From patchwork Fri Feb 17 08:29:39 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dong Jia Shi X-Patchwork-Id: 9579185 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6913A6042F for ; Fri, 17 Feb 2017 08:30:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5CF7C2868A for ; Fri, 17 Feb 2017 08:30:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 519E7286AB; Fri, 17 Feb 2017 08:30:39 +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=-6.9 required=2.0 tests=BAYES_00,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 E43842868A for ; Fri, 17 Feb 2017 08:30:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933046AbdBQIag (ORCPT ); Fri, 17 Feb 2017 03:30:36 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:60110 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932976AbdBQIa1 (ORCPT ); Fri, 17 Feb 2017 03:30:27 -0500 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1H8T1F2076111 for ; Fri, 17 Feb 2017 03:30:26 -0500 Received: from e17.ny.us.ibm.com (e17.ny.us.ibm.com [129.33.205.207]) by mx0a-001b2d01.pphosted.com with ESMTP id 28nrnu1rsp-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 17 Feb 2017 03:30:26 -0500 Received: from localhost by e17.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 17 Feb 2017 03:30:21 -0500 Received: from b01cxnp23034.gho.pok.ibm.com (b01cxnp23034.gho.pok.ibm.com [9.57.198.29]) by d01dlp03.pok.ibm.com (Postfix) with ESMTP id D6008C90041; Fri, 17 Feb 2017 03:30:01 -0500 (EST) Received: from b01ledav03.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v1H8UKZk12845394; Fri, 17 Feb 2017 08:30:20 GMT Received: from b01ledav03.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 65CEBB204E; Fri, 17 Feb 2017 03:30:19 -0500 (EST) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by b01ledav03.gho.pok.ibm.com (Postfix) with ESMTP id 26466B2056; Fri, 17 Feb 2017 03:30:18 -0500 (EST) From: Dong Jia Shi To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, qemu-devel@nongnu.org Cc: bjsdjshi@linux.vnet.ibm.com, renxiaof@linux.vnet.ibm.com, cornelia.huck@de.ibm.com, borntraeger@de.ibm.com, agraf@suse.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, pasic@linux.vnet.ibm.com, wkywang@linux.vnet.ibm.com Subject: [PATCH RFC v3 15/15] vfio: ccw: introduce support for ccw0 Date: Fri, 17 Feb 2017 09:29:39 +0100 X-Mailer: git-send-email 2.8.4 In-Reply-To: <20170217082939.33208-1-bjsdjshi@linux.vnet.ibm.com> References: <20170217082939.33208-1-bjsdjshi@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17021708-0040-0000-0000-000002A6C624 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006631; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000203; SDB=6.00823158; UDB=6.00402782; IPR=6.00600604; BA=6.00005146; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00014319; XFM=3.00000011; UTC=2017-02-17 08:30:23 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17021708-0041-0000-0000-00000699E634 Message-Id: <20170217082939.33208-16-bjsdjshi@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-17_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702170081 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Although Linux does not use format-0 channel command words (CCW0) these are a non-optional part of the platform spec, and for the sake of platform compliance, and possibly some non-Linux guests, we have to support CCW0. Making the kernel execute a format 0 channel program is too much hassle because we would need to allocate and use memory which can be addressed by 24 bit physical addresses (because of CCW0.cda). So we implement CCW0 support by translating the channel program into an equivalent CCW1 program instead. Signed-off-by: Kai Yue Wang Signed-off-by: Dong Jia Shi --- arch/s390/Kconfig | 7 +++++ drivers/s390/cio/vfio_ccw_cp.c | 58 ++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 63 insertions(+), 2 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 32008b8..f25d077 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -680,6 +680,13 @@ config VFIO_CCW To compile this driver as a module, choose M here: the module will be called vfio_ccw. +config VFIO_CCW_CCW0 + def_bool n + prompt "Support for CCW0 translation" + depends on VFIO_CCW + help + Enable translation for CCW0 programs for VFIO-CCW subchannels. + endmenu menu "Dump support" diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index 16bbb54..b0a8bc05 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -15,6 +15,26 @@ #include "vfio_ccw_cp.h" +#ifdef CONFIG_VFIO_CCW_CCW0 +/** + * struct ccw0 - channel command word + * @cmd_code: command code + * @cda: data address + * @flags: flags, like IDA addressing, etc. + * @reserved: will be ignored + * @count: byte count + * + * The format-0 ccw structure. + */ +struct ccw0 { + __u8 cmd_code; + __u32 cda : 24; + __u8 flags; + __u8 reserved; + __u16 count; +} __packed __aligned(8); +#endif + /* * Max length for ccw chain. * XXX: Limit to 256, need to check more? @@ -243,12 +263,42 @@ static long copy_from_iova(struct device *mdev, return l; } +#ifdef CONFIG_VFIO_CCW_CCW0 +static long copy_ccw_from_iova(struct channel_program *cp, + struct ccw1 *to, u64 iova, + unsigned long len) +{ + struct ccw0 ccw0; + struct ccw1 *pccw1; + int ret; + int i; + + ret = copy_from_iova(cp->mdev, to, iova, len * sizeof(struct ccw1)); + if (ret) + return ret; + + if (!cp->orb.cmd.fmt) { + pccw1 = to; + for (i = 0; i < len; i++) { + ccw0 = *(struct ccw0 *)pccw1; + pccw1->cmd_code = ccw0.cmd_code; + pccw1->flags = ccw0.flags; + pccw1->count = ccw0.count; + pccw1->cda = ccw0.cda; + pccw1++; + } + } + + return ret; +} +#else static long copy_ccw_from_iova(struct channel_program *cp, struct ccw1 *to, u64 iova, unsigned long len) { return copy_from_iova(cp->mdev, to, iova, len * sizeof(struct ccw1)); } +#endif /* * Helpers to operate ccwchain. @@ -616,10 +666,14 @@ int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb) * Only support prefetch enable mode now. * Only support 64bit addressing idal. * Only support 4k IDAW. - * Only support ccw1. */ - if (!orb->cmd.pfch || !orb->cmd.c64 || orb->cmd.i2k || !orb->cmd.fmt) + if (!orb->cmd.pfch || !orb->cmd.c64 || orb->cmd.i2k) + return -EOPNOTSUPP; + +#ifndef CONFIG_VFIO_CCW_CCW0 + if (!orb->cmd.fmt) return -EOPNOTSUPP; +#endif INIT_LIST_HEAD(&cp->ccwchain_list); memcpy(&cp->orb, orb, sizeof(*orb));