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d47533dab9
We are about to defer saving and restoring some groups of system registers to vcpu_put and vcpu_load on supported systems. This means that we need some infrastructure to access system registes which supports either accessing the memory backing of the register or directly accessing the system registers, depending on the state of the system when we access the register. We do this by defining read/write accessor functions, which can handle both "immediate" and "deferrable" system registers. Immediate registers are always saved/restored in the world-switch path, but deferrable registers are only saved/restored in vcpu_put/vcpu_load when supported and sysregs_loaded_on_cpu will be set in that case. Note that we don't use the deferred mechanism yet in this patch, but only introduce infrastructure. This is to improve convenience of review in the subsequent patches where it is clear which registers become deferred. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.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.