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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 AA480C35247 for ; Mon, 3 Feb 2020 22:03:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74DEC2084E for ; Mon, 3 Feb 2020 22:03:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726474AbgBCWDv (ORCPT ); Mon, 3 Feb 2020 17:03:51 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:42512 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726278AbgBCWDv (ORCPT ); Mon, 3 Feb 2020 17:03:51 -0500 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 013Lsqvg096039 for ; Mon, 3 Feb 2020 17:03:50 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xxmkkyy80-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 03 Feb 2020 17:03:50 -0500 Received: from localhost by e06smtp03.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) Mon, 3 Feb 2020 22:03:44 -0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 013M3hah40829042 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 3 Feb 2020 22:03:43 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 47A2E11C052; Mon, 3 Feb 2020 22:03:43 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DC76F11C04C; Mon, 3 Feb 2020 22:03:42 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.178.76]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 3 Feb 2020 22:03:42 +0000 (GMT) Subject: Re: [RFCv2 02/37] s390/protvirt: introduce host side setup To: Cornelia Huck Cc: Janosch Frank , KVM , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , Andrea Arcangeli References: <20200203131957.383915-1-borntraeger@de.ibm.com> <20200203131957.383915-3-borntraeger@de.ibm.com> <20200203181238.7c7ea03b.cohuck@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20200203181238.7c7ea03b.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20020322-0012-0000-0000-000003835F9D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20020322-0013-0000-0000-000021BFC4B6 Message-Id: <0310f99f-6d1e-b1bb-9313-be2a92c601ba@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-03_07:2020-02-02,2020-02-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 clxscore=1015 malwarescore=0 mlxscore=0 adultscore=0 impostorscore=0 spamscore=0 suspectscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2002030156 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 03.02.20 18:12, Cornelia Huck wrote: > On Mon, 3 Feb 2020 08:19:22 -0500 > Christian Borntraeger wrote: > >> From: Vasily Gorbik >> >> Introduce KVM_S390_PROTECTED_VIRTUALIZATION_HOST kbuild option for >> protected virtual machines hosting support code. > > Hm... I seem to remember that you wanted to drop this config option and > always build the code, in order to reduce complexity. Have you > reconsidered this? I am still in favour of removing this, but I did not get an "yes, lets do it" answer. Since removing is easier than re-adding its still in. [...] >> + * Copyright IBM Corp. 2019 > > Happy new year? yep :-) [..] >> + >> +#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST >> +int __bootdata_preserved(prot_virt_guest); > > Confused. You have this and uv_info below both in this file and in > boot/uv.c. Is there some magic happening in __bootdata_preserved()? Yes, this is information that is transferred from the decompressor to Linux. I think we discussed about this the last time as well? > >> +#endif >> + >> +#ifdef CONFIG_KVM_S390_PROTECTED_VIRTUALIZATION_HOST >> +int prot_virt_host; >> +EXPORT_SYMBOL(prot_virt_host); >> +struct uv_info __bootdata_preserved(uv_info); >> +EXPORT_SYMBOL(uv_info); >> + >> +static int __init prot_virt_setup(char *val) >> +{ >> + bool enabled; >> + int rc; >> + >> + rc = kstrtobool(val, &enabled); >> + if (!rc && enabled) >> + prot_virt_host = 1; >> + >> + if (is_prot_virt_guest() && prot_virt_host) { >> + prot_virt_host = 0; >> + pr_info("Running as protected virtualization guest."); > > Trying to disentangle that a bit in my mind... > > If we don't have facility 158, is_prot_virt_guest() will return 0. If > protected host support has been requested, we'll print a message below > (and turn it off). yes, a guest cannot be a host. > > If the hardware provides the facilities for running as a protected virt > guest, we turn off protected virt host support if requested and print a > messages that we're a guest. > > Two questions: > - Can the hardware ever provide both host and guest interfaces at the > same time? I guess not; maybe add a comment? Right, you are either guest or host. > - Do we also want to print a message that we're running as a guest if > the user didn't enable host support? If not, maybe prefix the message > with "Cannot enable support for protected virtualization host:" or > so? (Maybe also a good idea for the message below.) Line too long and I hate breaking string over multiple lines. I can change if somebody comes up with a proper message that is not too long.