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5ecdb48dd9
Stop ignoring DEBUGCTL[5:2] on AMD CPUs and instead treat them as reserved. KVM has never properly virtualized AMD's legacy PBi bits, but did allow the guest (and host userspace) to set the bits. To avoid breaking guests when running on CPUs with BusLockTrap, which redefined bit 2 to BLCKDB and made bits 5:3 reserved, a previous KVM change ignored bits 5:3, e.g. so that legacy guest software wouldn't inadvertently enable BusLockTrap or hit a VMRUN failure due to setting reserved. To allow for virtualizing BusLockTrap and whatever future features may use bits 5:3, treat bits 5:2 as reserved (and hope that doing so doesn't break any existing guests). Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@amd.com> Link: https://lore.kernel.org/r/20250227222411.3490595-7-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.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.