Re: [PATCH v3 3/4] vfio: Add VFIO_DEVICE_PASID_[AT|DE]TACH_IOMMUFD_PT

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On 2024/10/14 23:49, Alex Williamson wrote:
On Sat, 12 Oct 2024 21:49:05 +0800
Yi Liu <yi.l.liu@xxxxxxxxx> wrote:

On 2024/10/1 20:11, Jason Gunthorpe wrote:
On Mon, Sep 30, 2024 at 07:55:08AM +0000, Tian, Kevin wrote:
+struct vfio_device_pasid_attach_iommufd_pt {
+	__u32	argsz;
+	__u32	flags;
+	__u32	pasid;
+	__u32	pt_id;
+};
+
+#define VFIO_DEVICE_PASID_ATTACH_IOMMUFD_PT	_IO(VFIO_TYPE,
VFIO_BASE + 21)

Not sure whether this was discussed before. Does it make sense
to reuse the existing VFIO_DEVICE_ATTACH_IOMMUFD_PT
by introducing a new pasid field and a new flag bit?

Maybe? I don't have a strong feeling either way.

There is somewhat less code if you reuse the ioctl at least

I had a rough memory that I was suggested to add a separate ioctl for
PASID. Let's see Alex's opinion.

I don't recall any previous arguments for separate ioctls, but it seems
to make a lot of sense to me to extend the existing ioctls with a flag
to indicate pasid cscope and id.  Thanks,

thanks for the confirmation. How about the below?

diff --git a/drivers/vfio/device_cdev.c b/drivers/vfio/device_cdev.c
index bb1817bd4ff3..c78533bce3c6 100644
--- a/drivers/vfio/device_cdev.c
+++ b/drivers/vfio/device_cdev.c
@@ -162,21 +162,34 @@ void vfio_df_unbind_iommufd(struct vfio_device_file *df)
 int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
 			    struct vfio_device_attach_iommufd_pt __user *arg)
 {
-	struct vfio_device *device = df->device;
+	unsigned long minsz = offsetofend(
+			struct vfio_device_attach_iommufd_pt, pt_id);
 	struct vfio_device_attach_iommufd_pt attach;
-	unsigned long minsz;
+	struct vfio_device *device = df->device;
+	u32 user_size;
 	int ret;

-	minsz = offsetofend(struct vfio_device_attach_iommufd_pt, pt_id);
+	ret = get_user(user_size, (u32 __user *)arg);
+	if (ret)
+		return ret;

-	if (copy_from_user(&attach, arg, minsz))
-		return -EFAULT;
+	ret = copy_struct_from_user(&attach, sizeof(attach), arg, user_size);
+	if (ret)
+		return ret;

-	if (attach.argsz < minsz || attach.flags)
+	if (attach.argsz < minsz || attach.flags & (~VFIO_DEVICE_ATTACH_PASID))
 		return -EINVAL;

+	if ((attach.flags & VFIO_DEVICE_ATTACH_PASID) &&
+	    !device->ops->pasid_attach_ioas)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&device->dev_set->lock);
-	ret = device->ops->attach_ioas(device, &attach.pt_id);
+	if (attach.flags & VFIO_DEVICE_ATTACH_PASID)
+		ret = device->ops->pasid_attach_ioas(device, attach.pasid,
+						     &attach.pt_id);
+	else
+		ret = device->ops->attach_ioas(device, &attach.pt_id);
 	if (ret)
 		goto out_unlock;

@@ -198,20 +211,33 @@ int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
 int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
 			    struct vfio_device_detach_iommufd_pt __user *arg)
 {
-	struct vfio_device *device = df->device;
+	unsigned long minsz =
+		offsetofend(struct vfio_device_detach_iommufd_pt, flags);
 	struct vfio_device_detach_iommufd_pt detach;
-	unsigned long minsz;
+	struct vfio_device *device = df->device;
+	u32 user_size;
+	int ret;

-	minsz = offsetofend(struct vfio_device_detach_iommufd_pt, flags);
+	ret = get_user(user_size, (u32 __user *)arg);
+	if (ret)
+		return ret;

