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powerpc/64e: Move virtual memory closer to linear memory

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Today nohash/64 have linear memory based at 0xc000000000000000 and
virtual memory based at 0x8000000000000000.

In order to implement KASAN, we need to regroup both areas.

Move virtual memmory at 0xc000100000000000.

This complicates a bit TLB miss handlers. Until now, memory region
was easily identified with the 4 higher bits of address:
- 0 ==> User
- c ==> Linear Memory
- 8 ==> Virtual Memory

Now we need to rely on the 20 higher bits, with:
- 0xxxx ==> User
- c0000 ==> Linear Memory
- c0001 ==> Virtual Memory

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4b225168031449fc34fc7132f3923cc8dc54af60.1656427701.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2022-06-28 16:48:57 +02:00
committed by Michael Ellerman
parent b646c1f7f4
commit 128c1ea2f8
2 changed files with 38 additions and 28 deletions
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2
arch/powerpc/include/asm/nohash/64/pgtable.h
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@@ -25,7 +25,7 @@
/*
* Define the address range of the kernel non-linear virtual area
*/
#define KERN_VIRT_START ASM_CONST(0x8000000000000000)
#define KERN_VIRT_START ASM_CONST(0xc000100000000000)
#define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
/*