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1408fca0 |
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09-Apr-2022 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/mm: Make slice specific to book3s/64 Since commit 555904d07eef ("powerpc/8xx: MM_SLICE is not needed anymore") only book3s/64 selects CONFIG_PPC_MM_SLICES. Move slice.c into mm/book3s64/ Move necessary stuff in asm/book3s/64/slice.h and remove asm/slice.h Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4a0d74ef1966a5902b5fd4ac4b513a760a6d675a.1649523076.git.christophe.leroy@csgroup.eu
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43afcf8f |
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19-Oct-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc: Add KUAP support for BOOKE and 40x On booke/40x we don't have segments like book3s/32. On booke/40x we don't have access protection groups like 8xx. Use the PID register to provide user access protection. Kernel address space can be accessed with any PID. User address space has to be accessed with the PID of the user. User PID is always not null. Everytime the kernel is entered, set PID register to 0 and restore PID register when returning to user. Everytime kernel needs to access user data, PID is restored for the access. In TLB miss handlers, check the PID and bail out to data storage exception when PID is 0 and accessed address is in user space. Note that also forbids execution of user text by kernel except when user access is unlocked. But this shouldn't be a problem as the kernel is not supposed to ever run user text. This patch prepares the infrastructure but the real activation of KUAP is done by following patches for each processor type one by one. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/5d65576a8e31e9480415785a180c92dd4e72306d.1634627931.git.christophe.leroy@csgroup.eu
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e2c04316 |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Remove DEBUG_HARDER DEBUG_HARDER is not user selectable. Remove it together with related messages. Also remove two pr_devel() messages that should likely have been pr_hard(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0f25109b0e12fdd1e6541dedbb2212cc53526a57.1622712515.git.christophe.leroy@csgroup.eu
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a36c0faf |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Remove DEBUG_CLAMP_LAST_CONTEXT DEBUG_CLAMP_LAST_CONTEXT was there in the old days to reduce number of contexts in order to ease debugging implementation of context switching, but that's been quite stable during years now. As it is not user selectable, remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/da81837b452e8b9f1657b529b9c3050dc10b9770.1622712515.git.christophe.leroy@csgroup.eu
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dac3db1e |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Remove DEBUG_MAP_CONSISTENCY mmu_context handling has been there for years, so we would know if there was problems with maps. DEBUG_MAP_CONSISTENCY is not user selectable, remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/6fe2b88956db53f8d6ee221525b2c5dc6aec82c6.1622712515.git.christophe.leroy@csgroup.eu
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c13066e5 |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Remove CONFIG_SMP #ifdefery in mmu_context.h Everything can be done even when CONFIG_SMP is not selected. Just use IS_ENABLED() where relevant and rely on GCC to opt out unneeded code and variables when CONFIG_SMP is not set. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/cc13b87b0f750a538621876ecc24c22a07e7c8be.1622712515.git.christophe.leroy@csgroup.eu
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a56ab7c7 |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Convert set_context() to C 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 <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/a5d0759064f3831c6b88af49ef5d3b05ba1c4dad.1622712515.git.christophe.leroy@csgroup.eu
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25910260 |
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03-Jun-2021 |
Christophe Leroy <christophe.leroy@csgroup.eu> |
powerpc/nohash: Refactor update of BDI2000 pointers in switch_mmu_context() Instead of duplicating the update of BDI2000 pointers in set_context(), do it directly from switch_mmu_context(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4c54997edd3548fa54717915e7c6ebaf60f208c0.1622712515.git.christophe.leroy@csgroup.eu
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2874c5fd |
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27-May-2019 |
Thomas Gleixner <tglx@linutronix.de> |
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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27e23b5f |
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29-Mar-2019 |
Christophe Leroy <christophe.leroy@c-s.fr> |
powerpc/mm: Move nohash specifics in subdirectory mm/nohash Many files in arch/powerpc/mm are only for nohash. This patch creates a subdirectory for them. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Shorten new filenames] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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