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e016333745
The general expecation with feature ID registers is that they're 'reset' exactly once by KVM for the lifetime of a vCPU/VM, such that any userspace changes to the CPU features / identity are honored after a vCPU gets reset (e.g. PSCI_ON). KVM handles what it calls VM-scoped feature ID registers correctly, but feature ID registers local to a vCPU (CLIDR_EL1, MPIDR_EL1) get wiped after every reset. What's especially concerning is that a potentially-changing MPIDR_EL1 breaks MPIDR compression for indexing mpidr_data, as the mask of useful bits to build the index could change. This is absolutely no good. Avoid resetting vCPU feature ID registers more than once. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Link: https://lore.kernel.org/r/20240502233529.1958459-4-oliver.upton@linux.dev Signed-off-by: Marc Zyngier <maz@kernel.org> |
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| fs | ||
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| ipc | ||
| kernel | ||
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| .clang-format | ||
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| .get_maintainer.ignore | ||
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| .gitignore | ||
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| README | ||
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 reStructuredText 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.