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In the latest APM describing AVIC support for 4k vCPUs, VMCB AVIC_PHYSICAL_MAX_INDEX (Offset 0xF8) and EXITINFO2.Index are both updated from 9-bit wide to 12-bit wide fields unconditionally (i.e., regardless of AVIC support for 4k vCPUs). Expand AVIC_PHYSICAL_MAX_INDEX_MASK accordingly. While AVIC_PHYSICAL_MAX_INDEX_MASK is updated to a 12-bit field, KVM will limit the max vCPU/APIC ID based on the maximum supported on a specific processor and enforce that limit during vCPU creation. I.e., KVM doesn't need to rely on the mask to ensure that the max APIC ID being programmed in the VMCB is in range. The additional bits (11:9) were previously marked reserved and were never set/read by older processors. Signed-off-by: Naveen N Rao (AMD) <naveen@kernel.org> Link: https://lore.kernel.org/r/a24ae953cea716bf9c56c136f7ca4bf5e97b1080.1757009416.git.naveen@kernel.org 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 reStructuredText 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.