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ec48673552
On POWER8, in case of - nap: both timebase and hypervisor state is retained. - fast-sleep: timebase is lost. But the hypervisor state is retained. - winkle: timebase and hypervisor state is lost. Hence, the current code for handling exit from a idle state assumes that if the timebase value is retained, then so is the hypervisor state. Thus, the current code doesn't restore per-core hypervisor state in such cases. But that is no longer the case on POWER9 where we do have stop states in which timebase value is retained, but the hypervisor state is lost. So we have to ensure that the per-core hypervisor state gets restored in such cases. Fix this by ensuring that even in the case when timebase is retained, we explicitly check if we are waking up from a deep stop that loses per-core hypervisor state (indicated by cr4 being eq or gt), and if this is the case, we restore the per-core hypervisor state. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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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.