]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
set_memory: allow querying whether set_direct_map_*() is actually enabled
authorMike Rapoport <rppt@linux.ibm.com>
Thu, 8 Jul 2021 01:07:59 +0000 (18:07 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 8 Jul 2021 18:48:20 +0000 (11:48 -0700)
commit6d47c23b16aa78ff93a3050ccf4b1bd1c064b8b3
tree159d26d035facafbfec9539a1c3f8ab9f770589b
parent10cc327883919dbd2d77c858a50698622760639d
set_memory: allow querying whether set_direct_map_*() is actually enabled

On arm64, set_direct_map_*() functions may return 0 without actually
changing the linear map.  This behaviour can be controlled using kernel
parameters, so we need a way to determine at runtime whether calls to
set_direct_map_invalid_noflush() and set_direct_map_default_noflush() have
any effect.

Extend set_memory API with can_set_direct_map() function that allows
checking if calling set_direct_map_*() will actually change the page
table, replace several occurrences of open coded checks in arm64 with the
new function and provide a generic stub for architectures that always
modify page tables upon calls to set_direct_map APIs.

[arnd@arndb.de: arm64: kfence: fix header inclusion ]

Link: https://lkml.kernel.org/r/20210518072034.31572-4-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christopher Lameter <cl@linux.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Hagen Paul Pfeifer <hagen@jauu.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tycho Andersen <tycho@tycho.ws>
Cc: Will Deacon <will@kernel.org>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arm64/include/asm/Kbuild
arch/arm64/include/asm/cacheflush.h
arch/arm64/include/asm/kfence.h
arch/arm64/include/asm/set_memory.h [new file with mode: 0644]
arch/arm64/kernel/machine_kexec.c
arch/arm64/mm/mmu.c
arch/arm64/mm/pageattr.c
include/linux/set_memory.h