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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 C3BCEC10F13 for ; Tue, 16 Apr 2019 11:10:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9134220873 for ; Tue, 16 Apr 2019 11:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728147AbfDPLKP (ORCPT ); Tue, 16 Apr 2019 07:10:15 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:43326 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727164AbfDPLKP (ORCPT ); Tue, 16 Apr 2019 07:10:15 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3GB7dhL074660 for ; Tue, 16 Apr 2019 07:10:14 -0400 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rwd88hxjq-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 16 Apr 2019 07:10:13 -0400 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 16 Apr 2019 12:10:08 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3GBA7Qv46661760 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 16 Apr 2019 11:10:07 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 15259A405F; Tue, 16 Apr 2019 11:10:07 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 84B91A4051; Tue, 16 Apr 2019 11:10:06 +0000 (GMT) Received: from oc2783563651 (unknown [9.152.224.66]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 16 Apr 2019 11:10:06 +0000 (GMT) Date: Tue, 16 Apr 2019 13:10:05 +0200 From: Halil Pasic To: David Hildenbrand Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, Cornelia Huck , Martin Schwidefsky , Sebastian Ott , virtualization@lists.linux-foundation.org, Christian Borntraeger , Viktor Mihajlovski , Vasily Gorbik , Janosch Frank , Claudio Imbrenda , Farhan Ali , Eric Farman Subject: Re: [RFC PATCH 00/12] s390: virtio: support protected virtualization In-Reply-To: References: <20190404231622.52531-1-pasic@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19041611-0020-0000-0000-0000033061B9 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19041611-0021-0000-0000-00002182A56F Message-Id: <20190416131005.6f3e05eb@oc2783563651> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-16_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904160075 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, 12 Apr 2019 15:47:50 +0200 David Hildenbrand wrote: > On 05.04.19 01:16, Halil Pasic wrote: > > Enhanced virtualization protection technology may require the use of > > bounce buffers for I/O. While support for this was built into the virtio > > core, virtio-ccw wasn't changed accordingly. > > Can you elaborate some more about the general approach (Enhanced > virtualization protection technology, ultravisor, concept, issues, how > to squeeze it into QEMU/KVM/kernel) etc = > > For my taste, this cover letter misses some important context :) > I'm aware. Unfortunately we don't have a decision yet about which parts of the protected virtualization architecture are going to be PoP material. You can get some more context immediately by having a look at Martin's features branch and looking at the s390/protvirt and s390/uv patches. I will try to provide more background information for v1. But having a remotely complete and reliable documentation will take some time. What I can offer at the moment is answers to specific questions. Regards, Halil