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cpu: Support setting HID[RADIX] and set it by default on P9
This adds new opal_reinit_cpus() flags to setup radix or hash mode in HID[8] on POWER9. By default HID[8] will be set. On P9 DD1.0, Linux will change it as needed. On P9 DD2.0 hash works in radix mode (radix is really "dual" mode) so KVM won't break and existing kernels will work. Newer kernels built for hash will call this to clear the HID bit and thus get the full size of the TLB as an optimization. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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