From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59389) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dq8c8-0001oz-OB for qemu-devel@nongnu.org; Thu, 07 Sep 2017 22:01:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dq8c4-00085s-2K for qemu-devel@nongnu.org; Thu, 07 Sep 2017 22:01:48 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:42412) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dq8c3-00085c-Pi for qemu-devel@nongnu.org; Thu, 07 Sep 2017 22:01:44 -0400 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v881wt7r127290 for ; Thu, 7 Sep 2017 22:01:41 -0400 Received: from e38.co.us.ibm.com (e38.co.us.ibm.com [32.97.110.159]) by mx0a-001b2d01.pphosted.com with ESMTP id 2cugwqb943-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 07 Sep 2017 22:01:41 -0400 Received: from localhost by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 7 Sep 2017 20:01:40 -0600 Date: Fri, 8 Sep 2017 10:01:34 +0800 From: Dong Jia Shi References: <20170905111645.18068-1-pasic@linux.vnet.ibm.com> <20170905111645.18068-6-pasic@linux.vnet.ibm.com> <20170906151821.1a77afe5.cohuck@redhat.com> <20170907073108.GD31680@bjsdjshi@linux.vnet.ibm.com> <20170907100817.08ddae29.cohuck@redhat.com> <20170907125220.0d78d285.cohuck@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170907125220.0d78d285.cohuck@redhat.com> Message-Id: <20170908020134.GG31680@bjsdjshi@linux.vnet.ibm.com> Subject: Re: [Qemu-devel] [PATCH 5/5] s390x/ccs: add ccw-tester emulated device List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Cornelia Huck Cc: Halil Pasic , Dong Jia Shi , Pierre Morel , qemu-devel@nongnu.org * Cornelia Huck [2017-09-07 12:52:20 +0200]: > On Thu, 7 Sep 2017 12:21:50 +0200 > Halil Pasic wrote: > > > On 09/07/2017 10:08 AM, Cornelia Huck wrote: > > > On Thu, 7 Sep 2017 15:31:09 +0800 > > > Dong Jia Shi wrote: > > > >> I'm thinking of a method these days: > > >> Could passing through an fully emulated ccw device (e.g. 3270), or a > > >> virtio ccw device, in the level 1 kvm guest to a level 2 guest be a test > > >> method for this? > > >> > > >> All of the CCWs will be translated to IDAL CCWs by vfio-ccw in the level > > >> 1 guest (which is the level 2 kvm host) and issued to the level 1 kvm > > >> host. So, those IDALs will eventually be handled by the emulated device, > > >> or the virtio ccw device, on the level 1 kvm host... > > >> > > >> Some days ago, one of my colleague tried the emulated 3270 passing > > >> through. She stucked with the problem that the level 1 kvm host handling > > >> a senseid IDAL ccw as a Direct ccw. > > >> > > >> Maybe I could try to pass through a virtio ccw device. I don't think of > > >> any obvious problem that would lead to fail. Any comment? > > >> > > > > > > That actually looks like a good thing to try! Cool idea. > > > > > > > I'm afraid that it would not work without some extra work. > > AFAIR Connie we said that the 3270 does not use any IDA, so > > I did not touch the 3270 emulation code in QEMU. To make > > the scenario viable one should convert the 3270 emulation > > to ccw data stream (unless the original implementation > > already took care of IDA, which I doubt). > > But the vfio-ccw code uses idals... no need to touch the 3270 emulation. > What Halil pointed out is that the ccw_cb implementation of 3270 emulation does not take care of IDALs. This is true. I can also do that right after this series, if Halil agrees. (The 3270 emulation authors are busy of other stuff these days. :() -- Dong Jia Shi