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* kvm-arm64/feat_e2h0: : Support for FEAT_E2H0, courtesy of Marc Zyngier : : As described in the cover letter: : : Since ARMv8.1, the architecture has grown the VHE feature, which makes : EL2 a superset of EL1. With ARMv9.5 (and retroactively allowed from : ARMv8.1), the architecture allows implementations to have VHE as the : *only* implemented behaviour, meaning that HCR_EL2.E2H can be : implemented as RES1. As a follow-up, HCR_EL2.NV1 can also be : implemented as RES0, making the VHE-ness of the architecture : recursive. : : This series adds support for detecting the architectural feature of E2H : being RES1, leveraging the existing infrastructure for handling : out-of-spec CPUs that are VHE-only. Additionally, the (incomplete) NV : infrastructure in KVM is updated to enforce E2H=1 for guest hypervisors : on implementations that do not support NV1. arm64: cpufeatures: Fix FEAT_NV check when checking for FEAT_NV1 arm64: cpufeatures: Only check for NV1 if NV is present arm64: cpufeatures: Add missing ID_AA64MMFR4_EL1 to __read_sysreg_by_encoding() KVM: arm64: Handle Apple M2 as not having HCR_EL2.NV1 implemented KVM: arm64: Force guest's HCR_EL2.E2H RES1 when NV1 is not implemented KVM: arm64: Expose ID_AA64MMFR4_EL1 to guests arm64: Treat HCR_EL2.E2H as RES1 when ID_AA64MMFR4_EL1.E2H0 is negative arm64: cpufeature: Detect HCR_EL2.NV1 being RES0 arm64: cpufeature: Add ID_AA64MMFR4_EL1 handling arm64: sysreg: Add layout for ID_AA64MMFR4_EL1 arm64: cpufeature: Correctly display signed override values arm64: cpufeatures: Correctly handle signed values arm64: Add macro to compose a sysreg field value Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
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.