4bb94d2de2
The new "use_va" module parameter (default: true) is used in vdpa_alloc_device() to inform the vDPA framework that the device supports VA. vringh is initialized to use VA only when "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 * unbounded/indefinite amount of time. Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20230404131734.45943-1-sgarzare@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.