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* kvm-arm64/nvhe-stacktrace: (27 commits) : . : Add an overflow stack to the nVHE EL2 code, allowing : the implementation of an unwinder, courtesy of : Kalesh Singh. From the cover letter (slightly edited): : : "nVHE has two modes of operation: protected (pKVM) and unprotected : (conventional nVHE). Depending on the mode, a slightly different approach : is used to dump the hypervisor stacktrace but the core unwinding logic : remains the same. : : * Protected nVHE (pKVM) stacktraces: : : In protected nVHE mode, the host cannot directly access hypervisor memory. : : The hypervisor stack unwinding happens in EL2 and is made accessible to : the host via a shared buffer. Symbolizing and printing the stacktrace : addresses is delegated to the host and happens in EL1. : : * Non-protected (Conventional) nVHE stacktraces: : : In non-protected mode, the host is able to directly access the hypervisor : stack pages. : : The hypervisor stack unwinding and dumping of the stacktrace is performed : by the host in EL1, as this avoids the memory overhead of setting up : shared buffers between the host and hypervisor." : : Additional patches from Oliver Upton and Marc Zyngier, tidying up : the initial series. : . arm64: Update 'unwinder howto' KVM: arm64: Don't open code ARRAY_SIZE() KVM: arm64: Move nVHE-only helpers into kvm/stacktrace.c KVM: arm64: Make unwind()/on_accessible_stack() per-unwinder functions KVM: arm64: Move nVHE stacktrace unwinding into its own compilation unit KVM: arm64: Move PROTECTED_NVHE_STACKTRACE around KVM: arm64: Introduce pkvm_dump_backtrace() KVM: arm64: Implement protected nVHE hyp stack unwinder KVM: arm64: Save protected-nVHE (pKVM) hyp stacktrace KVM: arm64: Stub implementation of pKVM HYP stack unwinder KVM: arm64: Allocate shared pKVM hyp stacktrace buffers KVM: arm64: Add PROTECTED_NVHE_STACKTRACE Kconfig KVM: arm64: Introduce hyp_dump_backtrace() KVM: arm64: Implement non-protected nVHE hyp stack unwinder KVM: arm64: Prepare non-protected nVHE hypervisor stacktrace KVM: arm64: Stub implementation of non-protected nVHE HYP stack unwinder KVM: arm64: On stack overflow switch to hyp overflow_stack arm64: stacktrace: Add description of stacktrace/common.h arm64: stacktrace: Factor out common unwind() arm64: stacktrace: Handle frame pointer from different address spaces ... 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 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.