Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* KFENCE support for LoongArch.
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*
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* Author: Enze Li <lienze@kylinos.cn>
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* Copyright (C) 2022-2023 KylinSoft Corporation.
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*/
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#ifndef _ASM_LOONGARCH_KFENCE_H
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#define _ASM_LOONGARCH_KFENCE_H
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#include <linux/kfence.h>
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#include <linux/vmalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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static inline bool arch_kfence_init_pool(void)
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{
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int err;
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char *kaddr, *vaddr;
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char *kfence_pool = __kfence_pool;
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struct vm_struct *area;
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area = __get_vm_area_caller(KFENCE_POOL_SIZE, VM_IOREMAP,
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KFENCE_AREA_START, KFENCE_AREA_END,
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__builtin_return_address(0));
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if (!area)
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return false;
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__kfence_pool = (char *)area->addr;
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err = ioremap_page_range((unsigned long)__kfence_pool,
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(unsigned long)__kfence_pool + KFENCE_POOL_SIZE,
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virt_to_phys((void *)kfence_pool), PAGE_KERNEL);
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if (err) {
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free_vm_area(area);
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__kfence_pool = kfence_pool;
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return false;
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}
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kaddr = kfence_pool;
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vaddr = __kfence_pool;
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while (kaddr < kfence_pool + KFENCE_POOL_SIZE) {
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set_page_address(virt_to_page(kaddr), vaddr);
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kaddr += PAGE_SIZE;
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vaddr += PAGE_SIZE;
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}
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return true;
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}
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/* Protect the given page and flush TLB. */
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static inline bool kfence_protect_page(unsigned long addr, bool protect)
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{
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pte_t *pte = virt_to_kpte(addr);
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if (WARN_ON(!pte) || pte_none(ptep_get(pte)))
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return false;
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if (protect)
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set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~(_PAGE_VALID | _PAGE_PRESENT)));
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else
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set_pte(pte, __pte(pte_val(ptep_get(pte)) | (_PAGE_VALID | _PAGE_PRESENT)));
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preempt_disable();
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local_flush_tlb_one(addr);
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preempt_enable();
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return true;
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}
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#endif /* _ASM_LOONGARCH_KFENCE_H */
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