61f9447854
Set nx_huge_page_disallowed in TDP MMU shadow pages before making the SP visible to other readers, i.e. before setting its SPTE. This will allow KVM to query the flag when determining if a shadow page can be replaced by a NX huge page without violating the rules of the mitigation. Note, the shadow/legacy MMU holds mmu_lock for write, so it's impossible for another CPU to see a shadow page without an up-to-date nx_huge_page_disallowed, i.e. only the TDP MMU needs the complicated dance. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: David Matlack <dmatlack@google.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Message-Id: <20221019165618.927057-5-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.