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Tue, 7 Dec 2021 21:00:18 +0000 (GMT) From: Matthew Rosato To: linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 28/32] vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support Date: Tue, 7 Dec 2021 15:57:39 -0500 Message-Id: <20211207205743.150299-29-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211207205743.150299-1-mjrosato@linux.ibm.com> References: <20211207205743.150299-1-mjrosato@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: TYKRkfZRWExElVdH_oPIP8dbxYPz7iTg X-Proofpoint-GUID: Ar1PRKZ7XxW7GxzLsbc7WUUMHSEO7R2d X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-07_08,2021-12-06_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 priorityscore=1501 suspectscore=0 impostorscore=0 clxscore=1015 mlxlogscore=999 lowpriorityscore=0 adultscore=0 mlxscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112070126 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Introduce support for VFIO_DEVICE_FEATURE_ZPCI_AIF, which is a new VFIO_DEVICE_FEATURE ioctl. This interface is used to indicate that an s390x vfio-pci device wishes to enable/disable zPCI adapter interrupt forwarding, which allows underlying firmware to deliver interrupts directly to the associated kvm guest. Signed-off-by: Matthew Rosato --- arch/s390/include/asm/kvm_pci.h | 2 + drivers/vfio/pci/vfio_pci_core.c | 2 + drivers/vfio/pci/vfio_pci_zdev.c | 96 +++++++++++++++++++++++++++++++- include/linux/vfio_pci_core.h | 10 ++++ include/uapi/linux/vfio.h | 7 +++ include/uapi/linux/vfio_zdev.h | 20 +++++++ 6 files changed, 136 insertions(+), 1 deletion(-) diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h index 062bac720428..0a0e42e1db1c 100644 --- a/arch/s390/include/asm/kvm_pci.h +++ b/arch/s390/include/asm/kvm_pci.h @@ -36,6 +36,8 @@ struct kvm_zdev { struct zpci_fib fib; struct notifier_block nb; bool interp; + bool aif; + bool fhost; }; extern int kvm_s390_pci_dev_open(struct zpci_dev *zdev); diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 2b2d64a2190c..01658de660bd 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -1174,6 +1174,8 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd, return 0; case VFIO_DEVICE_FEATURE_ZPCI_INTERP: return vfio_pci_zdev_feat_interp(vdev, feature, arg); + case VFIO_DEVICE_FEATURE_ZPCI_AIF: + return vfio_pci_zdev_feat_aif(vdev, feature, arg); default: return -ENOTTY; } diff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c index b205e0ad1fd3..dd98808b9139 100644 --- a/drivers/vfio/pci/vfio_pci_zdev.c +++ b/drivers/vfio/pci/vfio_pci_zdev.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -206,6 +207,97 @@ int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev, return rc; } +int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev, + struct vfio_device_feature feature, + unsigned long arg) +{ + struct zpci_dev *zdev = to_zpci(vdev->pdev); + struct vfio_device_zpci_aif *data; + struct vfio_device_feature *feat; + unsigned long minsz; + int size, rc = 0; + + if (!zdev || !zdev->kzdev) + return -EINVAL; + + /* + * If PROBE requested and feature not found, leave immediately. + * Otherwise, keep going as GET or SET may also be specified. + */ + if (feature.flags & VFIO_DEVICE_FEATURE_PROBE) { + rc = kvm_s390_pci_aif_probe(zdev); + if (rc) + return rc; + } + if (!(feature.flags & (VFIO_DEVICE_FEATURE_GET + + VFIO_DEVICE_FEATURE_SET))) + return 0; + + size = sizeof(*feat) + sizeof(*data); + feat = kzalloc(size, GFP_KERNEL); + if (!feat) + return -ENOMEM; + + data = (struct vfio_device_zpci_aif *)&feat->data; + minsz = offsetofend(struct vfio_device_feature, flags); + + /* Get the rest of the payload for GET/SET */ + rc = copy_from_user(data, (void __user *)(arg + minsz), + sizeof(*data)); + if (rc) + rc = -EINVAL; + + if (feature.flags & VFIO_DEVICE_FEATURE_GET) { + if (zdev->kzdev->aif) + data->flags = VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT; + if (zdev->kzdev->fhost) + data->flags |= VFIO_DEVICE_ZPCI_FLAG_AIF_HOST; + + if (copy_to_user((void __user *)arg, feat, size)) + rc = -EFAULT; + } else if (feature.flags & VFIO_DEVICE_FEATURE_SET) { + if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT) { + /* create a guest fib */ + struct zpci_fib fib; + + fib.fmt0.aibv = data->ibv; + fib.fmt0.isc = data->isc; + fib.fmt0.noi = data->noi; + if (data->sb != 0) { + fib.fmt0.aisb = data->sb; + fib.fmt0.aisbo = data->sbo; + fib.fmt0.sum = 1; + } else { + fib.fmt0.aisb = 0; + fib.fmt0.aisbo = 0; + fib.fmt0.sum = 0; + } + if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_HOST) { + rc = kvm_s390_pci_aif_enable(zdev, &fib, false); + if (!rc) { + zdev->kzdev->aif = true; + zdev->kzdev->fhost = true; + } + } else { + rc = kvm_s390_pci_aif_enable(zdev, &fib, true); + if (!rc) + zdev->kzdev->aif = true; + } + } else if (data->flags == 0) { + rc = kvm_s390_pci_aif_disable(zdev); + if (!rc) { + zdev->kzdev->aif = false; + zdev->kzdev->fhost = false; + } + } else { + rc = -EINVAL; + } + } + + kfree(feat); + return rc; +} + static int vfio_pci_zdev_group_notifier(struct notifier_block *nb, unsigned long action, void *data) { @@ -259,8 +351,10 @@ int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev) * If the device was using interpretation, don't trust that userspace * did the appropriate cleanup */ - if (zdev->gd != 0) + if (zdev->gd != 0) { + kvm_s390_pci_aif_disable(zdev); kvm_s390_pci_interp_disable(zdev); + } kvm_s390_pci_dev_release(zdev); diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index 92dc43c827c9..5442d3fa1662 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -201,6 +201,9 @@ extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev, int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev, struct vfio_device_feature feature, unsigned long arg); +int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev, + struct vfio_device_feature feature, + unsigned long arg); int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev); int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev); #else @@ -217,6 +220,13 @@ static inline int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev, return -ENOTTY; } +static inline int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev, + struct vfio_device_feature feature, + unsigned long arg) +{ + return -ENOTTY; +} + static inline int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev) { return -ENODEV; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index b9a75485b8e7..fe3bfd99bf50 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -1009,6 +1009,13 @@ struct vfio_device_feature { */ #define VFIO_DEVICE_FEATURE_ZPCI_INTERP (1) +/* + * Provide support for enbaling adapter interruption forwarding for zPCI + * devices. This feature is only valid for s390x PCI devices. Data provided + * when setting and getting this feature is further described in vfio_zdev.h + */ +#define VFIO_DEVICE_FEATURE_ZPCI_AIF (2) + /* -------- API for Type1 VFIO IOMMU -------- */ /** diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h index 575f0410dc66..c574e23f9385 100644 --- a/include/uapi/linux/vfio_zdev.h +++ b/include/uapi/linux/vfio_zdev.h @@ -90,4 +90,24 @@ struct vfio_device_zpci_interp { __u32 fh; /* Host device function handle */ }; +/** + * VFIO_DEVICE_FEATURE_ZPCI_AIF + * + * This feature is used for enabling forwarding of adapter interrupts directly + * from firmware to the guest. When setting this feature, the flags indicate + * whether to enable/disable the feature and the structure defined below is + * used to setup the forwarding structures. When getting this feature, only + * the flags are used to indicate the current state. + */ +struct vfio_device_zpci_aif { + __u64 flags; +#define VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT 1 +#define VFIO_DEVICE_ZPCI_FLAG_AIF_HOST 2 + __u64 ibv; /* Address of guest interrupt bit vector */ + __u64 sb; /* Address of guest summary bit */ + __u32 noi; /* Number of interrupts */ + __u8 isc; /* Guest interrupt subclass */ + __u8 sbo; /* Offset of guest summary bit vector */ +}; + #endif