a4367bbe86
commit 88d8220bbf upstream.
Provide separate vtime accounting functions for guest exit instead of
open coding the logic within the context tracking code. This will allow
KVM x86 to handle vtime accounting slightly differently when using
tick-based accounting.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20210505002735.1684165-3-seanjc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_CONTEXT_TRACKING_H
|
|
#define _LINUX_CONTEXT_TRACKING_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/vtime.h>
|
|
#include <linux/context_tracking_state.h>
|
|
#include <linux/instrumentation.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
|
|
|
|
#ifdef CONFIG_CONTEXT_TRACKING
|
|
extern void context_tracking_cpu_set(int cpu);
|
|
|
|
/* Called with interrupts disabled. */
|
|
extern void __context_tracking_enter(enum ctx_state state);
|
|
extern void __context_tracking_exit(enum ctx_state state);
|
|
|
|
extern void context_tracking_enter(enum ctx_state state);
|
|
extern void context_tracking_exit(enum ctx_state state);
|
|
extern void context_tracking_user_enter(void);
|
|
extern void context_tracking_user_exit(void);
|
|
|
|
static inline void user_enter(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
context_tracking_enter(CONTEXT_USER);
|
|
|
|
}
|
|
static inline void user_exit(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
context_tracking_exit(CONTEXT_USER);
|
|
}
|
|
|
|
/* Called with interrupts disabled. */
|
|
static __always_inline void user_enter_irqoff(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__context_tracking_enter(CONTEXT_USER);
|
|
|
|
}
|
|
static __always_inline void user_exit_irqoff(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__context_tracking_exit(CONTEXT_USER);
|
|
}
|
|
|
|
static inline enum ctx_state exception_enter(void)
|
|
{
|
|
enum ctx_state prev_ctx;
|
|
|
|
if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) ||
|
|
!context_tracking_enabled())
|
|
return 0;
|
|
|
|
prev_ctx = this_cpu_read(context_tracking.state);
|
|
if (prev_ctx != CONTEXT_KERNEL)
|
|
context_tracking_exit(prev_ctx);
|
|
|
|
return prev_ctx;
|
|
}
|
|
|
|
static inline void exception_exit(enum ctx_state prev_ctx)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) &&
|
|
context_tracking_enabled()) {
|
|
if (prev_ctx != CONTEXT_KERNEL)
|
|
context_tracking_enter(prev_ctx);
|
|
}
|
|
}
|
|
|
|
static __always_inline bool context_tracking_guest_enter(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__context_tracking_enter(CONTEXT_GUEST);
|
|
|
|
return context_tracking_enabled_this_cpu();
|
|
}
|
|
|
|
static __always_inline void context_tracking_guest_exit(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__context_tracking_exit(CONTEXT_GUEST);
|
|
}
|
|
|
|
/**
|
|
* ct_state() - return the current context tracking state if known
|
|
*
|
|
* Returns the current cpu's context tracking state if context tracking
|
|
* is enabled. If context tracking is disabled, returns
|
|
* CONTEXT_DISABLED. This should be used primarily for debugging.
|
|
*/
|
|
static __always_inline enum ctx_state ct_state(void)
|
|
{
|
|
return context_tracking_enabled() ?
|
|
this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
|
|
}
|
|
#else
|
|
static inline void user_enter(void) { }
|
|
static inline void user_exit(void) { }
|
|
static inline void user_enter_irqoff(void) { }
|
|
static inline void user_exit_irqoff(void) { }
|
|
static inline enum ctx_state exception_enter(void) { return 0; }
|
|
static inline void exception_exit(enum ctx_state prev_ctx) { }
|
|
static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
|
|
static inline bool context_tracking_guest_enter(void) { return false; }
|
|
static inline void context_tracking_guest_exit(void) { }
|
|
|
|
#endif /* !CONFIG_CONTEXT_TRACKING */
|
|
|
|
#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
|
|
|
|
#ifdef CONFIG_CONTEXT_TRACKING_FORCE
|
|
extern void context_tracking_init(void);
|
|
#else
|
|
static inline void context_tracking_init(void) { }
|
|
#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
|
|
|
|
#endif
|