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b8b9156ec6
Add a comment to FNAME(sync_page) to explain why the TLB flushing logic conspiculously doesn't handle the scenario of guest protections being reduced. Specifically, if synchronizing a SPTE drops execute protections, KVM will not emit a TLB flush, whereas dropping writable or clearing A/D bits does trigger a flush via mmu_spte_update(). Architecturally, until the GPTE is implicitly or explicitly flushed from the guest's perspective, KVM is not required to flush any old, stale translations. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Jim Mattson <jmattson@google.com> Message-Id: <20220513195000.99371-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.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 Restructured Text 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.