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[ Upstream commitebff0b0e3d] We've become very cautious to now always reset the vcpu when nothing is loaded on the physical CPU. To do so, we now disable preemption and do a kvm_arch_vcpu_put() to make sure we have all the state in memory (and that it won't be loaded behind out back). This now causes issues with resetting the PMU, which calls into perf. Perf itself uses mutexes, which clashes with the lack of preemption. It is worth realizing that the PMU is fully emulated, and that no PMU state is ever loaded on the physical CPU. This means we can perfectly reset the PMU outside of the non-preemptible section. Fixes:e761a927bc("KVM: arm/arm64: Reset the VCPU without preemption and vcpu state loaded") Reported-by: Julien Grall <julien.grall@arm.com> Tested-by: Julien Grall <julien.grall@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Sasha Levin (Microsoft) <sashal@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 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.