lkml.org 
[lkml]   [2020]   [May]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch V4 part 2 16/18] 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>
Cc: Paolo Bonzini <pbonzini@redhat.com>
---
include/linux/context_tracking.h | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -101,12 +101,14 @@ static inline void context_tracking_init

#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)
{
+ instr_begin();
if (vtime_accounting_enabled_this_cpu())
vtime_guest_enter(current);
else
current->flags |= PF_VCPU;
+ instr_end();

if (context_tracking_enabled())
__context_tracking_enter(CONTEXT_GUEST);
@@ -118,39 +120,48 @@ static inline void guest_enter_irqoff(vo
* 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()) {
+ instr_begin();
rcu_virt_note_context_switch(smp_processor_id());
+ instr_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);

+ instr_begin();
if (vtime_accounting_enabled_this_cpu())
vtime_guest_exit(current);
else
current->flags &= ~PF_VCPU;
+ instr_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.
*/
+ instr_begin();
vtime_account_kernel(current);
current->flags |= PF_VCPU;
rcu_virt_note_context_switch(smp_processor_id());
+ instr_end();
}

-static inline void guest_exit_irqoff(void)
+static __always_inline void guest_exit_irqoff(void)
{
+ instr_begin();
/* Flush the guest cputime we spent on the guest */
vtime_account_kernel(current);
current->flags &= ~PF_VCPU;
+ instr_end();
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */

\
 
 \ /
  Last update: 2020-05-05 16:15    [W:0.614 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site