiBAuA7YHH/+2J7Rrrd+bTRinL+GltVgB7AW+S9g0yLNKCXvqFmDRQbBe5B wPn5w19vxEqAkElvkLDlk8ZBFQOumcmNQf7Alp8TYNT+DfMtRFrIkn0dX2a18YWZ6d 0Pqpyj8y6LdpQ== Received: from [192.168.50.83] (unknown [223.167.5.82]) by pv50p00im-hyfv10011601.me.com (Postfix) with ESMTPSA id 7EFB7380668; Wed, 18 Nov 2020 17:57:09 +0000 (UTC) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: =?utf-8?B?5rKI5qKm5aej?= Mime-Version: 1.0 (1.0) Subject: Re: How to copy data between guest memory and host Date: Thu, 19 Nov 2020 01:57:06 +0800 Message-Id: <300A9993-BB43-48CC-8AC2-2FAB29B8D266@icloud.com> References: <831379F2-6346-41E8-A019-39EB596086BA@icloud.com> In-Reply-To: <831379F2-6346-41E8-A019-39EB596086BA@icloud.com> To: qemu-discuss@nongnu.org, QEMU Developers X-Mailer: iPhone Mail (17H35) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-18_06:2020-11-17, 2020-11-18 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-2006250000 definitions=main-2011180126 Received-SPF: pass client-ip=17.58.6.43; envelope-from=shen.mengjiao3@icloud.com; helo=pv50p00im-hyfv10011601.me.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/18 12:57:10 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" By the way, I=E2=80=99m using TCG mode. Thanks > =E5=9C=A8 2020=E5=B9=B411=E6=9C=8818=E6=97=A5=EF=BC=8C=E4=B8=8B=E5=8D=883:= 44=EF=BC=8C=E6=B2=88=E6=A2=A6=E5=A7=A3 =E5=86=99= =E9=81=93=EF=BC=9A >=20 > =EF=BB=BFHi, > I=E2=80=99m adding device for one platform(e.g. mps2), and also writing dr= iver for that device on guest os. There is a buffer allocated in qemu where s= ome data will be cooked, and driver will update buffer address located in gu= est memory space to qemu device. So the question is how to copy data between= the two different memory space? >=20 > Thanks a lot! >=20 >=20