[RFC PATCH 2/6] vhost-vdpa: use bind_mm device callback
From: Stefano Garzarella <sgarzare@redhat.com>
Date: 2022-12-14 16:31:31
Also in:
kvm, lkml, virtualization
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
When the user call VHOST_SET_OWNER ioctl and the vDPA device has `use_va` set to true, let's call the bind_mm callback. In this way we can bind the device to the user address space and directly use the user VA. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> --- drivers/vhost/vdpa.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index b08e07fc7d1f..a775d1a52c77 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c@@ -219,6 +219,17 @@ static int vhost_vdpa_reset(struct vhost_vdpa *v) return vdpa_reset(vdpa); } +static long vhost_vdpa_bind_mm(struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (!vdpa->use_va || !ops->bind_mm) + return 0; + + return ops->bind_mm(vdpa, v->vdev.mm, current); +} + static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) { struct vdpa_device *vdpa = v->vdpa;
@@ -276,6 +287,10 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) ret = vdpa_reset(vdpa); if (ret) return ret; + + ret = vhost_vdpa_bind_mm(v); + if (ret) + return ret; } else vdpa_set_status(vdpa, status);
@@ -679,6 +694,13 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, break; default: r = vhost_dev_ioctl(&v->vdev, cmd, argp); + if (!r && cmd == VHOST_SET_OWNER) { + r = vhost_vdpa_bind_mm(v); + if (r) { + vhost_dev_reset_owner(&v->vdev, NULL); + break; + } + } if (r == -ENOIOCTLCMD) r = vhost_vdpa_vring_ioctl(v, cmd, argp); break;
--
2.38.1