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The functions kvmppc_st and kvmppc_ld are used to access guest memory from the host using a guest effective address. They do so by translating through the process table to obtain a guest real address and then using kvm_read_guest or kvm_write_guest to make the access with the guest real address. This method of access however only works for L1 guests and will give the incorrect results for a nested guest. We can however use the store_to_eaddr and load_from_eaddr kvmppc_ops to perform the access for a nested guesti (and a L1 guest). So attempt this method first and fall back to the old method if this fails and we aren't running a nested guest. At this stage there is no fall back method to perform the access for a nested guest and this is left as a future improvement. For now we will return to the nested guest and rely on the fact that a translation should be faulted in before retrying the access. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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.