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Date: Sun, 17 Jul 2022 23:18:56 +0800
From: Tao Zhou <tao.zhou@...ux.dev>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>,
Jonathan Corbet <corbet@....net>,
Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Marco Elver <elver@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Shuah Khan <skhan@...uxfoundation.org>,
Gabriele Paoloni <gpaoloni@...hat.com>,
Juri Lelli <juri.lelli@...hat.com>,
Clark Williams <williams@...hat.com>,
Randy Dunlap <rdunlap@...radead.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-devel@...r.kernel.org, Tao Zhou <tao.zhou@...ux.dev>
Subject: Re: [PATCH V5 04/16] rv/include: Add deterministic automata monitor
definition via C macros
On Wed, Jul 13, 2022 at 11:17:20PM +0200, Daniel Bristot de Oliveira wrote:
> In Linux terms, the runtime verification monitors are encapsulated
> inside the "RV monitor" abstraction. The "RV monitor" includes a set
> of instances of the monitor (per-cpu monitor, per-task monitor, and
> so on), the helper functions that glue the monitor to the system
> reference model, and the trace output as a reaction for event parsing
> and exceptions, as depicted below:
>
> Linux +----- RV Monitor ----------------------------------+ Formal
> Realm | | Realm
> +-------------------+ +----------------+ +-----------------+
> | Linux kernel | | Monitor | | Reference |
> | Tracing | -> | Instance(s) | <- | Model |
> | (instrumentation) | | (verification) | | (specification) |
> +-------------------+ +----------------+ +-----------------+
> | | |
> | V |
> | +----------+ |
> | | Reaction | |
> | +--+--+--+-+ |
> | | | | |
> | | | +-> trace output ? |
> +------------------------|--|----------------------+
> | +----> panic ?
> +-------> <user-specified>
>
> Add the rv/da_monitor.h, enabling automatic code generation for the
> *Monitor Instance(s)* using C macros, and code to support it.
>
> The benefits of the usage of macro for monitor synthesis are 3-fold as it:
>
> - Reduces the code duplication;
> - Facilitates the bug fix/improvement;
> - Avoids the case of developers changing the core of the monitor code
> to manipulate the model in a (let's say) non-standard way.
>
> This initial implementation presents three different types of monitor
> instances:
>
> - DECLARE_DA_MON_GLOBAL(name, type)
> - DECLARE_DA_MON_PER_CPU(name, type)
> - DECLARE_DA_MON_PER_TASK(name, type)
>
> The first declares the functions for a global deterministic automata monitor,
> the second for monitors with per-cpu instances, and the third with per-task
> instances.
>
> Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marco Elver <elver@...gle.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: Gabriele Paoloni <gpaoloni@...hat.com>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: Tao Zhou <tao.zhou@...ux.dev>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
> include/linux/rv.h | 2 +
> include/rv/da_monitor.h | 521 ++++++++++++++++++++++++++++++++++++++
> include/rv/rv.h | 9 +
> include/trace/events/rv.h | 120 +++++++++
> kernel/fork.c | 14 +
> kernel/trace/rv/Kconfig | 14 +
> kernel/trace/rv/rv.c | 5 +
> 7 files changed, 685 insertions(+)
> create mode 100644 include/rv/da_monitor.h
> create mode 100644 include/trace/events/rv.h
>
> diff --git a/include/linux/rv.h b/include/linux/rv.h
> index 88d28d207f3a..bdefdff12a1f 100644
> --- a/include/linux/rv.h
> +++ b/include/linux/rv.h
> @@ -7,6 +7,8 @@
> #ifndef _LINUX_RV_H
> #define _LINUX_RV_H
>
> +#define MAX_DA_NAME_LEN 24
> +
> struct rv_reactor {
> char *name;
> char *description;
> diff --git a/include/rv/da_monitor.h b/include/rv/da_monitor.h
> new file mode 100644
> index 000000000000..d21045e6c5fc
> --- /dev/null
> +++ b/include/rv/da_monitor.h
> @@ -0,0 +1,521 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@...nel.org>
> + *
> + * Deterministic automata (DA) monitor functions, to be used together
> + * with automata models in C generated by the dot2k tool.
> + *
> + * The dot2k tool is available at tools/verification/dot2k/
> + */
> +
> +#include <rv/automata.h>
> +#include <linux/rv.h>
> +
> +/*
> + * Generic helpers for all types of deterministic automata monitors.
