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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2022-06-28 16:48:57 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2022-06-29 17:04:15 +1000 |
| commit | 128c1ea2f838d3031a1c475607860e4271a8e9dc (patch) | |
| tree | 8a322cc1de4c04fb8c3c39e438a30b3ef01b9db4 /arch/powerpc/include/asm/nohash/64/pgtable.h | |
| parent | powerpc/64e: Remove unused REGION related macros (diff) | |
| download | linux-dev-128c1ea2f838d3031a1c475607860e4271a8e9dc.tar.xz linux-dev-128c1ea2f838d3031a1c475607860e4271a8e9dc.zip | |
powerpc/64e: Move virtual memory closer to linear memory
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
Diffstat (limited to 'arch/powerpc/include/asm/nohash/64/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/64/pgtable.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index d29f1d65ef05..9104cc4121b2 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -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) /* |