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The normal interrupt flow is not to enable the vgic when no virtual interrupt is to be injected (i.e. the LRs are empty). But when a guest is likely to use GICv4 for LPIs, we absolutely need to switch it on at all times. Otherwise, VLPIs only get delivered when there is something in the LRs, which doesn't happen very often. Reported-by: Nianyao Tang <tangnianyao@huawei.com> Tested-by: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.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.