cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kfence.h (1148B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2
      3#ifndef _ASM_S390_KFENCE_H
      4#define _ASM_S390_KFENCE_H
      5
      6#include <linux/mm.h>
      7#include <linux/kfence.h>
      8#include <asm/set_memory.h>
      9#include <asm/page.h>
     10
     11void __kernel_map_pages(struct page *page, int numpages, int enable);
     12
     13static __always_inline bool arch_kfence_init_pool(void)
     14{
     15	return true;
     16}
     17
     18#define arch_kfence_test_address(addr) ((addr) & PAGE_MASK)
     19
     20/*
     21 * Do not split kfence pool to 4k mapping with arch_kfence_init_pool(),
     22 * but earlier where page table allocations still happen with memblock.
     23 * Reason is that arch_kfence_init_pool() gets called when the system
     24 * is still in a limbo state - disabling and enabling bottom halves is
     25 * not yet allowed, but that is what our page_table_alloc() would do.
     26 */
     27static __always_inline void kfence_split_mapping(void)
     28{
     29#ifdef CONFIG_KFENCE
     30	unsigned long pool_pages = KFENCE_POOL_SIZE >> PAGE_SHIFT;
     31
     32	set_memory_4k((unsigned long)__kfence_pool, pool_pages);
     33#endif
     34}
     35
     36static inline bool kfence_protect_page(unsigned long addr, bool protect)
     37{
     38	__kernel_map_pages(virt_to_page(addr), 1, !protect);
     39	return true;
     40}
     41
     42#endif /* _ASM_S390_KFENCE_H */