[RFC v3 06/21] vfio: VFIO_IOMMU_BIND_MSI

[Eric Auger <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

This patch adds the VFIO_IOMMU_BIND_MSI ioctl which aims at
passing the guest MSI binding to the host.

Signed-off-by: Eric Auger <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

---

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 | 27 +++++++++++++++++++++++++++
 include/uapi/linux/vfio.h       |  7 +++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index c3ba3f249438..59229f6e2d84 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1673,6 +1673,15 @@ static int vfio_cache_inv_fn(struct device *dev, void *data)
 	return iommu_cache_invalidate(d, dev, &ustruct->info);
 }
 
+static int vfio_bind_guest_msi_fn(struct device *dev, void *data)
+{
+	struct vfio_iommu_type1_bind_guest_msi *ustruct =
+		(struct vfio_iommu_type1_bind_guest_msi *)data;
+	struct iommu_domain *d = iommu_get_domain_for_dev(dev);
+
+	return iommu_bind_guest_msi(d, dev, &ustruct->binding);
+}
+
 static int
 vfio_set_pasid_table(struct vfio_iommu *iommu,
 		      struct vfio_iommu_type1_set_pasid_table *ustruct)
@@ -1792,6 +1801,24 @@ 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_guest_msi ustruct;
+		int ret;
+
+		minsz = offsetofend(struct vfio_iommu_type1_bind_guest_msi,
+				    binding);
+
+		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_guest_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 11a07165e7e1..352e795a93c8 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -774,6 +774,13 @@ struct vfio_iommu_type1_cache_invalidate {
 };
 #define VFIO_IOMMU_CACHE_INVALIDATE      _IO(VFIO_TYPE, VFIO_BASE + 23)
 
+struct vfio_iommu_type1_bind_guest_msi {
+	__u32   argsz;
+	__u32   flags;
+	struct iommu_guest_msi_binding binding;
+};
+#define VFIO_IOMMU_BIND_MSI      _IO(VFIO_TYPE, VFIO_BASE + 24)
+
 /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
 
 /*
-- 
2.17.2