1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SYNC_CORE_H
3 #define _ASM_X86_SYNC_CORE_H
5 #include <linux/preempt.h>
6 #include <asm/processor.h>
7 #include <asm/cpufeature.h>
10 * Ensure that a core serializing instruction is issued before returning
11 * to user-mode. x86 implements return to user-space through sysexit,
12 * sysrel, and sysretq, which are not core serializing.
14 static inline void sync_core_before_usermode(void)
16 /* With PTI, we unconditionally serialize before running user code. */
17 if (static_cpu_has(X86_FEATURE_PTI))
21 * Even if we're in an interrupt, we might reschedule before returning,
22 * in which case we could switch to a different thread in the same mm
23 * and return using SYSRET or SYSEXIT. Instead of trying to keep
24 * track of our need to sync the core, just sync right away.
29 #endif /* _ASM_X86_SYNC_CORE_H */