forked from mirrors/linux
e25b694bf1
Yes, it really did out-of-line this.... vmlinux.o: warning: objtool: vmx_vcpu_enter_exit()+0x31: call to context_tracking_guest_enter() leaves .noinstr.text section 000000000019f660 <context_tracking_guest_enter>: 19f660: e8 00 00 00 00 callq 19f665 <context_tracking_guest_enter+0x5> 19f661: R_X86_64_PLT32 __sanitizer_cov_trace_pc-0x4 19f665: 31 c0 xor %eax,%eax 19f667: c3 retq Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20210624095148.003928226@infradead.org
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_CONTEXT_TRACKING_H
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#define _LINUX_CONTEXT_TRACKING_H
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#include <linux/sched.h>
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#include <linux/vtime.h>
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#include <linux/context_tracking_state.h>
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#include <linux/instrumentation.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_CONTEXT_TRACKING
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extern void context_tracking_cpu_set(int cpu);
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/* Called with interrupts disabled. */
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extern void __context_tracking_enter(enum ctx_state state);
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extern void __context_tracking_exit(enum ctx_state state);
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extern void context_tracking_enter(enum ctx_state state);
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extern void context_tracking_exit(enum ctx_state state);
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extern void context_tracking_user_enter(void);
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extern void context_tracking_user_exit(void);
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static inline void user_enter(void)
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{
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if (context_tracking_enabled())
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context_tracking_enter(CONTEXT_USER);
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}
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static inline void user_exit(void)
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{
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if (context_tracking_enabled())
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context_tracking_exit(CONTEXT_USER);
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}
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/* Called with interrupts disabled. */
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static __always_inline void user_enter_irqoff(void)
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{
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if (context_tracking_enabled())
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__context_tracking_enter(CONTEXT_USER);
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}
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static __always_inline void user_exit_irqoff(void)
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{
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if (context_tracking_enabled())
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__context_tracking_exit(CONTEXT_USER);
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}
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static inline enum ctx_state exception_enter(void)
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{
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enum ctx_state prev_ctx;
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if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) ||
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!context_tracking_enabled())
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return 0;
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prev_ctx = this_cpu_read(context_tracking.state);
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if (prev_ctx != CONTEXT_KERNEL)
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context_tracking_exit(prev_ctx);
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return prev_ctx;
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}
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static inline void exception_exit(enum ctx_state prev_ctx)
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{
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if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) &&
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context_tracking_enabled()) {
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if (prev_ctx != CONTEXT_KERNEL)
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context_tracking_enter(prev_ctx);
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}
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}
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static __always_inline bool context_tracking_guest_enter(void)
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{
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if (context_tracking_enabled())
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__context_tracking_enter(CONTEXT_GUEST);
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return context_tracking_enabled_this_cpu();
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}
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static __always_inline void context_tracking_guest_exit(void)
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{
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if (context_tracking_enabled())
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__context_tracking_exit(CONTEXT_GUEST);
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}
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/**
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* ct_state() - return the current context tracking state if known
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*
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* Returns the current cpu's context tracking state if context tracking
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* is enabled. If context tracking is disabled, returns
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* CONTEXT_DISABLED. This should be used primarily for debugging.
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*/
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static __always_inline enum ctx_state ct_state(void)
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{
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return context_tracking_enabled() ?
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this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
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}
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#else
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static inline void user_enter(void) { }
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static inline void user_exit(void) { }
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static inline void user_enter_irqoff(void) { }
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static inline void user_exit_irqoff(void) { }
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static inline enum ctx_state exception_enter(void) { return 0; }
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static inline void exception_exit(enum ctx_state prev_ctx) { }
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static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
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static __always_inline bool context_tracking_guest_enter(void) { return false; }
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static inline void context_tracking_guest_exit(void) { }
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#endif /* !CONFIG_CONTEXT_TRACKING */
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#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
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#ifdef CONFIG_CONTEXT_TRACKING_FORCE
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extern void context_tracking_init(void);
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#else
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static inline void context_tracking_init(void) { }
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#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
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#endif
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