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Thu, 25 Jun 2020 12:13:31 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 764A4AE04D; Thu, 25 Jun 2020 12:13:31 +0000 (GMT) Received: from oc2783563651 (unknown [9.145.188.218]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 25 Jun 2020 12:13:31 +0000 (GMT) Date: Thu, 25 Jun 2020 14:13:29 +0200 From: Halil Pasic To: Cornelia Huck Subject: Re: [RFC 0/4] Enable virtio-fs on s390x Message-ID: <20200625141329.6ca84e39.pasic@linux.ibm.com> In-Reply-To: <20200625121755.24940841.cohuck@redhat.com> References: <20200625100430.22407-1-mhartmay@linux.ibm.com> <20200625121755.24940841.cohuck@redhat.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: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-25_05:2020-06-25, 2020-06-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 cotscore=-2147483648 spamscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006250074 Received-SPF: pass client-ip=148.163.158.5; envelope-from=pasic@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 08:13:37 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: , Cc: "Daniel P. =?UTF-8?B?QmVycmFu?= =?UTF-8?B?Z8Op?=" , "Michael S. Tsirkin" , qemu-devel@nongnu.org, Marc Hartmayer , Stefan Hajnoczi , =?UTF-8?B?TWFyYy1BbmRyw6k=?= Lureau Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, 25 Jun 2020 12:17:55 +0200 Cornelia Huck wrote: > On Thu, 25 Jun 2020 12:04:26 +0200 > Marc Hartmayer wrote: > > > This RFC is about enabling virtio-fs on s390x. For that we need > > + some shim code (first patch), and we need > > + libvhost-user to deal with virtio endiannes as mandated by the spec. > > > > The second part is trickier, because unlike QEMU we are not certain > > about the guest's native endianness, which is needed to handle the > > legacy-interface appropriately. In fact, this is the reason why just > > RFC. > > > > One of the open questions is whether to build separate versions, one > > for guest little endian and one for guest big endian, or do we want > > something like a command line option? (Digression on the libvirt > > modeling) > > > > A third option would be to refuse legacy altogether. > > The third option looks the most tempting to me. It is a new device, so > I don't think there's much of a case to be made for pre-virtio-1 > support? > > Yes, virtio-fs is a new device, but libvhost-user is not specific to virtio-fs. Regards, Halil