Messages in this thread | | | Date | Thu, 16 Mar 2023 09:31:22 +0100 | From | Stefano Garzarella <> | Subject | Re: [PATCH v2 2/8] vhost-vdpa: use bind_mm/unbind_mm device callbacks |
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On Tue, Mar 14, 2023 at 11:48:33AM +0800, Jason Wang wrote: >On Thu, Mar 2, 2023 at 7:34 PM Stefano Garzarella <sgarzare@redhat.com> wrote: >> >> 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 <sgarzare@redhat.com> >> --- >> >> Notes: >> v2: >> - call the new unbind_mm callback during the release [Jason] >> - avoid to call bind_mm callback after the reset, since the device >> is not detaching it now during the reset >> >> drivers/vhost/vdpa.c | 30 ++++++++++++++++++++++++++++++ >> 1 file changed, 30 insertions(+) >> >> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c >> index dc12dbd5b43b..1ab89fccd825 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; >> @@ -711,6 +733,13 @@ 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; >> + } >> + } > >Nit: is it better to have a new condition/switch branch instead of >putting them under default? (as what vring_ioctl did).
Yep, I agree!
I'll change it.
Thanks, Stefano
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