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faf729621c
Before the separation of the CPU and the MMU role, CR0.PG was not available in the base MMU role, because two-dimensional paging always used direct=1 in the MMU role. However, now that the raw role is snapshotted in mmu->cpu_role, the value of CR0.PG always matches both !cpu_role.base.direct and cpu_role.base.level > 0. There is no need to store it again in union kvm_mmu_extended_role; instead, write an is_cr0_pg accessor by hand that takes care of the conversion. Use cpu_role.base.level since the future of the direct field is unclear. Likewise, CR4.PAE is now always present in the CPU role as !cpu_role.base.has_4_byte_gpte. The inversion makes certain tests on the MMU role easier, and is easily hidden by the is_cr4_pae accessor when operating on the CPU role. 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.