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db9cf24cea
Add support for extended hypercall in Hyper-v. Hyper-v TLFS 6.0b describes hypercalls above call code 0x8000 as extended hypercalls. A Hyper-v hypervisor's guest VM finds availability of extended hypercalls via CPUID.0x40000003.EBX BIT(20). If the bit is set then the guest can call extended hypercalls. All extended hypercalls will exit to userspace by default. This allows for easy support of future hypercalls without being dependent on KVM releases. If there will be need to process the hypercall in KVM instead of userspace then KVM can create a capability which userspace can query to know which hypercalls can be handled by the KVM and enable handling of those hypercalls. Signed-off-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Link: https://lore.kernel.org/r/20221212183720.4062037-10-vipinsh@google.com Signed-off-by: Sean Christopherson <seanjc@google.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.