cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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context_tracking.h (3371B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_CONTEXT_TRACKING_H
      3#define _LINUX_CONTEXT_TRACKING_H
      4
      5#include <linux/sched.h>
      6#include <linux/vtime.h>
      7#include <linux/context_tracking_state.h>
      8#include <linux/instrumentation.h>
      9
     10#include <asm/ptrace.h>
     11
     12
     13#ifdef CONFIG_CONTEXT_TRACKING
     14extern void context_tracking_cpu_set(int cpu);
     15
     16/* Called with interrupts disabled.  */
     17extern void __context_tracking_enter(enum ctx_state state);
     18extern void __context_tracking_exit(enum ctx_state state);
     19
     20extern void context_tracking_enter(enum ctx_state state);
     21extern void context_tracking_exit(enum ctx_state state);
     22extern void context_tracking_user_enter(void);
     23extern void context_tracking_user_exit(void);
     24
     25static inline void user_enter(void)
     26{
     27	if (context_tracking_enabled())
     28		context_tracking_enter(CONTEXT_USER);
     29
     30}
     31static inline void user_exit(void)
     32{
     33	if (context_tracking_enabled())
     34		context_tracking_exit(CONTEXT_USER);
     35}
     36
     37/* Called with interrupts disabled.  */
     38static __always_inline void user_enter_irqoff(void)
     39{
     40	if (context_tracking_enabled())
     41		__context_tracking_enter(CONTEXT_USER);
     42
     43}
     44static __always_inline void user_exit_irqoff(void)
     45{
     46	if (context_tracking_enabled())
     47		__context_tracking_exit(CONTEXT_USER);
     48}
     49
     50static inline enum ctx_state exception_enter(void)
     51{
     52	enum ctx_state prev_ctx;
     53
     54	if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) ||
     55	    !context_tracking_enabled())
     56		return 0;
     57
     58	prev_ctx = this_cpu_read(context_tracking.state);
     59	if (prev_ctx != CONTEXT_KERNEL)
     60		context_tracking_exit(prev_ctx);
     61
     62	return prev_ctx;
     63}
     64
     65static inline void exception_exit(enum ctx_state prev_ctx)
     66{
     67	if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) &&
     68	    context_tracking_enabled()) {
     69		if (prev_ctx != CONTEXT_KERNEL)
     70			context_tracking_enter(prev_ctx);
     71	}
     72}
     73
     74static __always_inline bool context_tracking_guest_enter(void)
     75{
     76	if (context_tracking_enabled())
     77		__context_tracking_enter(CONTEXT_GUEST);
     78
     79	return context_tracking_enabled_this_cpu();
     80}
     81
     82static __always_inline void context_tracking_guest_exit(void)
     83{
     84	if (context_tracking_enabled())
     85		__context_tracking_exit(CONTEXT_GUEST);
     86}
     87
     88/**
     89 * ct_state() - return the current context tracking state if known
     90 *
     91 * Returns the current cpu's context tracking state if context tracking
     92 * is enabled.  If context tracking is disabled, returns
     93 * CONTEXT_DISABLED.  This should be used primarily for debugging.
     94 */
     95static __always_inline enum ctx_state ct_state(void)
     96{
     97	return context_tracking_enabled() ?
     98		this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
     99}
    100#else
    101static inline void user_enter(void) { }
    102static inline void user_exit(void) { }
    103static inline void user_enter_irqoff(void) { }
    104static inline void user_exit_irqoff(void) { }
    105static inline enum ctx_state exception_enter(void) { return 0; }
    106static inline void exception_exit(enum ctx_state prev_ctx) { }
    107static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
    108static __always_inline bool context_tracking_guest_enter(void) { return false; }
    109static inline void context_tracking_guest_exit(void) { }
    110
    111#endif /* !CONFIG_CONTEXT_TRACKING */
    112
    113#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
    114
    115#ifdef CONFIG_CONTEXT_TRACKING_FORCE
    116extern void context_tracking_init(void);
    117#else
    118static inline void context_tracking_init(void) { }
    119#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
    120
    121#endif