From nobody Wed Oct 29 20:43:06 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1525782774573385.6524106675806; Tue, 8 May 2018 05:32:54 -0700 (PDT) Received: from localhost ([::1]:50951 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fG1nY-0008Mz-Jj for importer@patchew.org; Tue, 08 May 2018 08:32:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40376) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fG1gZ-000413-Jx for qemu-devel@nongnu.org; Tue, 08 May 2018 08:25:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fG1gX-0006zX-Vp for qemu-devel@nongnu.org; Tue, 08 May 2018 08:25:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:38162 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fG1gX-0006zP-Pi for qemu-devel@nongnu.org; Tue, 08 May 2018 08:25:37 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w48CPZRg089075 for ; Tue, 8 May 2018 08:25:37 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2hua5kwfa6-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 08 May 2018 08:25:35 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 8 May 2018 08:25:19 -0400 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w48CPIxp50856080; Tue, 8 May 2018 12:25:18 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B701124044; Tue, 8 May 2018 09:27:15 -0400 (EDT) Received: from localhost.localdomain (unknown [9.80.200.252]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTPS id 22AE112403D; Tue, 8 May 2018 09:27:14 -0400 (EDT) From: Tony Krowiak To: qemu-devel@nongnu.org Date: Tue, 8 May 2018 08:25:01 -0400 X-Mailer: git-send-email 1.7.1 In-Reply-To: <1525782303-16940-1-git-send-email-akrowiak@linux.vnet.ibm.com> References: <1525782303-16940-1-git-send-email-akrowiak@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18050812-0008-0000-0000-000003047117 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008992; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000259; SDB=6.01029283; UDB=6.00525931; IPR=6.00808416; MB=3.00020992; MTD=3.00000008; XFM=3.00000015; UTC=2018-05-08 12:25:22 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18050812-0009-0000-0000-0000392CC583 Message-Id: <1525782303-16940-5-git-send-email-akrowiak@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-08_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=4 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1805080120 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v5 4/6] s390x/vfio: ap: Introduce VFIO AP device X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mjrosato@linux.vnet.ibm.com, peter.maydell@linaro.org, pasic@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, eskultet@redhat.com, david@redhat.com, pmorel@linux.vnet.ibm.com, cohuck@redhat.com, heiko.carstens@de.ibm.com, alex.williamson@redhat.com, agraf@suse.de, borntraeger@de.ibm.com, qemu-s390x@nongnu.org, akrowiak@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, schwidefsky@de.ibm.com, pbonzini@redhat.com, bjsdjshi@linux.vnet.ibm.com, eric.auger@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Introduces a VFIO based AP device. The device is defined via the QEMU command line by specifying: -device vfio-ap,sysfsdev=3D There may be only one vfio-ap device configured for a guest. The mediated matrix device is created by the VFIO AP device driver by writing a UUID to a sysfs attribute file (see docs/vfio-ap.txt). The mediated matrix device will be named after the UUID. Symbolic links to the $uuid are created in many places, so the path to the mediated matrix device $uuid can be specified in any of the following ways: /sys/devices/vfio_ap/matrix/$uuid /sys/devices/vfio_ap/matrix/mdev_supported_types/vfio_ap-passthrough/device= s/$uuid /sys/bus/mdev/devices/$uuid /sys/bus/mdev/drivers/vfio_mdev/$uuid When the vfio-ap device is realized, it acquires and opens the VFIO iommu group to which the mediated matrix device is bound. This causes a VFIO group notification event to be signaled. The vfio_ap device driver's group notification handler will get called at which time the device driver will configure the the AP devices to which the guest will be granted access. Signed-off-by: Tony Krowiak --- default-configs/s390x-softmmu.mak | 1 + hw/vfio/Makefile.objs | 1 + hw/vfio/ap.c | 182 +++++++++++++++++++++++++++++++++= ++++ include/hw/vfio/vfio-common.h | 1 + 4 files changed, 185 insertions(+), 0 deletions(-) create mode 100644 hw/vfio/ap.c diff --git a/default-configs/s390x-softmmu.mak b/default-configs/s390x-soft= mmu.mak index 2f4bfe7..0b784b6 100644 --- a/default-configs/s390x-softmmu.mak +++ b/default-configs/s390x-softmmu.mak @@ -9,3 +9,4 @@ CONFIG_S390_FLIC=3Dy CONFIG_S390_FLIC_KVM=3D$(CONFIG_KVM) CONFIG_VFIO_CCW=3D$(CONFIG_LINUX) CONFIG_WDT_DIAG288=3Dy +CONFIG_VFIO_AP=3D$(CONFIG_LINUX) diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs index a2e7a0a..8b3f664 100644 --- a/hw/vfio/Makefile.objs +++ b/hw/vfio/Makefile.objs @@ -6,4 +6,5 @@ obj-$(CONFIG_SOFTMMU) +=3D platform.o obj-$(CONFIG_VFIO_XGMAC) +=3D calxeda-xgmac.o