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When making a SPTE, cache whether or not the target PFN is host MMIO in order to avoid multiple rounds of the slow path of kvm_is_mmio_pfn(), e.g. hitting pat_pfn_immune_to_uc_mtrr() in particular can be problematic. KVM currently avoids multiple calls by virtue of the two users being mutually exclusive (.get_mt_mask() is Intel-only, shadow_me_value is AMD-only), but that won't hold true if/when KVM needs to detect host MMIO mappings for other reasons, e.g. for mitigating the MMIO Stale Data vulnerability. No functional change intended. Tested-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Link: https://lore.kernel.org/r/20250523011756.3243624-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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.