From patchwork Mon Jan 21 11:05:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 10773603 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1CD881515 for ; Mon, 21 Jan 2019 11:05:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0D2B229E38 for ; Mon, 21 Jan 2019 11:05:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F37F729E3A; Mon, 21 Jan 2019 11:05:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9EA5E29E38 for ; Mon, 21 Jan 2019 11:05:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727835AbfAULFQ (ORCPT ); Mon, 21 Jan 2019 06:05:16 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48386 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727561AbfAULFQ (ORCPT ); Mon, 21 Jan 2019 06:05:16 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4890CC058CB1; Mon, 21 Jan 2019 11:05:16 +0000 (UTC) Received: from localhost (ovpn-116-178.ams2.redhat.com [10.36.116.178]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6E4236012D; Mon, 21 Jan 2019 11:05:12 +0000 (UTC) From: Cornelia Huck To: Halil Pasic , Eric Farman , Farhan Ali , Pierre Morel Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, qemu-s390x@nongnu.org, Alex Williamson , Cornelia Huck Subject: [PATCH v2 0/2] vfio-ccw: support hsch/csch (QEMU part) Date: Mon, 21 Jan 2019 12:05:06 +0100 Message-Id: <20190121110508.2320-1-cohuck@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 21 Jan 2019 11:05:16 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP [This is the QEMU part, git tree is available at https://github.com/cohuck/qemu vfio-ccw-caps The companion Linux kernel patches are available at https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw.git vfio-ccw-eagain-caps] Currently, vfio-ccw only relays START SUBCHANNEL requests to the real device. This tends to work well for the most common 'good path' scenarios; however, as we emulate {HALT,CLEAR} SUBCHANNEL in QEMU, things like clearing pending requests at the device is currently not supported. This may be a problem for e.g. error recovery. This patch series makes use of the newly introduced async command region to issue hsch/csch; if it is not present, continue to emulate hsch/csch, as before. Note that the kernel side now returns -EAGAIN to trigger a retry in more cases; QEMU should already be fine with that. [I'm not quite happy with how this async processing hooks up in css.c; ideas welcome.] Lightly tested (I can interact with a dasd as before, and reserve/release seems to work well.) Not sure if there is a better way to test this, ideas welcome. Changes v1->v2: - update kernel header to v2 of kernel patches - rebased on master Cornelia Huck (2): vfio-ccw: new capability chain support vfio-ccw: support async command subregion hw/s390x/css.c | 27 ++++++-- hw/vfio/ccw.c | 109 ++++++++++++++++++++++++++++++++- include/hw/s390x/s390-ccw.h | 3 + linux-headers/linux/vfio.h | 4 ++ linux-headers/linux/vfio_ccw.h | 12 ++++ 5 files changed, 149 insertions(+), 6 deletions(-)