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Linux kernel source tree
2e002ddc89
Drop AVIC_HPA_MASK and all its users, the mask is just the 4KiB-aligned maximum theoretical physical address for x86-64 CPUs, as x86-64 is currently defined (going beyond PA52 would require an entirely new paging mode, which would arguably create a new, different architecture). All usage in KVM masks the result of page_to_phys(), which on x86-64 is guaranteed to be 4KiB aligned and a legal physical address; if either of those requirements doesn't hold true, KVM has far bigger problems. Drop masking the avic_backing_page with AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK for all the same reasons, but keep the macro even though it's unused in functional code. It's a distinct architectural define, and having the definition in software helps visualize the layout of an entry. And to be hyper-paranoid about MAXPA going beyond 52, add a compile-time assert to ensure the kernel's maximum supported physical address stays in bounds. The unnecessary masking in avic_init_vmcb() also incorrectly assumes that SME's C-bit resides between bits 51:11; that holds true for current CPUs, but isn't required by AMD's architecture: In some implementations, the bit used may be a physical address bit Key word being "may". Opportunistically use the GENMASK_ULL() version for AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK, which is far more readable than a set of repeating Fs. Tested-by: Sairaj Kodilkar <sarunkod@amd.com> Reviewed-by: Naveen N Rao (AMD) <naveen@kernel.org> Link: https://lore.kernel.org/r/20250611224604.313496-11-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.