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Implement and setup necessary structures to send a prepolulated Guest-State-Buffer(GSB) requesting hostwide counters to L0-PowerVM and have the returned GSB holding the values of these counters parsed. This is done via existing GSB implementation and with the newly added support of Hostwide elements in GSB. The request to L0-PowerVM to return Hostwide counters is done using a pre-allocated GSB named 'gsb_l0_stats'. To be able to populate this GSB with the needed Guest-State-Elements (GSIDs) a instance of 'struct kvmppc_gs_msg' named 'gsm_l0_stats' is introduced. The 'gsm_l0_stats' is tied to an instance of 'struct kvmppc_gs_msg_ops' named 'gsb_ops_l0_stats' which holds various callbacks to be compute the size ( hostwide_get_size() ), populate the GSB ( hostwide_fill_info() ) and refresh ( hostwide_refresh_info() ) the contents of 'l0_stats' that holds the Hostwide counters returned from L0-PowerVM. To protect these structures from simultaneous access a spinlock 'lock_l0_stats' has been introduced. The allocation and initialization of the above structures is done in newly introduced kvmppc_init_hostwide() and similarly the cleanup is performed in newly introduced kvmppc_cleanup_hostwide(). Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250416162740.93143-6-vaibhav@linux.ibm.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 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.