Re: [RFC 2/3] vdpa: support exposing the count of vqs to userspace

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在 2022/1/17 下午5:29, Longpeng(Mike) 写道:
From: Longpeng <longpeng2@xxxxxxxxxx>

- GET_VQS_COUNT: the count of virtqueues that exposed

Signed-off-by: Longpeng <longpeng2@xxxxxxxxxx>
---
  drivers/vhost/vdpa.c       | 13 +++++++++++++
  include/uapi/linux/vhost.h |  3 +++
  2 files changed, 16 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 1eea14a4ea56..c1074278fc6b 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -369,6 +369,16 @@ static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
  	return 0;
  }
+static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
+{
+	struct vdpa_device *vdpa = v->vdpa;


While at it, I think it's better to change vdpa->nvqs to use u32?

Thanks


+
+	if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
+		return -EFAULT;
+
+	return 0;
+}
+
  static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
  				   void __user *argp)
  {
@@ -509,6 +519,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
  	case VHOST_VDPA_GET_CONFIG_SIZE:
  		r = vhost_vdpa_get_config_size(v, argp);
  		break;
+	case VHOST_VDPA_GET_VQS_COUNT:
+		r = vhost_vdpa_get_vqs_count(v, argp);
+		break;
  	default:
  		r = vhost_dev_ioctl(&v->vdev, cmd, argp);
  		if (r == -ENOIOCTLCMD)
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index bc74e95a273a..5d99e7c242a2 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -154,4 +154,7 @@
  /* Get the config size */
  #define VHOST_VDPA_GET_CONFIG_SIZE	_IOR(VHOST_VIRTIO, 0x79, __u32)
+/* Get the count of all virtqueues */
+#define VHOST_VDPA_GET_VQS_COUNT	_IOR(VHOST_VIRTIO, 0x80, __u32)
+
  #endif

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