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With AVIC support for 4k vCPUs, the maximum supported physical ID in x2AVIC mode is 4095. Since this is no longer fixed, introduce a variable (x2avic_max_physical_id) to capture the maximum supported physical ID on the current platform and use that in place of the existing macro (X2AVIC_MAX_PHYSICAL_ID). With AVIC support for 4k vCPUs, the AVIC Physical ID table is no longer a single page and can occupy up to 8 contiguous 4k pages. Since AVIC hardware accesses of the physical ID table are limited by the physical max index programmed in the VMCB, it is sufficient to allocate only as many pages as are required to have a physical table entry for the max guest APIC ID. Since the guest APIC mode is not available at this point, provision for the maximum possible x2AVIC ID. For this purpose, add a variant of avic_get_max_physical_id() that works with a NULL vCPU pointer and returns the max x2AVIC ID. Wrap this in a new helper for obtaining the allocation order. To make it easy to identify support for 4k vCPUs in x2AVIC mode, update the message printed to the kernel log to print the maximum number of vCPUs supported. Do this on all platforms supporting x2AVIC since it is useful to know what is supported on a specific platform. Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Naveen N Rao (AMD) <naveen@kernel.org> Link: https://lore.kernel.org/r/7fc5962f6da028f7dd3c79dbbd5c574fa02c99dd.1757009416.git.naveen@kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> |
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| README | ||
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.