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Recently the generic timer test of kvm-unit-tests failed to complete (stalled) when a physical timer is being used. This issue is caused by incorrect update of CNTP_CVAL when CNTP_TVAL is being accessed, introduced by 'Commit84135d3d18("KVM: arm/arm64: consolidate arch timer trap handlers")'. According to Arm ARM, the read/write behavior of accesses to the TVAL registers is expected to be: * READ: TimerValue = (CompareValue – (Counter - Offset) * WRITE: CompareValue = ((Counter - Offset) + Sign(TimerValue) This patch fixes the TVAL read/write code path according to the specification. Fixes:84135d3d18("KVM: arm/arm64: consolidate arch timer trap handlers") Signed-off-by: Wei Huang <wei@redhat.com> [maz: commit message tidy-up] 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.