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