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db7d8e4768
Export x2apic_mode so that KVM can query whether x2APIC is active without having to incur the RDMSR in x2apic_enabled(). When Posted Interrupts are in use for a guest with an assigned device, KVM ends up checking for x2APIC at least once every time a vCPU halts. KVM could obviously snapshot x2apic_enabled() to avoid the RDMSR, but that's rather silly given that x2apic_mode holds the exact info needed by KVM. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210115220354.434807-2-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.