From nobody Mon Feb 9 04:03:30 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=linux.ibm.com ARC-Seal: i=1; a=rsa-sha256; t=1769530691; cv=none; d=zohomail.com; s=zohoarc; b=cbl6ZAWqu4g8u+vV4KsE4ULKrHVh3enp0CiJGUmhfGQDI/LZjRBALyvJKlbkV48SJ7t0oJ7pfxpShjJyy1DrwAEbtrVXwVZryeTrru2OM6LtSMGwTXm7mkwHryEVQWqsGveFieBh917AoRbsV1HNTekuD6Xj4+KBtUrohkFJuns= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1769530691; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=DDqv+noGIHtgstu0OEOWoeoQguY3mAQLlYASF9Q4otI=; b=KKGyjVBHzmWlI9F7pijCflEOpV35z36xZc//Jr2+SzqUvKZXorpDu83hrKJk5ql1CQ71Q/SbVFdeLIr37kQ59SjEDLegsfsS/vO0UrBkbcxc50rgDaTwecKd8m4epgg/o9KUiQbypwjzjcvKHkIbDkuYft9ACgHHJ7tV+Drigag= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1769530691676769.7518825772156; Tue, 27 Jan 2026 08:18:11 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vklkF-0003uX-62; Tue, 27 Jan 2026 11:16:47 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vkljd-0003Z1-SB; Tue, 27 Jan 2026 11:16:12 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vklja-0000lE-Ph; Tue, 27 Jan 2026 11:16:09 -0500 Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 60R825h8030265; Tue, 27 Jan 2026 16:16:05 GMT Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4bvnt7pcy4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 16:16:04 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 60RDWo50019844; Tue, 27 Jan 2026 16:16:03 GMT Received: from smtprelay05.wdc07v.mail.ibm.com ([172.16.1.72]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4bw9dn1b46-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 16:16:03 +0000 Received: from smtpav03.wdc07v.mail.ibm.com (smtpav03.wdc07v.mail.ibm.com [10.39.53.230]) by smtprelay05.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 60RGG2Uc27263632 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 27 Jan 2026 16:16:02 GMT Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 60D255805A; Tue, 27 Jan 2026 16:16:02 +0000 (GMT) Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2C77158054; Tue, 27 Jan 2026 16:16:01 +0000 (GMT) Received: from t15.ibmuc.com (unknown [9.61.94.134]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 27 Jan 2026 16:16:01 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=DDqv+noGIHtgstu0O EOWoeoQguY3mAQLlYASF9Q4otI=; b=USEYVWMZA74G1QMKyH4QdGSnhbpdDkkmt oUV23EblnAZ1nluAcy+Y5KHeK3gfikzuZYNgNYCBLm3V6K8R4U7yqYd557TkSgDU jBDCO3fWeUOATuq3s2BP9ODPccGk8YtsRxb2SIBqMfTXKxX1CQTxs8Gnut9t8OXm hDaDhadJLgu7rXHUj1t9pVCJK3VnqxjA6mTgODzrB318l9qDJdhvti126vtKV8nl XcI2PqQmUjWv2kOznlJxfz55RQjEBLpWmXBkEf+YnCGGZcTpX8tgrxWvpcAaw0xs JGN5ihQD6FrV6cyOJVa+gYr8DC5ZiXRF9FKwoHmrUJCeTTuhO/IZw== From: jrossi@linux.ibm.com To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org, thuth@redhat.com, mst@redhat.com Cc: jjherne@linux.ibm.com, alifm@linux.ibm.com, farman@linux.ibm.com, mjrosato@linux.ibm.com, jrossi@linux.ibm.com, zycai@linux.ibm.com Subject: [PATCH v3 05/14] pc-bios/s390-ccw: Split virtio-ccw and generic virtio Date: Tue, 27 Jan 2026 11:15:38 -0500 Message-ID: <20260127161547.459443-6-jrossi@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20260127161547.459443-1-jrossi@linux.ibm.com> References: <20260127161547.459443-1-jrossi@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rbXZ7Ce8w9WTAJUUTMcoSczbLy8BAcgw X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyOSBTYWx0ZWRfXywMuCUr6KKZK bKWwzzpcZJpTMWqlNPYyx9fs7EvK9dmlTbQwKVREi8lsugWE9cqXz72RdLGEjsptOXqHjJjul1i dqoWHKRGfJQusPsh1gOASkm4PIMTCfS8qhMpUsKEC7+q3w0bbfBvfdon0aRVhB8G4zRhqAwz38J zonQzgevodRB7/8lVCQ5fjxKL/hfe3hXXJjj5v6i/U9idwGS8+GYC5iWisThBlDXVeUlWEJ+ljT qo1onjTOJnf0IiwEFY1ZNzI+qbZepQ4rIX7T/UoMPIPdzto9bNxkD9O26xpelZJFScDtxXwNSUu dyOHNpm2lj12trOU+oaeFPv7bHOrlrskUKyvJoaLZJpipF4/cWO6gmkFgrsZSdANmp1Tbq6ac15 5XBnD/ALbJWRvufDCj3h8MJYzVeJ9+jUIxUWKx4IrihkcFe9KTppjO6UMOmIovpiTcNZE0T0QtF kiV0TkqCSMVF61t94sQ== X-Authority-Analysis: v=2.4 cv=Zs3g6t7G c=1 sm=1 tr=0 ts=6978e4c5 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=ctsVLiZ_AAAA:8 a=J5HRprwtwPFiPHPCACwA:9 a=3VCIHQLkQthbvTRuo98s:22 X-Proofpoint-ORIG-GUID: rbXZ7Ce8w9WTAJUUTMcoSczbLy8BAcgw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-27_03,2026-01-27_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 adultscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270129 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=jrossi@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1769530693965154100 Content-Type: text/plain; charset="utf-8" From: Jared Rossi Separate the CCW specific virtio routines and create generic wrappers for e= asier reuse of existing virtio functions with non-CCW devices. Signed-off-by: Jared Rossi --- pc-bios/s390-ccw/Makefile | 3 +- pc-bios/s390-ccw/main.c | 8 +- pc-bios/s390-ccw/netmain.c | 2 +- pc-bios/s390-ccw/s390-ccw.h | 3 - pc-bios/s390-ccw/virtio-blkdev.c | 13 +- pc-bios/s390-ccw/virtio-ccw.c | 241 +++++++++++++++++++++++++++++++ pc-bios/s390-ccw/virtio-ccw.h | 24 +++ pc-bios/s390-ccw/virtio-net.c | 3 +- pc-bios/s390-ccw/virtio-scsi.c | 6 +- pc-bios/s390-ccw/virtio-scsi.h | 2 +- pc-bios/s390-ccw/virtio.c | 239 +++++------------------------- pc-bios/s390-ccw/virtio.h | 5 +- 12 files changed, 332 insertions(+), 217 deletions(-) create mode 100644 pc-bios/s390-ccw/virtio-ccw.c create mode 100644 pc-bios/s390-ccw/virtio-ccw.h diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile index a0f24c94a8..259cff09db 100644 --- a/pc-bios/s390-ccw/Makefile +++ b/pc-bios/s390-ccw/Makefile @@ -34,7 +34,8 @@ QEMU_DGFLAGS =3D -MMD -MP -MT $@ -MF $(@D)/$(*F).d .PHONY : all clean build-all distclean =20 OBJECTS =3D start.o main.o bootmap.o jump2ipl.o sclp.o menu.o netmain.o \ - virtio.o virtio-net.o virtio-scsi.o virtio-blkdev.o cio.o dasd-ipl.o + virtio.o virtio-net.o virtio-scsi.o virtio-blkdev.o cio.o dasd-ipl.o \ + virtio-ccw.o =20 SLOF_DIR :=3D $(SRC_PATH)/../../roms/SLOF =20 diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index e7c3d9b2d6..2ffce743bd 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -71,6 +71,7 @@ static int is_dev_possibly_bootable(int dev_no, int sch_n= o) bool is_virtio; Schib schib; int r; + VDev *vdev =3D virtio_get_device(); =20 blk_schid.sch_no =3D sch_no; r =3D stsch_err(blk_schid, &schib); @@ -91,7 +92,8 @@ static int is_dev_possibly_bootable(int dev_no, int sch_n= o) * Note: we always have to run virtio_is_supported() here to make * sure that the vdev.senseid data gets pre-initialized