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Eric Hankland
66bb8a065f
Some events can provide a guest with information about other guests or the host (e.g. L3 cache stats); providing the capability to restrict access to a "safe" set of events would limit the potential for the PMU to be used in any side channel attacks. This change introduces a new VM ioctl that sets an event filter. If the guest attempts to program a counter for any blacklisted or non-whitelisted event, the kernel counter won't be created, so any RDPMC/RDMSR will show 0 instances of that event. Signed-off-by: Eric Hankland <ehankland@google.com> [Lots of changes. All remaining bugs are probably mine. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.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 Restructured Text 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.