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The paste address mapping is done with mmap() after the window is opened with ioctl. The partition has to close VAS windows in the hypervisor if it lost credits due to DLPAR core removal. But the kernel marks these windows inactive until the previously lost credits are available later. If the window is inactive due to DLPAR after this mmap(), the paste instruction returns failure until the the OS reopens this window again. Before the user space issuing mmap(), there is a possibility of happening DLPAR core removal event which causes the corresponding window inactive. So if the window is not active, return mmap() failure with -EACCES and expects the user space reissue mmap() when the window is active or open a new window when the credit is available. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bbb203c26b324534e25658cb1dbbcb5160a2f93a.camel@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 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.