correctly */ - is_virtio =3D virtio_is_supported(blk_schid); + vdev->schid =3D blk_schid; + is_virtio =3D virtio_is_supported(vdev); =20 /* No specific devno given, just return whether the device is possibly= bootable */ if (dev_no < 0) { @@ -255,10 +257,10 @@ static int virtio_setup(void) puts("Network boot device detected"); return 0; case VIRTIO_ID_BLOCK: - ret =3D virtio_blk_setup_device(blk_schid); + ret =3D virtio_blk_setup_device(); break; case VIRTIO_ID_SCSI: - ret =3D virtio_scsi_setup_device(blk_schid); + ret =3D virtio_scsi_setup_device(); break; default: puts("\n! No IPL device available !\n"); diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c index a9521dff41..651cedf6ef 100644 --- a/pc-bios/s390-ccw/netmain.c +++ b/pc-bios/s390-ccw/netmain.c @@ -500,7 +500,7 @@ static bool find_net_dev(Schib *schib, int dev_no) continue; } enable_subchannel(net_schid); - if (!virtio_is_supported(net_schid)) { + if (!virtio_is_supported(virtio_get_device())) { continue; } if (virtio_get_device_type() !=3D VIRTIO_ID_NET) { diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index 47ea66bd4d..ccd68ff0a4 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -66,9 +66,6 @@ void sclp_setup(void); void sclp_get_loadparm_ascii(char *loadparm); int sclp_read(char *str, size_t count); =20 -/* virtio.c */ -bool virtio_is_supported(SubChannelId schid); - /* bootmap.c */ void zipl_load(void); =20 diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blk= dev.c index 9cc40e9108..e14bcf0382 100644 --- a/pc-bios/s390-ccw/virtio-blkdev.c +++ b/pc-bios/s390-ccw/virtio-blkdev.c @@ -12,6 +12,7 @@ #include "s390-ccw.h" #include "virtio.h" #include "virtio-scsi.h" +#include "virtio-ccw.h" =20 #define VIRTIO_BLK_F_GEOMETRY (1 << 4) #define VIRTIO_BLK_F_BLK_SIZE (1 << 6) @@ -229,15 +230,19 @@ uint64_t virtio_get_blocks(void) } } =20 -int virtio_blk_setup_device(SubChannelId schid) +int virtio_blk_setup_device(void) { VDev *vdev =3D virtio_get_device(); =20 vdev->guest_features[0] =3D VIRTIO_BLK_F_GEOMETRY | VIRTIO_BLK_F_BLK_S= IZE; - vdev->schid =3D schid; - virtio_setup_ccw(vdev); =20 puts("Using virtio-blk."); =20 - return 0; + switch (vdev->ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + return virtio_ccw_setup(vdev); + default: + return 1; + } } diff --git a/pc-bios/s390-ccw/virtio-ccw.c b/pc-bios/s390-ccw/virtio-ccw.c new file mode 100644 index 0000000000..ab98da90c3 --- /dev/null +++ b/pc-bios/s390-ccw/virtio-ccw.c @@ -0,0 +1,241 @@ +/* + * Virtio functionality for CCW devices + * + * Copyright (c) 2013 Alexander Graf + * Copyright 2025 IBM Corp. + * + * Author(s): Jared Rossi + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include +#include "s390-ccw.h" +#include "cio.h" +#include "virtio.h" +#include "virtio-ccw.h" +#include "virtio-scsi.h" +#include "bswap.h" +#include "helper.h" +#include "s390-time.h" + +/* virtio spec v1.0 para 4.3.3.2 */ +static long kvm_hypercall(unsigned long nr, unsigned long param1, + unsigned long param2, unsigned long param3) +{ + register unsigned long r_nr asm("1") =3D nr; + register unsigned long r_param1 asm("2") =3D param1; + register unsigned long r_param2 asm("3") =3D param2; + register unsigned long r_param3 