context_tracking: Make guest_enter/exit() .noinstr ready

Force inlining of the helpers and mark the instrumentable parts
accordingly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134341.672545766@linutronix.de

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 8150f5a..8cac62e 100644 (file)
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -101,12 +101,14 @@ static inline void context_tracking_init(void) { }
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 /* must be called with irqs disabled */
-static inline void guest_enter_irqoff(void)
+static __always_inline void guest_enter_irqoff(void)
 {
+       instrumentation_begin();
        if (vtime_accounting_enabled_this_cpu())
                vtime_guest_enter(current);
        else
                current->flags |= PF_VCPU;
+       instrumentation_end();
 
        if (context_tracking_enabled())
                __context_tracking_enter(CONTEXT_GUEST);
@@ -118,39 +120,48 @@ static inline void guest_enter_irqoff(void)
         * one time slice). Lets treat guest mode as quiescent state, just like
         * we do with user-mode execution.
         */
-       if (!context_tracking_enabled_this_cpu())
+       if (!context_tracking_enabled_this_cpu()) {
+               instrumentation_begin();
                rcu_virt_note_context_switch(smp_processor_id());
+               instrumentation_end();
+       }
 }
 
-static inline void guest_exit_irqoff(void)
+static __always_inline void guest_exit_irqoff(void)
 {
        if (context_tracking_enabled())
                __context_tracking_exit(CONTEXT_GUEST);
 
+       instrumentation_begin();
        if (vtime_accounting_enabled_this_cpu())
                vtime_guest_exit(current);
        else
                current->flags &= ~PF_VCPU;
+       instrumentation_end();
 }
 
 #else
-static inline void guest_enter_irqoff(void)
+static __always_inline void guest_enter_irqoff(void)
 {
        /*
         * This is running in ioctl context so its safe
         * to assume that it's the stime pending cputime
         * to flush.
         */
+       instrumentation_begin();
        vtime_account_kernel(current);
        current->flags |= PF_VCPU;
        rcu_virt_note_context_switch(smp_processor_id());
+       instrumentation_end();
 }
 
-static inline void guest_exit_irqoff(void)
+static __always_inline void guest_exit_irqoff(void)
 {
+       instrumentation_begin();
        /* Flush the guest cputime we spent on the guest */
        vtime_account_kernel(current);
        current->flags &= ~PF_VCPU;
+       instrumentation_end();
 }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */