From 9067de4725a299bc1baf11de9f5040fdd0bd05c3 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Tue, 4 Apr 2023 15:13:19 +0200 Subject: vhost-vdpa: use bind_mm/unbind_mm device callbacks 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. The unbind_mm callback is called during the release after stopping the device. Signed-off-by: Stefano Garzarella Message-Id: <20230404131326.44403-3-sgarzare@redhat.com> Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vdpa.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'drivers/vhost/vdpa.c') diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 9cd878e25cff..cd266fa80c4e 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -219,6 +219,28 @@ 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); +} + +static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (!vdpa->use_va || !ops->unbind_mm) + return; + + ops->unbind_mm(vdpa); +} + static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) { struct vdpa_device *vdpa = v->vdpa; @@ -718,6 +740,17 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, break; } + if (r) + goto out; + + switch (cmd) { + case VHOST_SET_OWNER: + r = vhost_vdpa_bind_mm(v); + if (r) + vhost_dev_reset_owner(d, NULL); + break; + } +out: mutex_unlock(&d->mutex); return r; } @@ -1289,6 +1322,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) vhost_vdpa_clean_irq(v); vhost_vdpa_reset(v); vhost_dev_stop(&v->vdev); + vhost_vdpa_unbind_mm(v); vhost_vdpa_config_put(v); vhost_vdpa_cleanup(v); mutex_unlock(&d->mutex); -- cgit v1.2.3