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c4371c2a68
Introduce RET_PF_FIXED and RET_PF_SPURIOUS to provide unique return values instead of overloading RET_PF_RETRY. In the short term, the unique values add clarity to the code and RET_PF_SPURIOUS will be used by set_spte() to avoid unnecessary work for spurious faults. In the long term, TDX will use RET_PF_FIXED to deterministically map memory during pre-boot. The page fault flow may bail early for benign reasons, e.g. if the mmu_notifier fires for an unrelated address. With only RET_PF_RETRY, it's impossible for the caller to distinguish between "cool, page is mapped" and "darn, need to try again", and thus cannot handle benign cases like the mmu_notifier retry. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200923220425.18402-4-sean.j.christopherson@intel.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.