mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
3a6455d56b
In order to be able to do this, we need to change VM_DATA_DEFAULT_FLAGS and friends and update the architecture-specific definitions also. We then have to update some KSM logic to handle VMA flags, and introduce VMA_STACK_FLAGS to define the vma_flags_t equivalent of VM_STACK_FLAGS. We also introduce two helper functions for use during the time we are converting legacy flags to vma_flags_t values - vma_flags_to_legacy() and legacy_to_vma_flags(). This enables us to iteratively make changes to break these changes up into separate parts. We use these explicitly here to keep VM_STACK_FLAGS around for certain users which need to maintain the legacy vm_flags_t values for the time being. We are no longer able to rely on the simple VM_xxx being set to zero if the feature is not enabled, so in the case of VM_DROPPABLE we introduce VMA_DROPPABLE as the vma_flags_t equivalent, which is set to EMPTY_VMA_FLAGS if the droppable flag is not available. While we're here, we make the description of do_brk_flags() into a kdoc comment, as it almost was already. We use vma_flags_to_legacy() to not need to update the vm_get_page_prot() logic as this time. Note that in create_init_stack_vma() we have to replace the BUILD_BUG_ON() with a VM_WARN_ON_ONCE() as the tested values are no longer build time available. We also update mprotect_fixup() to use VMA flags where possible, though we have to live with a little duplication between vm_flags_t and vma_flags_t values for the time being until further conversions are made. While we're here, update VM_SPECIAL to be defined in terms of VMA_SPECIAL_FLAGS now we have vma_flags_to_legacy(). Finally, we update the VMA tests to reflect these changes. Link: https://lkml.kernel.org/r/d02e3e45d9a33d7904b149f5604904089fd640ae.1774034900.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> [SELinux] Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Ondrej Mosnacek <omosnace@redhat.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
#ifndef _ASM_POWERPC_PAGE_64_H
|
|
#define _ASM_POWERPC_PAGE_64_H
|
|
|
|
/*
|
|
* Copyright (C) 2001 PPC64 Team, IBM Corp
|
|
*/
|
|
|
|
#include <asm/asm-const.h>
|
|
|
|
/*
|
|
* We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
|
|
* specific, every notion of page number shared with the firmware, TCEs,
|
|
* iommu, etc... still uses a page size of 4K.
|
|
*/
|
|
#define HW_PAGE_SHIFT 12
|
|
#define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT)
|
|
#define HW_PAGE_MASK (~(HW_PAGE_SIZE-1))
|
|
|
|
/*
|
|
* PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
|
|
* HW_PAGE_SHIFT, that is 4K pages.
|
|
*/
|
|
#define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT)
|
|
|
|
/* Segment size; normal 256M segments */
|
|
#define SID_SHIFT 28
|
|
#define SID_MASK ASM_CONST(0xfffffffff)
|
|
#define ESID_MASK 0xfffffffff0000000UL
|
|
#define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
|
|
|
|
/* 1T segments */
|
|
#define SID_SHIFT_1T 40
|
|
#define SID_MASK_1T 0xffffffUL
|
|
#define ESID_MASK_1T 0xffffff0000000000UL
|
|
#define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
|
|
|
|
#ifndef __ASSEMBLER__
|
|
#include <asm/cache.h>
|
|
|
|
typedef unsigned long pte_basic_t;
|
|
|
|
static inline void clear_page(void *addr)
|
|
{
|
|
unsigned long iterations;
|
|
unsigned long onex, twox, fourx, eightx;
|
|
|
|
iterations = ppc64_caches.l1d.blocks_per_page / 8;
|
|
|
|
/*
|
|
* Some verisions of gcc use multiply instructions to
|
|
* calculate the offsets so lets give it a hand to
|
|
* do better.
|
|
*/
|
|
onex = ppc64_caches.l1d.block_size;
|
|
twox = onex << 1;
|
|
fourx = onex << 2;
|
|
eightx = onex << 3;
|
|
|
|
asm volatile(
|
|
"mtctr %1 # clear_page\n\
|
|
.balign 16\n\
|
|
1: dcbz 0,%0\n\
|
|
dcbz %3,%0\n\
|
|
dcbz %4,%0\n\
|
|
dcbz %5,%0\n\
|
|
dcbz %6,%0\n\
|
|
dcbz %7,%0\n\
|
|
dcbz %8,%0\n\
|
|
dcbz %9,%0\n\
|
|
add %0,%0,%10\n\
|
|
bdnz+ 1b"
|
|
: "=&r" (addr)
|
|
: "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
|
|
"b" (twox+onex), "b" (fourx), "b" (fourx+onex),
|
|
"b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
|
|
: "ctr", "memory");
|
|
}
|
|
|
|
extern void copy_page(void *to, void *from);
|
|
|
|
/* Log 2 of page table size */
|
|
extern u64 ppc64_pft_size;
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#define VMA_DATA_DEFAULT_FLAGS \
|
|
(is_32bit_task() ? \
|
|
VMA_DATA_DEFAULT_FLAGS32 : VMA_DATA_DEFAULT_FLAGS64)
|
|
|
|
/*
|
|
* This is the default if a program doesn't have a PT_GNU_STACK
|
|
* program header entry. The PPC64 ELF ABI has a non executable stack
|
|
* stack by default, so in the absence of a PT_GNU_STACK program header
|
|
* we turn execute permission off.
|
|
*/
|
|
#define VMA_STACK_DEFAULT_FLAGS32 VMA_DATA_FLAGS_EXEC
|
|
#define VMA_STACK_DEFAULT_FLAGS64 VMA_DATA_FLAGS_NON_EXEC
|
|
|
|
#define VMA_STACK_DEFAULT_FLAGS \
|
|
(is_32bit_task() ? \
|
|
VMA_STACK_DEFAULT_FLAGS32 : VMA_STACK_DEFAULT_FLAGS64)
|
|
|
|
#include <asm-generic/getorder.h>
|
|
|
|
#endif /* _ASM_POWERPC_PAGE_64_H */
|