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Apart from various bugfixes and code cleanups, the major new feature
is the ability to run guests using the hashed page table (HPT) MMU
mode on a host that is using the radix MMU mode. Because of limitations
in the current POWER9 chip (all SMT threads in each core must use the
same MMU mode, HPT or radix), this requires the host to be configured
to run similar to POWER8: the host runs in single-threaded mode (only
thread 0 of each core online), and have KVM be able to wake up the other
threads when a KVM guest is to be run, and use the other threads for
running guest VCPUs. A new module parameter, called "indep_threads_mode",
is normally Y on POWER9 but must be set to N before any HPT guests can
be run on a radix host:
# echo N >/sys/module/kvm_hv/parameters/indep_threads_mode
# ppc64_cpu --smt=off
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.