Will Deacon f992b4dfd5 arm64: kpti: Add ->enable callback to remap swapper using nG mappings ... Defaulting to global mappings for kernel space is generally good for performance and appears to be necessary for Cavium ThunderX. If we subsequently decide that we need to enable kpti, then we need to rewrite our existing page table entries to be non-global. This is fiddly, and made worse by the possible use of contiguous mappings, which require a strict break-before-make sequence. Since the enable callback runs on each online CPU from stop_machine context, we can have all CPUs enter the idmap, where secondaries can wait for the primary CPU to rewrite swapper with its MMU off. It's all fairly horrible, but at least it only runs once. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2018-02-06 22:53:18 +00:00
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asm	arm64: kpti: Add ->enable callback to remap swapper using nG mappings	2018-02-06 22:53:18 +00:00
uapi/asm	arm64: v8.4: Support for new floating point multiplication instructions	2018-01-05 11:29:48 +00:00