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The SECURE_AVIC_CONTROL MSR holds the GPA of the guest APIC backing page and bitfields to control enablement of Secure AVIC and whether the guest allows NMIs to be injected by the hypervisor. This MSR is populated by the guest and can be read by the guest to get the GPA of the APIC backing page. The MSR can only be accessed in Secure AVIC mode. Any attempt to access it when not in Secure AVIC mode results in #GP. So, the hypervisor should not intercept it. A #VC exception will be generated otherwise. If this occurs and Secure AVIC is enabled, terminate the guest execution. Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tianyu Lan <tiala@microsoft.com> Link: https://lore.kernel.org/20250828113119.209135-1-Neeraj.Upadhyay@amd.com |
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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.