mirror of https://gitee.com/openkylin/linux.git
29 lines
744 B
C
29 lines
744 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SYNC_CORE_H
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#define _ASM_X86_SYNC_CORE_H
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#include <linux/preempt.h>
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#include <asm/processor.h>
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#include <asm/cpufeature.h>
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/*
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* Ensure that a core serializing instruction is issued before returning
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* to user-mode. x86 implements return to user-space through sysexit,
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* sysrel, and sysretq, which are not core serializing.
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*/
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static inline void sync_core_before_usermode(void)
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{
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/* With PTI, we unconditionally serialize before running user code. */
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if (static_cpu_has(X86_FEATURE_PTI))
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return;
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/*
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* Return from interrupt and NMI is done through iret, which is core
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* serializing.
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*/
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if (in_irq() || in_nmi())
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return;
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sync_core();
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}
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#endif /* _ASM_X86_SYNC_CORE_H */
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