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When a vcpu priority (CPPR) is set to a lower value (masking more interrupts), we stop processing interrupts already in the queue for the priorities that have now been masked. If those interrupts were previously re-routed to a different CPU, they might still be stuck until the older one that has them in its queue processes them. In the case of guest CPU unplug, that can be never. To address that without creating additional overhead for the normal interrupt processing path, this changes H_CPPR handling so that when such a priority change occurs, we scan the interrupt queue for that vCPU, and for any interrupt in there that has been re-routed, we replace it with a dummy and force a re-trigger. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Paul Mackerras <paulus@ozlabs.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.