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e3f019b37b
We so far mapped our HYP IO (which is essentially the GICv2 control registers) using the same method as for memory. It recently appeared that is a bit unsafe: We compute the HYP VA using the kern_hyp_va helper, but that helper is only designed to deal with kernel VAs coming from the linear map, and not from the vmalloc region... This could in turn cause some bad aliasing between the two, amplified by the upcoming VA randomisation. A solution is to come up with our very own basic VA allocator for MMIO. Since half of the HYP address space only contains a single page (the idmap), we have plenty to borrow from. Let's use the idmap as a base, and allocate downwards from it. GICv2 now lives on the other side of the great VA barrier. Acked-by: Catalin Marinas <catalin.marinas@arm.com> 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.