From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Auger Subject: [PATCH v4 09/22] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Date: Mon, 18 Feb 2019 14:54:50 +0100 Message-ID: <20190218135504.25048-10-eric.auger@redhat.com> References: <20190218135504.25048-1-eric.auger@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190218135504.25048-1-eric.auger@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: eric.auger.pro@gmail.com, eric.auger@redhat.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, joro@8bytes.org, alex.williamson@redhat.com, jacob.jun.pan@linux.intel.com, yi.l.liu@linux.intel.com, jean-philippe.brucker@arm.com, will.deacon@arm.com, robin.murphy@arm.com Cc: marc.zyngier@arm.com, kevin.tian@intel.com, ashok.raj@intel.com List-Id: iommu@lists.linux-foundation.org This patch adds the VFIO_IOMMU_BIND/UNBIND_MSI ioctl which aim to pass/withdraw the guest MSI binding to/from the host. Signed-off-by: Eric Auger --- v3 -> v4: - add UNBIND - unwind on BIND error v2 -> v3: - adapt to new proto of bind_guest_msi - directly use vfio_iommu_for_each_dev v1 -> v2: - s/vfio_iommu_type1_guest_msi_binding/vfio_iommu_type1_bind_guest_msi --- drivers/vfio/vfio_iommu_type1.c | 58 +++++++++++++++++++++++++++++++++ include/uapi/linux/vfio.h | 29 +++++++++++++++++ 2 files changed, 87 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 12a40b9db6aa..66513679081b 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -1710,6 +1710,25 @@ static int vfio_cache_inv_fn(struct device *dev, void *data) return iommu_cache_invalidate(d, dev, &ustruct->info); } +static int vfio_bind_msi_fn(struct device *dev, void *data) +{ + struct vfio_iommu_type1_bind_msi *ustruct = + (struct vfio_iommu_type1_bind_msi *)data; + struct iommu_domain *d = iommu_get_domain_for_dev(dev); + + return iommu_bind_guest_msi(d, dev, ustruct->iova, + ustruct->gpa, ustruct->size); +} + +static int vfio_unbind_msi_fn(struct device *dev, void *data) +{ + dma_addr_t *iova = (dma_addr_t *)data; + struct iommu_domain *d = iommu_get_domain_for_dev(dev); + + iommu_unbind_guest_msi(d, dev, *iova); + return 0; +} + static long vfio_iommu_type1_ioctl(void *iommu_data, unsigned int cmd, unsigned long arg) { @@ -1814,6 +1833,45 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, vfio_cache_inv_fn); mutex_unlock(&iommu->lock); return ret; + } else if (cmd == VFIO_IOMMU_BIND_MSI) { + struct vfio_iommu_type1_bind_msi ustruct; + int ret; + + minsz = offsetofend(struct vfio_iommu_type1_bind_msi, + size); + + if (copy_from_user(&ustruct, (void __user *)arg, minsz)) + return -EFAULT; + + if (ustruct.argsz < minsz || ustruct.flags) + return -EINVAL; + + mutex_lock(&iommu->lock); + ret = vfio_iommu_for_each_dev(iommu, &ustruct, + vfio_bind_msi_fn); + if (ret) + vfio_iommu_for_each_dev(iommu, &ustruct.iova, + vfio_unbind_msi_fn); + mutex_unlock(&iommu->lock); + return ret; + } else if (cmd == VFIO_IOMMU_UNBIND_MSI) { + struct vfio_iommu_type1_unbind_msi ustruct; + int ret; + + minsz = offsetofend(struct vfio_iommu_type1_unbind_msi, + iova); + + if (copy_from_user(&ustruct, (void __user *)arg, minsz)) + return -EFAULT; + + if (ustruct.argsz < minsz || ustruct.flags) + return -EINVAL; + + mutex_lock(&iommu->lock); + ret = vfio_iommu_for_each_dev(iommu, &ustruct.iova, + vfio_unbind_msi_fn); + mutex_unlock(&iommu->lock); + return ret; } return -ENOTTY; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 29f0ef2d805d..6763389b6adc 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -789,6 +789,35 @@ struct vfio_iommu_type1_cache_invalidate { }; #define VFIO_IOMMU_CACHE_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 24) +/** + * VFIO_IOMMU_BIND_MSI - _IOWR(VFIO_TYPE, VFIO_BASE + 25, + * struct vfio_iommu_type1_bind_msi) + * + * Pass a stage 1 MSI doorbell mapping to the host so that this + * latter can build a nested stage2 mapping + */ +struct vfio_iommu_type1_bind_msi { + __u32 argsz; + __u32 flags; + __u64 iova; + __u64 gpa; + __u64 size; +}; +#define VFIO_IOMMU_BIND_MSI _IO(VFIO_TYPE, VFIO_BASE + 25) + +/** + * VFIO_IOMMU_UNBIND_MSI - _IOWR(VFIO_TYPE, VFIO_BASE + 26, + * struct vfio_iommu_type1_unbind_msi) + * + * Unregister an MSI mapping + */ +struct vfio_iommu_type1_unbind_msi { + __u32 argsz; + __u32 flags; + __u64 iova; +}; +#define VFIO_IOMMU_UNBIND_MSI _IO(VFIO_TYPE, VFIO_BASE + 26) + /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ /* -- 2.20.1