3c8f5965a9
[ Upstream commit 9e90e58c11b74c2bddac4b2702cf79d36b981278 ] Currently the handling of events is supported either in the kernel or userspace, but not both. In order to support fast delivery of interrupts from the guest to the backend, we need to handle the Queue notify part of Virtio protocol in kernel and the rest in userspace. Update the interrupt handler registration flag to IRQF_SHARED for event channels, which would allow multiple entities to bind their interrupt handler for the same event channel port. Also increment the reference count of irq_info when multiple entities try to bind event channel to irqchip, so the unbinding happens only after all the users are gone. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/99b1edfd3147c6b5d22a5139dab5861e767dc34a.1697439990.git.viresh.kumar@linaro.org Signed-off-by: Juergen Gross <jgross@suse.com> Stable-dep-of: fa765c4b4aed ("xen/events: close evtchn after mapping cleanup") Signed-off-by: Sasha Levin <sashal@kernel.org>
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.