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9c4fe6d150
When the TDP MMU is enabled, i.e. when the shadow MMU isn't used until a nested TDP VM is run, defer allocation of the array of hashed lists used to track shadow MMU pages until the first shadow root is allocated. Setting the list outside of mmu_lock is safe, as concurrent readers must hold mmu_lock in some capacity, shadow pages can only be added (or removed) from the list when mmu_lock is held for write, and tasks that are creating a shadow root are serialized by slots_arch_lock. I.e. it's impossible for the list to become non-empty until all readers go away, and so readers are guaranteed to see an empty list even if they make multiple calls to kvm_get_mmu_page_hash() in a single mmu_lock critical section. Use smp_store_release() and smp_load_acquire() to access the hash table pointer to ensure the stores to zero the lists are retired before readers start to walk the list. E.g. if the compiler hoisted the store before the zeroing of memory, for_each_gfn_valid_sp_with_gptes() could consume stale kernel data. Cc: James Houghton <jthoughton@google.com> Link: https://lore.kernel.org/r/20250523001138.3182794-5-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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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.