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 reStructuredText 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.
Marc Zyngier
authored
commit 4cb77793842a351b39a030f77caebace3524840e upstream.
Christoph reports that their rk3399 system dies since commit 773c05f417fa1
("irqchip/gic-v3: Work around insecure GIC integrations").
It appears that some rk3399 have secure payloads, and that the firmware
sets SCR_EL3.FIQ==1. Obivously, disabling security in that configuration
leads to even more problems.
Revisit the workaround by:
- making it rk3399 specific
- checking whether Group-0 is available, which is a good proxy
for SCR_EL3.FIQ being 0
- either apply the workaround if Group-0 is available, or disable
pseudo-NMIs if not
Note that this doesn't mean that the secure side is able to receive
interrupts, as all interrupts are made non-secure anyway.
Clearly, nobody ever tested secure interrupts on this platform.
Fixes: 773c05f417fa1 ("irqchip/gic-v3: Work around insecure GIC integrations")
Reported-by: 
Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: 
Marc Zyngier <maz@kernel.org>
Signed-off-by: 
Thomas Gleixner <tglx@linutronix.de>
Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20250215185241.3768218-1-maz@kernel.org
Closes: https://lore.kernel.org/r/b1266652fb64857246e8babdf268d0df8f0c36d9.camel@googlemail.com
Signed-off-by: 
Greg Kroah-Hartman <gregkh@linuxfoundation.org>