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| Filename | Latest commit message | Latest commit date |
|---|---|---|
cae7ed3c2c
The code to propagate the memslots generation number into MMIO sptes is
a bit convoluted. The "what" is relatively straightfoward, e.g. the
comment explaining which bits go where is quite readable, but the "how"
requires a lot of staring to understand what is happening. For example,
'MMIO_GEN_LOW_SHIFT' is actually used to calculate the high bits of the
spte, while 'MMIO_SPTE_GEN_LOW_SHIFT' is used to calculate the low bits.
Refactor the code to:
- use #defines whose values align with the bits defined in the comment
- use consistent code for both the high and low mask
- explicitly highlight the handling of bit 0 (update in-progress flag)
- explicitly call out that the defines are for MMIO sptes (to avoid
confusion with the per-vCPU MMIO cache, which uses the full memslots
generation)
In addition to making the code a little less magical, this paves the way
for moving the update in-progress flag to bit 63 without having to
simultaneously rewrite all of the MMIO spte code.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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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.