-	if (copy_from_user(&detach, arg, minsz))
-		return -EFAULT;
+	ret = copy_struct_from_user(&detach, sizeof(detach), arg, user_size);
+	if (ret)
+		return ret;

-	if (detach.argsz < minsz || detach.flags)
+	if (detach.argsz < minsz || detach.flags & (~VFIO_DEVICE_DETACH_PASID))
 		return -EINVAL;

+	if ((detach.flags & VFIO_DEVICE_DETACH_PASID) &&
+	    !device->ops->pasid_detach_ioas)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&device->dev_set->lock);
-	device->ops->detach_ioas(device);
+	if (detach.flags & VFIO_DEVICE_DETACH_PASID)
+		device->ops->pasid_detach_ioas(device, detach.pasid);
+	else
+		device->ops->detach_ioas(device);
 	mutex_unlock(&device->dev_set->lock);

 	return 0;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 2b68e6cdf190..40b414e642f5 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -931,29 +931,34 @@ struct vfio_device_bind_iommufd {
  * VFIO_DEVICE_ATTACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 19,
  *					struct vfio_device_attach_iommufd_pt)
  * @argsz:	User filled size of this data.
- * @flags:	Must be 0.
+ * @flags:	Flags for attach.
  * @pt_id:	Input the target id which can represent an ioas or a hwpt
  *		allocated via iommufd subsystem.
  *		Output the input ioas id or the attached hwpt id which could
  *		be the specified hwpt itself or a hwpt automatically created
  *		for the specified ioas by kernel during the attachment.
+ * @pasid:	The pasid to be attached, only meaningful when
+ *		VFIO_DEVICE_ATTACH_PASID is set in @flags
  *
  * Associate the device with an address space within the bound iommufd.
  * Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close.  This is only
  * allowed on cdev fds.
  *
- * If a vfio device is currently attached to a valid hw_pagetable, without doing - * a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl - * passing in another hw_pagetable (hwpt) id is allowed. This action, also known
- * as a hw_pagetable replacement, will replace the device's currently attached
- * hw_pagetable with a new hw_pagetable corresponding to the given pt_id.
+ * If a vfio device or a pasid of this device is currently attached to a valid
+ * hw_pagetable (hwpt), without doing a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second
+ * VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl passing in another hwpt id is allowed.
+ * This action, also known as a hw_pagetable replacement, will replace the
+ * currently attached hwpt of the device or the pasid of this device with a new
+ * hwpt corresponding to the given pt_id.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_attach_iommufd_pt {
 	__u32	argsz;
 	__u32	flags;
+#define VFIO_DEVICE_ATTACH_PASID	(1 << 0)
 	__u32	pt_id;
+	__u32	pasid;
 };

 #define VFIO_DEVICE_ATTACH_IOMMUFD_PT		_IO(VFIO_TYPE, VFIO_BASE + 19)
@@ -962,17 +967,21 @@ struct vfio_device_attach_iommufd_pt {
  * VFIO_DEVICE_DETACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 20,
  *					struct vfio_device_detach_iommufd_pt)
  * @argsz:	User filled size of this data.
- * @flags:	Must be 0.
+ * @flags:	Flags for detach.
+ * @pasid:	The pasid to be detached, only meaningful when
+ *		VFIO_DEVICE_DETACH_PASID is set in @flags
  *
- * Remove the association of the device and its current associated address
- * space. After it, the device should be in a blocking DMA state. This is only
- * allowed on cdev fds.
+ * Remove the association of the device or a pasid of the device and its current
+ * associated address space.  After it, the device or the pasid should be in a
+ * blocking DMA state.  This is only allowed on cdev fds.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_detach_iommufd_pt {
 	__u32	argsz;
 	__u32	flags;
+#define VFIO_DEVICE_DETACH_PASID	(1 << 0)
+	__u32	pasid;
 };

 #define VFIO_DEVICE_DETACH_IOMMUFD_PT		_IO(VFIO_TYPE, VFIO_BASE + 20)
--
2.34.1


--
Regards,
Yi Liu




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