kernel.git/arch/powerpc/kernel/head_44x.S, branch linux-6.0.y

powerpc/32: Remove _ENTRY() macro

2022-02-07T10:03:10Z

_ENTRY() is now redundant with _GLOBAL(). Remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/62a35f8dde2bb74c8d0d7a5430cce07a5a3a6fb6.1638273868.git.christophe.leroy@csgroup.eu

powerpc/kuap: Wire-up KUAP on 44x

2021-12-09T11:41:20Z

This adds KUAP support to 44x. This is done by checking the content of SPRN_PID at the time it is read and written into SPRN_MMUCR. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/7d6c3f1978a26feada74b084f651e8cf1e3b3a47.1634627931.git.christophe.leroy@csgroup.eu

powerpc/44x: Activate KUEP at all time

2021-12-09T11:41:17Z

On 44x, KUEP is implemented by clearing SX bit during TLB miss for user pages. The impact is minimal and not worth neither boot time nor build time selection. Activate it at all time. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/2414d662558e7fb27d1ed41c8e47c591d576acac.1634627931.git.christophe.leroy@csgroup.eu

powerpc/booke: Avoid link stack corruption in several places

2021-08-25T03:35:47Z

Use bcl 20,31,+4 instead of bl in order to preserve link stack. See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption in __get_datapage()") for details. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e9fbc285eceb720e6c0e032ef47fe8b05f669b48.1629791751.git.christophe.leroy@csgroup.eu

powerpc: Define swapper_pg_dir[] in C

2021-06-16T14:09:10Z

Don't duplicate swapper_pg_dir[] in each platform's head.S Define it in mm/pgtable.c Define MAX_PTRS_PER_PGD because on book3s/64 PTRS_PER_PGD is not a constant. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5e3f1b8a4695c33ccc80aa3870e016bef32b85e1.1623063174.git.christophe.leroy@csgroup.eu

powerpc: Define empty_zero_page[] in C

2021-06-16T14:09:10Z

At the time being, empty_zero_page[] is defined in each platform head.S. Define it in mm/mem.c instead, and put it in BSS section instead of the DATA section. Commit 5227cfa71f9e ("arm64: mm: place empty_zero_page in bss") explains why it is interesting to have it in BSS. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5838caffa269e0957c5a50cc85477876220298b0.1623063174.git.christophe.leroy@csgroup.eu

powerpc/nohash: Convert set_context() to C

2021-06-16T14:09:09Z

ppc8xx already has set_context() in C. Other ones have it in assembly. The only thing it does is to write the context id into SPRN_PID. Do it in C. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a5d0759064f3831c6b88af49ef5d3b05ba1c4dad.1622712515.git.christophe.leroy@csgroup.eu

powerpc/nohash: Refactor update of BDI2000 pointers in switch_mmu_context()

2021-06-16T14:09:09Z

Instead of duplicating the update of BDI2000 pointers in set_context(), do it directly from switch_mmu_context(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/4c54997edd3548fa54717915e7c6ebaf60f208c0.1622712515.git.christophe.leroy@csgroup.eu

powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)

2021-06-16T14:09:07Z

Powerpc 44x has two bits for exec protection in TLBs: one for user (UX) and one for superviser (SX). Clear SX on user pages in TLB miss handlers to provide KUEP. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/169310e08152aa1d96c979770291d165ec6896ae.1622616032.git.christophe.leroy@csgroup.eu

powerpc/32: Remove the xfer parameter in EXCEPTION() macro

2021-03-29T02:22:09Z

The xfer parameter is not used anymore, remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/17c7d68bd18f7d2f1ab24a1a20d9ed33bbcda741.1615552867.git.christophe.leroy@csgroup.eu