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5cb1659f41
TL;DR: Eliminate KVM's long-standing (and heinous) behavior of essentially guessing which pfns are refcounted pages (see kvm_pfn_to_refcounted_page()). Getting there requires "fixing" arch code that isn't obviously broken. Specifically, to get rid of kvm_pfn_to_refcounted_page(), KVM needs to stop marking pages/folios dirty/accessed based solely on the pfn that's stored in KVM's stage-2 page tables. Instead of tracking which SPTEs correspond to refcounted pages, simply remove all of the code that operates on "struct page" based ona the pfn in stage-2 PTEs. This is the back ~40-50% of the series. For x86 in particular, which sets accessed/dirty status when that info would be "lost", e.g. when SPTEs are zapped or KVM clears the dirty flag in a SPTE, foregoing the updates provides very measurable performance improvements for related operations. E.g. when clearing dirty bits as part of dirty logging, and zapping SPTEs to reconstitue huge pages when disabling dirty logging. The front ~40% of the series is cleanups and prep work, and most of it is x86 focused (purely because x86 added the most special cases, *sigh*). E.g. several of the inputs to hva_to_pfn() (and it's myriad wrappers), can be removed by cleaning up and deduplicating x86 code. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| kernel | ||
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| virt | ||
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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.