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Even though KVM sets up MDCR_EL2 to trap accesses to the SPE buffer and sampling control registers and to inject an undefined exception, the presence of FEAT_SPE is still advertised in the ID_AA64DFR0_EL1 register, if the hardware supports it. Getting an undefined exception when accessing a register usually happens for a hardware feature which is not implemented, and indeed this is how PMU emulation is handled when the virtual machine has been created without the KVM_ARM_VCPU_PMU_V3 feature. Let's be consistent and never advertise FEAT_SPE, because KVM doesn't have support for emulating it yet. Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210409152154.198566-3-alexandru.elisei@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.