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When executing the INVLPGB instruction on a bare-metal host or hypervisor, if the ASID valid bit is not set, the instruction will flush the TLB entries that match the specified criteria for any ASID, not just the those of the host. If virtual machines are running on the system, this may result in inadvertent flushes of guest TLB entries. When executing the INVLPGB instruction in a guest and the INVLPGB instruction is not intercepted by the hypervisor, the hardware will replace the requested ASID with the guest ASID and set the ASID valid bit before doing the broadcast invalidation. Thus a guest is only able to flush its own TLB entries. So to limit the host TLB flushing reach, always set the ASID valid bit using an ASID value of 0 (which represents the host/hypervisor). This will will result in the desired effect in both host and guest. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20250304120449.GHZ8bsYYyEBOKQIxBm@fat_crate.local |
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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.