obj-$(CONFIG_VFIO_AMD_XGBE) +=3D amd-xgbe.o obj-$(CONFIG_SOFTMMU) +=3D spapr.o +obj-$(CONFIG_VFIO_AP) +=3D ap.o endif diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c new file mode 100644 index 0000000..54a51aa --- /dev/null +++ b/hw/vfio/ap.c @@ -0,0 +1,182 @@ +/* + * VFIO based AP matrix device assignment + * + * Copyright 2018 IBM Corp. + * Author(s): Tony Krowiak + * + * 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 +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "hw/sysbus.h" +#include "hw/vfio/vfio.h" +#include "hw/vfio/vfio-common.h" +#include "hw/s390x/ap-device.h" +#include "qemu/error-report.h" +#include "qemu/queue.h" +#include "qemu/option.h" +#include "qemu/config-file.h" +#include "cpu.h" +#include "kvm_s390x.h" +#include "sysemu/sysemu.h" + +#define VFIO_AP_DEVICE_TYPE "vfio-ap" + +typedef struct VFIOAPDevice { + APDevice apdev; + VFIODevice vdev; + QTAILQ_ENTRY(VFIOAPDevice) sibling; +} VFIOAPDevice; + +VFIOAPDevice *vfio_apdev; + +static void vfio_ap_compute_needs_reset(VFIODevice *vdev) +{ + vdev->needs_reset =3D false; +} + +/* + * We don't need vfio_hot_reset_multi and vfio_eoi operations for + * vfio-ap-matrix device now. + */ +struct VFIODeviceOps vfio_ap_ops =3D { + .vfio_compute_needs_reset =3D vfio_ap_compute_needs_reset, +}; + +static void vfio_ap_put_device(VFIOAPDevice *vapdev) +{ + g_free(vapdev->vdev.name); + vfio_put_base_device(&vapdev->vdev); +} + +static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp) +{ + char *tmp, group_path[PATH_MAX]; + ssize_t len; + int groupid; + + tmp =3D g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev); + len =3D readlink(tmp, group_path, sizeof(group_path)); + g_free(tmp); + + if (len <=3D 0 || len >=3D sizeof(group_path)) { + error_setg(errp, "%s: no iommu_group found for %s", + VFIO_AP_DEVICE_TYPE, vapdev->vdev.sysfsdev); + return NULL; + } + + group_path[len] =3D 0; + + if (sscanf(basename(group_path), "%d", &groupid) !=3D 1) { + error_setg(errp, "vfio: failed to read %s", group_path); + return NULL; + } + + return vfio_get_group(groupid, &address_space_memory, errp); +} + +static void vfio_ap_realize(DeviceState *dev, Error **errp) +{ + VFIOGroup *vfio_group; + APDevice *apdev =3D DO_UPCAST(APDevice, parent_obj, dev); + char *mdevid; + Error *local_err =3D NULL; + int ret; + + /* + * Since a guest's matrix is configured in its entirety by the mediated + * matrix device and hot plug is not currently supported, there is no + * need to have more than one vfio-ap device. Check if a vfio-ap device + * has already been defined. + */ + if (vfio_apdev) { + error_setg(&local_err, "Only one %s device is allowed", + VFIO_AP_DEVICE_TYPE); + goto out_err; + } + + if (!s390_has_feat(S390_FEAT_AP)) { + error_setg(&local_err, "AP support not enabled"); + goto out_err; + } + + vfio_apdev =3D DO_UPCAST(VFIOAPDevice, apdev, apdev); + + vfio_group =3D vfio_ap_get_group(vfio_apdev, &local_err); + if (!vfio_group) { + goto out_err; + } + + vfio_apdev->vdev.ops =3D &vfio_ap_ops; + vfio_apdev->vdev.type =3D VFIO_DEVICE_TYPE_AP; + mdevid =3D basename(vfio_apdev->vdev.sysfsdev); + vfio_apdev->vdev.name =3D g_strdup_printf("%s", mdevid); + vfio_apdev->vdev.dev =3D dev; + + ret =3D vfio_get_device(vfio_group, mdevid, &vfio_apdev->vdev, &local_= err); + if (ret) { + goto out_get_dev_err; + } + + return; + +out_get_dev_err: + vfio_ap_put_device(vfio_apdev); + vfio_put_group(vfio_group); +out_err: + vfio_apdev =3D NULL; + error_propagate(errp, local_err); +} + +static void vfio_ap_unrealize(DeviceState *dev, Error **errp) +{ + APDevice *apdev =3D DO_UPCAST(APDevice, parent_obj, dev); + VFIOAPDevice *vapdev =3D DO_UPCAST(VFIOAPDevice, apdev, apdev); + VFIOGroup *group =3D vapdev->vdev.group; + + vfio_ap_put_device(vapdev); + vfio_put_group(group); + vfio_apdev =3D NULL; +} + +static Property vfio_ap_properties[] =3D { + DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev), + DEFINE_PROP_END_OF_LIST(), +}; + +static const VMStateDescription vfio_ap_vmstate =3D { + .name =3D VFIO_AP_DEVICE_TYPE, + .unmigratable =3D 1, +}; + +static void vfio_ap_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + + dc->props =3D vfio_ap_properties; + dc->vmsd =3D &vfio_ap_vmstate; + dc->desc =3D "VFIO-based AP device assignment"; + dc->realize =3D vfio_ap_realize; + dc->unrealize =3D vfio_ap_unrealize; + dc->hotpluggable =3D false; +} + +static const TypeInfo vfio_ap_info =3D { + .name =3D VFIO_AP_DEVICE_TYPE, + .parent =3D AP_DEVICE_TYPE, + .instance_size =3D sizeof(VFIOAPDevice), + .class_init =3D vfio_ap_class_init, +}; + +static void vfio_ap_type_init(void) +{ + type_register_static(&vfio_ap_info); + vfio_apdev =3D NULL; +} + +type_init(vfio_ap_type_init) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index d936014..f29df6e 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -47,6 +47,7 @@ enum { VFIO_DEVICE_TYPE_PCI =3D 0, VFIO_DEVICE_TYPE_PLATFORM =3D 1, VFIO_DEVICE_TYPE_CCW =3D 2, + VFIO_DEVICE_TYPE_AP =3D 3, }; =20 typedef struct VFIOMmap { --=20 1.7.1