asm("4") =3D param3; + register long retval asm("2"); + + asm volatile ("diag %%r2,%%r4,0x500" + : "=3Dd" (retval) + : "d" (r_nr), "0" (r_param1), "r"(r_param2), "d"(r_param= 3) + : "memory", "cc"); + + return retval; +} + +static int run_ccw(VDev *vdev, int cmd, void *ptr, int len, bool sli) +{ + Ccw1 ccw =3D {}; + + ccw.cmd_code =3D cmd; + ccw.cda =3D (long)ptr; + ccw.count =3D len; + + if (sli) { + ccw.flags |=3D CCW_FLAG_SLI; + } + + return do_cio(vdev->schid, vdev->senseid.cu_type, ptr2u32(&ccw), CCW_F= MT1); +} + +bool virtio_ccw_is_supported(VDev *vdev) +{ + memset(&vdev->senseid, 0, sizeof(vdev->senseid)); + + /* + * Run sense id command. + * The size of the senseid data differs between devices (notably, + * between virtio devices and dasds), so specify the largest possible + * size and suppress the incorrect length indication for smaller sizes. + */ + if (run_ccw(vdev, CCW_CMD_SENSE_ID, &vdev->senseid, sizeof(vdev->sense= id), + true)) { + return false; + } + + vdev->dev_type =3D vdev->senseid.cu_model; + + if (vdev->senseid.cu_type =3D=3D 0x3832) { + switch (vdev->dev_type) { + case VIRTIO_ID_BLOCK: + case VIRTIO_ID_SCSI: + case VIRTIO_ID_NET: + return true; + default: + return false; + } + } + return false; +} + +int drain_irqs_ccw(SubChannelId schid) +{ + Irb irb =3D {}; + int r =3D 0; + + while (1) { + /* FIXME: make use of TPI, for that enable subchannel and isc */ + if (tsch(schid, &irb)) { + /* Might want to differentiate error codes later on. */ + if (irb.scsw.cstat) { + r =3D -EIO; + } else if (irb.scsw.dstat !=3D 0xc) { + r =3D -EIO; + } + return r; + } + } +} + +long virtio_ccw_notify(SubChannelId schid, int vq_idx, long cookie) +{ + return kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, + vq_idx, cookie); +} + +int virtio_ccw_run(VDev *vdev, int vqid, VirtioCmd *cmd) +{ + VRing *vr =3D &vdev->vrings[vqid]; + int i =3D 0; + + do { + vring_send_buf(vr, cmd[i].data, cmd[i].size, + cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0)); + } while (cmd[i++].flags & VRING_DESC_F_NEXT); + + vring_wait_reply(); + if (drain_irqs()) { + return -1; + } + return 0; +} + +int virtio_ccw_reset(VDev *vdev) +{ + return run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false); +} + +int virtio_ccw_setup(VDev *vdev) +{ + int i, cfg_size =3D 0; + uint8_t status; + struct VirtioFeatureDesc { + uint32_t features; + uint8_t index; + } __attribute__((packed)) feats; + + if (!virtio_ccw_is_supported(vdev)) { + puts("Virtio unsupported for this device ID"); + return -ENODEV; + } + /* device ID has been established now */ + + vdev->config.blk.blk_size =3D 0; /* mark "illegal" - setup started... = */ + vdev->guessed_disk_nature =3D VIRTIO_GDN_NONE; + + virtio_reset(vdev); + + status =3D VIRTIO_CONFIG_S_ACKNOWLEDGE; + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { + puts("Could not write ACKNOWLEDGE status to host"); + return -EIO; + } + + switch (vdev->dev_type) { + case VIRTIO_ID_NET: + vdev->nr_vqs =3D 2; + vdev->cmd_vr_idx =3D 0; + cfg_size =3D sizeof(vdev->config.net); + break; + case VIRTIO_ID_BLOCK: + vdev->nr_vqs =3D 1; + vdev->cmd_vr_idx =3D 0; + cfg_size =3D sizeof(vdev->config.blk); + break; + case VIRTIO_ID_SCSI: + vdev->nr_vqs =3D 3; + vdev->cmd_vr_idx =3D VR_REQUEST; + cfg_size =3D sizeof(vdev->config.scsi); + break; + default: + puts("Unsupported virtio device"); + return -ENODEV; + } + + status |=3D VIRTIO_CONFIG_S_DRIVER; + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { + puts("Could not write DRIVER status to host"); + return -EIO; + } + + /* Feature negotiation */ + for (i =3D 0; i < ARRAY_SIZE(vdev->guest_features); i++) { + feats.features =3D 0; + feats.index =3D i; + if (run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats), false)= ) { + puts("Could not get features bits"); + return -EIO; + } + + vdev->guest_features[i] &=3D bswap32(feats.features); + feats.features =3D bswap32(vdev->guest_features[i]); + if (run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats), false= )) { + puts("Could not set features bits"); + return -EIO; + } + } + + if (run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false)) { + puts("Could not get virtio device configuration"); + return -EIO; + } + + for (i =3D 0; i < vdev->nr_vqs; i++) { + VqInfo info =3D { + .queue =3D (unsigned long long) virtio_get_ring_area(i), + .align =3D KVM_S390_VIRTIO_RING_ALIGN, + .index =3D i, + .num =3D 0, + }; + VqConfig config =3D { + .index =3D i, + .num =3D 0, + }; + + if (run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config), + false)) { + puts("Could not get virtio device VQ config"); + return -EIO; + } + info.num =3D config.num; + vring_init(&vdev->vrings[i], &info); + if (run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false)) { + puts("Cannot set VQ info"); + return -EIO; + } + } + + status |=3D VIRTIO_CONFIG_S_DRIVER_OK; + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { + puts("Could not write DRIVER_OK status to host"); + return -EIO; + } + + return 0; +} diff --git a/pc-bios/s390-ccw/virtio-ccw.h b/pc-bios/s390-ccw/virtio-ccw.h new file mode 100644 index 0000000000..a506767eaa --- /dev/null +++ b/pc-bios/s390-ccw/virtio-ccw.h @@ -0,0 +1,24 @@ +/* + * Virtio definitions for CCW devices + * + * Copyright 2025 IBM Corp. + * Author(s): Jared Rossi + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef VIRTIO_CCW_H +#define VIRTIO_CCW_H + +/* main.c */ +extern SubChannelId blk_schid; + +/* virtio-ccw.c */ +int drain_irqs_ccw(SubChannelId schid); +bool virtio_ccw_is_supported(VDev *vdev); +int virtio_ccw_run(VDev *vdev, int vqid, VirtioCmd *cmd); +long virtio_ccw_notify(SubChannelId schid, int vq_idx, long cookie); +int virtio_ccw_setup(VDev *vdev); +int virtio_ccw_reset(VDev *vdev); + +#endif diff --git a/pc-bios/s390-ccw/virtio-net.c b/pc-bios/s390-ccw/virtio-net.c index 7eb0850069..f58f7ffc55 100644 --- a/pc-bios/s390-ccw/virtio-net.c +++ b/pc-bios/s390-ccw/virtio-net.c @@ -19,6 +19,7 @@ #include #include "s390-ccw.h" #include "virtio.h" +#include "virtio-ccw.h" #include "s390-time.h" #include "helper.h" =20 @@ -54,7 +55,7 @@ int virtio_net_init(void *mac_addr) rx_last_idx =3D 0; =20 vdev->guest_features[0] =3D VIRTIO_NET_F_MAC_BIT; - virtio_setup_ccw(vdev); + virtio_ccw_setup(vdev); =20 if (!