60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_KMSAN_H
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#define _ASM_S390_KMSAN_H
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#include <asm/lowcore.h>
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#include <asm/page.h>
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#include <linux/kmsan.h>
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#include <linux/mmzone.h>
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#include <linux/stddef.h>
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#ifndef MODULE
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static inline bool is_lowcore_addr(void *addr)
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{
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return addr >= (void *)get_lowcore() &&
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addr < (void *)(get_lowcore() + 1);
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}
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static inline void *arch_kmsan_get_meta_or_null(void *addr, bool is_origin)
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{
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if (is_lowcore_addr(addr)) {
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/*
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* Different lowcores accessed via S390_lowcore are described
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* by the same struct page. Resolve the prefix manually in
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* order to get a distinct struct page.
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*/
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addr += (void *)lowcore_ptr[raw_smp_processor_id()] -
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(void *)get_lowcore();
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if (KMSAN_WARN_ON(is_lowcore_addr(addr)))
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return NULL;
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return kmsan_get_metadata(addr, is_origin);
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}
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return NULL;
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}
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static inline bool kmsan_virt_addr_valid(void *addr)
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{
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bool ret;
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/*
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* pfn_valid() relies on RCU, and may call into the scheduler on exiting
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* the critical section. However, this would result in recursion with
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* KMSAN. Therefore, disable preemption here, and re-enable preemption
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* below while suppressing reschedules to avoid recursion.
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*
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* Note, this sacrifices occasionally breaking scheduling guarantees.
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* Although, a kernel compiled with KMSAN has already given up on any
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* performance guarantees due to being heavily instrumented.
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*/
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preempt_disable();
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ret = virt_addr_valid(addr);
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preempt_enable_no_resched();
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return ret;
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}
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#endif /* !MODULE */
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#endif /* _ASM_S390_KMSAN_H */
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