search for: unbind_mm

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 at redhat.com> --- Notes: v3: - added `case VHOST_SET_OWNER` in vhost_vdpa_unlocked_ioctl() [Jason] v2: - call the new unbind_mm callback during the release [Jason]...

...zarella <sgarzare at 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 at redhat.com> > --- > > Notes: > v3: > - added `case VHOST_SET_OWNER` in vhost_vdpa_unlocked_ioctl() [Jason] > v2: > - call the new...

...en these callbacks are implemented. Suggested-by: Jason Wang <jasowang at redhat.com> Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- Notes: v2: - removed `struct task_struct *owner` param (unused for now, maybe useful to support cgroups) [Jason] - add unbind_mm callback [Jason] include/linux/vdpa.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 43f59ef10cc9..369c21394284 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -290,6 +290,14 @@ struct vdpa_map_file { * @vdev:...

..."use_va" is true and the > user's mm has been bound. So, only when the bus supports user VA > (e.g. vhost-vdpa). > > vdpasim_mm_work_fn work is used to attach the kthread to the user > address space when the .bind_mm callback is invoked, and to detach > it when the .unbind_mm callback is invoked. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > --- > > Notes: > v2: > - `use_va` set to true by default [Eugenio] > - supported the new unbind_mm callback [Jason] > - removed the unbind_mm call in vdpasim_do_res...

...hen "use_va" is true and the > user's mm has been bound. So, only when the bus supports user VA > (e.g. vhost-vdpa). > > vdpasim_mm_work_fn work is used to serialize the binding to a new > address space when the .bind_mm callback is invoked, and unbinding > when the .unbind_mm callback is invoked. > > Call mmget_not_zero()/kthread_use_mm() inside the worker function > to pin the address space only as long as needed, following the > documentation of mmget() in include/linux/sched/mm.h: > > * Never use this function to pin this address space for an &gt...

v2: - rebased on Linus' tree, commit ae3419fbac84 ("vc_screen: don't clobber return value in vcs_read") - removed `struct task_struct *owner` param (unused for now, maybe ?useful to support cgroups) [Jason] - add unbind_mm callback [Jason] - 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 - added new patch replace kmap_atomic() with kmap_local_page() since ?checkpatch.pl complained about deprecati...

...hen "use_va" is true and the > user's mm has been bound. So, only when the bus supports user VA > (e.g. vhost-vdpa). > > vdpasim_mm_work_fn work is used to serialize the binding to a new > address space when the .bind_mm callback is invoked, and unbinding > when the .unbind_mm callback is invoked. > > Call mmget_not_zero()/kthread_use_mm() inside the worker function > to pin the address space only as long as needed, following the > documentation of mmget() in include/linux/sched/mm.h: > > * Never use this function to pin this address space for an >...

...at.com/ v3: https://lore.kernel.org/lkml/20230321154228.182769-1-sgarzare at redhat.com/ v2: https://lore.kernel.org/lkml/20230302113421.174582-1-sgarzare at redhat.com/ RFC v1: https://lore.kernel.org/lkml/20221214163025.103075-1-sgarzare at redhat.com/ Stefano Garzarella (9): vdpa: add bind_mm/unbind_mm callbacks vhost-vdpa: use bind_mm/unbind_mm device callbacks vringh: replace kmap_atomic() with kmap_local_page() vringh: define the stride used for translation vringh: support VA with iotlb vdpa_sim: make devices agnostic for work management vdpa_sim: use kthread worker vdpa_sim: rep...

...vented the overcommit of guest memory. Thanks, Stefano Changelog listed in each patch. v2: https://lore.kernel.org/lkml/20230302113421.174582-1-sgarzare at redhat.com/ RFC v1: https://lore.kernel.org/lkml/20221214163025.103075-1-sgarzare at redhat.com/ Stefano Garzarella (8): vdpa: add bind_mm/unbind_mm callbacks vhost-vdpa: use bind_mm/unbind_mm device callbacks vringh: replace kmap_atomic() with kmap_local_page() vringh: support VA with iotlb vdpa_sim: make devices agnostic for work management vdpa_sim: use kthread worker vdpa_sim: replace the spinlock with a mutex to protect the sta...

...s true and the >> user's mm has been bound. So, only when the bus supports user VA >> (e.g. vhost-vdpa). >> >> vdpasim_mm_work_fn work is used to serialize the binding to a new >> address space when the .bind_mm callback is invoked, and unbinding >> when the .unbind_mm callback is invoked. >> >> Call mmget_not_zero()/kthread_use_mm() inside the worker function >> to pin the address space only as long as needed, following the >> documentation of mmget() in include/linux/sched/mm.h: >> >> * Never use this function to pin this a...

Let's move work management inside the vdpa_sim core. This way we can easily change how we manage the works, without having to change the devices each time. Acked-by: Eugenio P??rez Martin <eperezma at redhat.com> Acked-by: Jason Wang <jasowang at redhat.com> Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- drivers/vdpa/vdpa_sim/vdpa_sim.h | 3 ++-

...n bound. So, only when the bus supports user VA >> >> (e.g. vhost-vdpa). >> >> >> >> vdpasim_mm_work_fn work is used to serialize the binding to a new >> >> address space when the .bind_mm callback is invoked, and unbinding >> >> when the .unbind_mm callback is invoked. >> >> >> >> Call mmget_not_zero()/kthread_use_mm() inside the worker function >> >> to pin the address space only as long as needed, following the >> >> documentation of mmget() in include/linux/sched/mm.h: >> >> >&...