(vdev->guest_features[0] & VIRTIO_NET_F_MAC_BIT)) { puts("virtio-net device does not support the MAC address feature"); diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c index 71db75ce7b..6ab0f755f2 100644 --- a/pc-bios/s390-ccw/virtio-scsi.c +++ b/pc-bios/s390-ccw/virtio-scsi.c @@ -15,6 +15,7 @@ #include "virtio.h" #include "scsi.h" #include "virtio-scsi.h" +#include "virtio-ccw.h" #include "s390-time.h" #include "helper.h" =20 @@ -476,12 +477,11 @@ static int virtio_scsi_setup(VDev *vdev) return 0; } =20 -int virtio_scsi_setup_device(SubChannelId schid) +int virtio_scsi_setup_device(void) { VDev *vdev =3D virtio_get_device(); =20 - vdev->schid =3D schid; - virtio_setup_ccw(vdev); + virtio_ccw_setup(vdev); =20 if (vdev->config.scsi.sense_size !=3D VIRTIO_SCSI_SENSE_SIZE) { puts("Config: sense size mismatch"); diff --git a/pc-bios/s390-ccw/virtio-scsi.h b/pc-bios/s390-ccw/virtio-scsi.h index c5612e16a2..7a37f8b45a 100644 --- a/pc-bios/s390-ccw/virtio-scsi.h +++ b/pc-bios/s390-ccw/virtio-scsi.h @@ -69,6 +69,6 @@ static inline bool virtio_scsi_response_ok(const VirtioSc= siCmdResp *r) =20 int virtio_scsi_read_many(VDev *vdev, unsigned long sector, void *load_addr, int sec_n= um); -int virtio_scsi_setup_device(SubChannelId schid); +int virtio_scsi_setup_device(void); =20 #endif /* VIRTIO_SCSI_H */ diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 5dd407d5c9..956b34ff33 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -2,6 +2,9 @@ * Virtio driver bits * * Copyright (c) 2013 Alexander Graf + * Copyright 2025 IBM Corp. + * + * Author(s): Jared Rossi * * This work is licensed under the terms of the GNU GPL, version 2 or (at * your option) any later version. See the COPYING file in the top-level @@ -13,6 +16,7 @@ #include "cio.h" #include "virtio.h" #include "virtio-scsi.h" +#include "virtio-ccw.h" #include "bswap.h" #include "helper.h" #include "s390-time.h" @@ -44,28 +48,9 @@ VirtioDevType virtio_get_device_type(void) return vdev.dev_type; } =20 -/* virtio spec v1.0 para 4.3.3.2 */ -static long kvm_hypercall(unsigned long nr, unsigned long param1, - unsigned long param2, unsigned long param3) +char *virtio_get_ring_area(int ring_num) { - register unsigned long r_nr asm("1") =3D nr; - register unsigned long r_param1 asm("2") =3D param1; - register unsigned long r_param2 asm("3") =3D param2; - register unsigned long r_param3 asm("4") =3D param3; - register long retval asm("2"); - - asm volatile ("diag %%r2,%%r4,0x500" - : "=3Dd" (retval) - : "d" (r_nr), "0" (r_param1), "r"(r_param2), "d"(r_param= 3) - : "memory", "cc"); - - return retval; -} - -static long virtio_notify(SubChannelId schid, int vq_idx, long cookie) -{ - return kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, - vq_idx, cookie); + return ring_area + ring_num * VIRTIO_RING_SIZE; } =20 /*********************************************** @@ -74,39 +59,27 @@ static long virtio_notify(SubChannelId schid, int vq_id= x, long cookie) =20 int drain_irqs(void) { - Irb irb =3D {}; - int r =3D 0; - - while (1) { - /* FIXME: make use of TPI, for that enable subchannel and isc */ - if (tsch(vdev.schid, &irb)) { - /* Might want to differentiate error codes later on. */ - if (irb.scsw.cstat) { - r =3D -EIO; - } else if (irb.scsw.dstat !=3D 0xc) { - r =3D -EIO; - } - return r; - } + switch (vdev.ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + return drain_irqs_ccw(vdev.schid); + default: + return 0; } } =20 -static int run_ccw(VDev *vdev, int cmd, void *ptr, int len, bool sli) +int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) { - Ccw1 ccw =3D {}; - - ccw.cmd_code =3D cmd; - ccw.cda =3D (long)ptr; - ccw.count =3D len; - - if (sli) { - ccw.flags |=3D CCW_FLAG_SLI; + switch (vdev->ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + return virtio_ccw_run(vdev, vqid, cmd); + default: + return -1; } - - return do_cio(vdev->schid, vdev->senseid.cu_type, ptr2u32(&ccw), CCW_F= MT1); } =20 -static void vring_init(VRing *vr, VqInfo *info) +void vring_init(VRing *vr, VqInfo *info) { void *p =3D (void *) info->queue; =20 @@ -134,7 +107,15 @@ static void vring_init(VRing *vr, VqInfo *info) =20 bool vring_notify(VRing *vr) { - vr->cookie =3D virtio_notify(vdev.schid, vr->id, vr->cookie); + switch (vdev.ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + vr->cookie =3D virtio_ccw_notify(vdev.schid, vr->id, vr->cookie); + break; + default: + return 1; + } + return vr->cookie >=3D 0; } =20 @@ -200,164 +181,24 @@ int vring_wait_reply(void) return 1; } =20 -int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) -{ - VRing *vr =3D &vdev->vrings[vqid]; - int i =3D 0; - - do { - vring_send_buf(vr, cmd[i].data, cmd[i].size, - cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0)); - } while (cmd[i++].flags & VRING_DESC_F_NEXT); - - vring_wait_reply(); - if (drain_irqs()) { - return -1; - } - return 0; -} - int virtio_reset(VDev *vdev) { - return run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false); -} - -int virtio_setup_ccw(VDev *vdev) -{ - int i, cfg_size =3D 0; - uint8_t status; - struct VirtioFeatureDesc { - uint32_t features; - uint8_t index; - } __attribute__((packed)) feats; - - if (!virtio_is_supported(vdev->schid)) { - puts("Virtio unsupported for this device ID"); - return -ENODEV; - } - /* device ID has been established now */ - - vdev->config.blk.blk_size =3D 0; /* mark "illegal" - setup started... = */ - vdev->guessed_disk_nature =3D VIRTIO_GDN_NONE; - - virtio_reset(vdev); - - status =3D VIRTIO_CONFIG_S_ACKNOWLEDGE; - if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { - puts("Could not write ACKNOWLEDGE status to host"); - return -EIO; - } - - switch (vdev->dev_type) { - case VIRTIO_ID_NET: - vdev->nr_vqs =3D 2; - vdev->cmd_vr_idx =3D 0; - cfg_size =3D sizeof(vdev->config.net); - break; - case VIRTIO_ID_BLOCK: - vdev->nr_vqs =3D 1; - vdev->cmd_vr_idx =3D 0; - cfg_size =3D sizeof(vdev->config.blk); - break; - case VIRTIO_ID_SCSI: - vdev->nr_vqs =3D 3; - vdev->cmd_vr_idx =3D VR_REQUEST; - cfg_size =3D sizeof(vdev->config.scsi); - break; + switch (vdev->ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + return virtio_ccw_reset(vdev); default: - puts("Unsupported virtio device"); - return -ENODEV; - } - - status |=3D VIRTIO_CONFIG_S_DRIVER; - if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { - puts("Could not write DRIVER status to host"); - return -EIO; - } - - /* Feature negotiation */ - for (i =3D 0; i < ARRAY_SIZE(vdev->guest_features); i++) { - feats.features =3D 0; - feats.index =3D i; - if (run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats), false)= ) { - puts("Could not get features bits"); - return -EIO; - } - - vdev->guest_features[i] &=3D bswap32(feats.features); - feats.features =3D bswap32(vdev->guest_features[i]); - if (run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats), false= )) { - puts("Could not set features bits"); - return -EIO; - } - } - - if (run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false)) { - puts("Could not get virtio device configuration"); - return -EIO; - } - - for (i =3D 0; i < vdev->nr_vqs; i++) { - VqInfo info =3D { - .queue =3D (unsigned long long) ring_area + (i * VIRTIO_RING_S= IZE), - .align =3D KVM_S390_VIRTIO_RING_ALIGN, - .index =3D i, - .num =3D 0, - }; - VqConfig config =3D { - .index =3D i, - .num =3D 0, - }; - - if (run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config), - false)) { - puts("Could not get virtio device VQ config"); - return -EIO; - } - info.num =3D config.num; - vring_init(&vdev->vrings[i], &info); - if (run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false)) { - puts("Cannot set VQ info"); - return -EIO; - } - } - - status |=3D VIRTIO_CONFIG_S_DRIVER_OK; - if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false= )) { - puts("Could not write DRIVER_OK status to host"); - return -EIO; + return -1; } - - return 0; } =20 -bool virtio_is_supported(SubChannelId schid) +bool virtio_is_supported(VDev *vdev) { - vdev.schid =3D schid; - memset(&vdev.senseid, 0, sizeof(vdev.senseid)); - - /* - * Run sense id command. - * The size of the senseid data differs between devices (notably, - * between virtio devices and dasds), so specify the largest possible - * size and suppress the incorrect length indication for smaller sizes. - */ - if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.sensei= d), - true)) { + switch (vdev->ipl_type) { + case S390_IPL_TYPE_QEMU_SCSI: + case S390_IPL_TYPE_CCW: + return virtio_ccw_is_supported(vdev); + default: return false; } - - vdev.dev_type =3D vdev.senseid.cu_model; - - if (vdev.senseid.cu_type =3D=3D 0x3832) { - switch (vdev.dev_type) { - case VIRTIO_ID_BLOCK: - case VIRTIO_ID_SCSI: - case VIRTIO_ID_NET: - return true; - default: - return false; - } - } - return false; } diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h index 39b507b221..0fdee8468c 100644 --- a/pc-bios/s390-ccw/virtio.h +++ b/pc-bios/s390-ccw/virtio.h @@ -108,6 +108,7 @@ struct VRing { }; typedef struct VRing VRing; =20 +char *virtio_get_ring_area(int ring_num); =20 /*********************************************** * Virtio block * @@ -269,6 +270,8 @@ struct VirtioCmd { }; typedef struct VirtioCmd VirtioCmd; =20 +void vring_init(VRing *vr, VqInfo *info); +bool virtio_is_supported(VDev *vdev); bool vring_notify(VRing *vr); int drain_irqs(void); void vring_send_buf(VRing *vr, void *p, int len, int flags); @@ -283,7 +286,7 @@ int virtio_net_init(void *mac_addr); void virtio_net_deinit(void); =20 /* virtio-blkdev.c */ -int virtio_blk_setup_device(SubChannelId schid); +int virtio_blk_setup_device(void); int virtio_read(unsigned long sector, void *load_addr); unsigned long virtio_load_direct(unsigned long rec_list1, unsigned long re= c_list2, void *load_addr); --=20 2.52.0