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When translating a VNCR translation fault, we start by marking the
current SW-managed TLB as invalid, so that we can populate it
in place. This is, however, done without the mmu_lock held.
A consequence of this is that another CPU dealing with TLBI
emulation can observe a translation still flagged as valid, but
with invalid walk results (such as pgshift being 0). Bad things
can result from this, such as a BUG() in pgshift_level_to_ttl().
Fix it by taking the mmu_lock for write to perform this local
invalidation, and use invalidate_vncr() instead of open-coding
the write to the 'valid' flag.
Fixes: 069a05e535 ("KVM: arm64: nv: Handle VNCR_EL2-triggered faults")
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250520144116.3667978-1-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@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 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.