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b3d937722d
Automatically disable single-step when the guest reaches the end of the verified section instead of using an explicit ucall() to ask userspace to disable single-step. An upcoming change to implement a pool-based scheme for ucall() will add an atomic operation (bit test and set) in the guest ucall code, and if the compiler generate "old school" atomics, e.g. 40e57c: c85f7c20 ldxr x0, [x1] 40e580: aa100011 orr x17, x0, x16 40e584: c80ffc31 stlxr w15, x17, [x1] 40e588: 35ffffaf cbnz w15, 40e57c <__aarch64_ldset8_sync+0x1c> the guest will hang as the local exclusive monitor is reset by eret, i.e. the stlxr will always fail due to the debug exception taken to EL2. Link: https://lore.kernel.org/all/20221006003409.649993-8-seanjc@google.com Cc: Oliver Upton <oliver.upton@linux.dev> Cc: Marc Zyngier <maz@kernel.org> Signed-off-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20221117002350.2178351-3-seanjc@google.com Reviewed-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.