• Aneesh Kumar K.V's avatar
    powerpc/mm/hash64: Map all the kernel regions in the same 0xc range · 0034d395
    Aneesh Kumar K.V authored
    This patch maps vmalloc, IO and vmemap regions in the 0xc address range
    instead of the current 0xd and 0xf range. This brings the mapping closer
    to radix translation mode.
    
    With hash 64K page size each of this region is 512TB whereas with 4K config
    we are limited by the max page table range of 64TB and hence there regions
    are of 16TB size.
    
    The kernel mapping is now:
    
     On 4K hash
    
         kernel_region_map_size = 16TB
         kernel vmalloc start   = 0xc000100000000000
         kernel IO start        = 0xc000200000000000
         kernel vmemmap start   = 0xc000300000000000
    
    64K hash, 64K radix and 4k radix:
    
         kernel_region_map_size = 512TB
         kernel vmalloc start   = 0xc008000000000000
         kernel IO start        = 0xc00a000000000000
         kernel vmemmap start   = 0xc00c000000000000
    Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    0034d395
book3s_hv_rm_xics.c 23.8 KB