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arm64: head: cover entire kernel image in initial ID map
As a first step towards avoiding the need to create, tear down and recreate the kernel virtual mapping with MMU and caches disabled, start by expanding the ID map so it covers the page tables as well as all executable code. This will allow us to populate the page tables with the MMU and caches on, and call KASLR init code before setting up the virtual mapping. Since this ID map is only needed at boot, create it as a temporary set of page tables, and populate the permanent ID map after enabling the MMU and caches. While at it, switch to read-only attributes for the where possible, as writable permissions are only needed for the initial kernel page tables. Note that on 4k granule configurations, the permanent ID map will now be reduced to a single page rather than a 2M block mapping. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20220624150651.1358849-13-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
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