> + */
> +#define DECLARE_DA_MON_GENERIC_HELPERS(name, type) \
> +static char REACT_MSG[1024]; \
> + \
> +static inline char *format_react_msg(type curr_state, type event) \
> +{ \
> + snprintf(REACT_MSG, 1024, \
> + "rv: monitor %s does not allow event %s on state %s\n", \
> + #name, \
> + model_get_event_name_##name(event), \
> + model_get_state_name_##name(curr_state)); \
> + return REACT_MSG; \
> +} \
> + \
> +static void cond_react(char *msg) \
> +{ \
> + if (rv_##name.react) \
> + rv_##name.react(msg); \
> +} \
> + \
> +/* \
> + * da_monitor_reset_##name - reset a monitor and setting it to init state \
> + */ \
> +static inline void da_monitor_reset_##name(struct da_monitor *da_mon) \
> +{ \
> + da_mon->monitoring = 0; \
> + da_mon->curr_state = model_get_init_state_##name(); \
> +} \
> + \
> +/* \
> + * da_monitor_curr_state_##name - return the current state \
> + */ \
> +static inline type da_monitor_curr_state_##name(struct da_monitor *da_mon) \
> +{ \
> + return da_mon->curr_state; \
> +} \
> + \
> +/* \
> + * da_monitor_set_state_##name - set the new current state \
> + */ \
> +static inline void \
> +da_monitor_set_state_##name(struct da_monitor *da_mon, enum states_##name state)\
> +{ \
> + da_mon->curr_state = state; \
> +} \
> + \
> +/* \
> + * da_monitor_start_##name - start monitoring \
> + * \
> + * The monitor will ignore all events until monitoring is set to true. This \
> + * function needs to be called to tell the monitor to start monitoring. \
> + */ \
> +static inline void da_monitor_start_##name(struct da_monitor *da_mon) \
> +{ \
> + da_mon->monitoring = 1; \
> +} \
> + \
> +/* \
> + * da_monitoring_##name - returns true if the monitor is processing events \
> + */ \
> +static inline bool da_monitoring_##name(struct da_monitor *da_mon) \
> +{ \
> + return da_mon->monitoring; \
> +}
> +
> +
> +/*
> + * Event handler for implicit monitors. Implicit monitor is the one which the
> + * handler does not need to specify which da_monitor to manipulate. Examples
> + * of implicit monitor are the per_cpu or the global ones.
> + */
> +#define DECLARE_DA_MON_MODEL_HANDLER_IMPLICIT(name, type) \
> +static inline bool \
> +da_event_##name(struct da_monitor *da_mon, enum events_##name event) \
> +{ \
> + type curr_state = da_monitor_curr_state_##name(da_mon); \
> + type next_state = model_get_next_state_##name(curr_state, event); \
> + \
> + if (next_state != INVALID_STATE) { \
> + da_monitor_set_state_##name(da_mon, next_state); \
> + \
> + trace_event_##name(model_get_state_name_##name(curr_state), \
> + model_get_event_name_##name(event), \
> + model_get_state_name_##name(next_state), \
> + model_is_final_state_##name(next_state)); \
> + \
> + return true; \
> + } \
> + \
> + if (reacting_on) \
> + cond_react(format_react_msg(curr_state, event)); \
> + \
> + trace_error_##name(model_get_state_name_##name(curr_state), \
> + model_get_event_name_##name(event)); \
> + \
> + return false; \
> +} \
> +
> +/*
> + * Event handler for per_task monitors.
> + */
> +#define DECLARE_DA_MON_MODEL_HANDLER_PER_TASK(name, type) \
> +static inline type \
> +da_event_##name(struct da_monitor *da_mon, struct task_struct *tsk, \
> + enum events_##name event) \
> +{ \
> + type curr_state = da_monitor_curr_state_##name(da_mon); \
> + type next_state = model_get_next_state_##name(curr_state, event); \
> + \
> + if (next_state != INVALID_STATE) { \
> + da_monitor_set_state_##name(da_mon, next_state); \
> + \
> + trace_event_##name(tsk->pid, \
> + model_get_state_name_##name(curr_state), \
> + model_get_event_name_##name(event), \
> + model_get_state_name_##name(next_state), \
> + model_is_final_state_##name(next_state)); \
> + \
> + return true; \
> + } \
> + \
> + if (reacting_on) \
> + cond_react(format_react_msg(curr_state, event)); \
> + \
> + trace_error_##name(tsk->pid, \
> + model_get_state_name_##name(curr_state), \
> + model_get_event_name_##name(event)); \
> + \
> + return false; \
> +}
> +
> +/*
> + * Functions to define, init and get a global monitor.
> + */
> +#define DECLARE_DA_MON_INIT_GLOBAL(name, type) \
> + \
> +/* \
> + * global monitor (a single variable) \
> + */ \
> +static struct da_monitor da_mon_##name; \
> + \
> +/* \
> + * da_get_monitor_##name - return the global monitor address \
> + */ \
> +static struct da_monitor *da_get_monitor_##name(void) \
> +{ \
> + return &da_mon_##name; \
> +} \
> + \
> +/* \
> + * da_monitor_reset_all_##name - reset the single monitor \
> + */ \
> +static void da_monitor_reset_all_##name(void) \
> +{ \
> + da_monitor_reset_##name(&da_mon_##name); \
> +} \
> + \
> +/* \
> + * da_monitor_init_##name - initialize a monitor \
> + */ \
> +static inline int da_monitor_init_##name(void) \
> +{ \
> + struct da_monitor *da_mon = &da_mon_##name; \
> + da_mon->curr_state = model_get_init_state_##name(); \
> + da_mon->monitoring = 0; \
> + return 0; \
> +} \
> + \
> +/* \
> + * da_monitor_destroy_##name - destroy the monitor \
> + */ \
> +static inline void da_monitor_destroy_##name(void) \
> +{ \
> + return; \
> +}
> +
> +/*
> + * Functions to define, init and get a per-cpu monitor.
> + */
> +#define DECLARE_DA_MON_INIT_PER_CPU(name, type) \
> + \
> +/* \
> + * per-cpu monitor variables \
> + */ \
> +DEFINE_PER_CPU(struct da_monitor, da_mon_##name); \
> + \
> +/* \
> + * da_get_monitor_##name - return current CPU monitor address \
> + */ \
> +static struct da_monitor *da_get_monitor_##name(void) \
> +{ \
> + return this_cpu_ptr(&da_mon_##name); \
> +} \
> + \
> +/* \
> + * da_monitor_reset_all_##name - reset all CPUs' monitor \
> + */ \
> +static void da_monitor_reset_all_##name(void) \
> +{ \
> + struct da_monitor *da_mon; \
> + int cpu; \
> + for_each_cpu(cpu, cpu_online_mask) { \
> + da_mon = per_cpu_ptr(&da_mon_##name, cpu); \
> + da_monitor_reset_##name(da_mon); \
> + } \
> +} \
> + \
> +/* \
> + * da_monitor_init_##name - initialize all CPUs' monitor \
> + */ \
> +static inline int da_monitor_init_##name(void) \
> +{ \
> + struct da_monitor *da_mon; \
> + int cpu; \
> + for_each_cpu(cpu, cpu_online_mask) { \
> + da_mon = per_cpu_ptr(&da_mon_##name, cpu); \
> + da_mon->curr_state = model_get_init_state_##name(); \
> + da_mon->monitoring = 0; \
> + } \
> + return 0; \
> +} \
> + \
> +/* \
> + * da_monitor_destroy_##name - destroy the monitor \
> + */ \
> +static inline void da_monitor_destroy_##name(void) \
> +{ \
> + return; \
> +}
> +
> +/*
> + * Functions to define, init and get a per-task monitor.
> + */
> +#define DECLARE_DA_MON_INIT_PER_TASK(name, type) \
> + \
> +/* \
> + * The per-task monitor is stored a vector in the task struct. This variable \
> + * stores the position on the vector reserved for this monitor. \
> + */ \
> +static int task_mon_slot_##name = RV_PER_TASK_MONITOR_INIT; \
In patch1, RV_PER_TASK_MONITOR_INIT is defined as:
#define RV_PER_TASK_MONITORS 1
#define RV_PER_TASK_MONITOR_INIT (RV_PER_TASK_MONITORS)
RV_PER_TASK_MONITOR_INIT is 1 now, seems not the index of the first only
element in vector. Now no map here, one task has one monitor though if I
am not wrong.
So task_mon_slot_##name must be defined to the index of first element.
Modify the macro definition of RV_PER_TASK_MONITOR_INIT to the index of
first element in vector.
#define RV_PER_TASK_MONITOR_INIT (RV_PER_TASK_MONITORS) - 1
If there are more monitors per task in the furture, like you say, dynamic
allocation and mapping should be used. But I don't know.
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