From: Wanpeng Li wanpengli@tencent.com
commit 88d8220bbf06dd8045b2ac4be1046290eaa7773a 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 --- include/linux/context_tracking.h | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
--- a/include/linux/context_tracking.h +++ b/include/linux/context_tracking.h @@ -137,15 +137,20 @@ static __always_inline void context_trac __context_tracking_exit(CONTEXT_GUEST); }
-static __always_inline void guest_exit_irqoff(void) +static __always_inline void vtime_account_guest_exit(void) { - context_tracking_guest_exit(); - - instrumentation_begin(); if (vtime_accounting_enabled_this_cpu()) vtime_guest_exit(current); else current->flags &= ~PF_VCPU; +} + +static __always_inline void guest_exit_irqoff(void) +{ + context_tracking_guest_exit(); + + instrumentation_begin(); + vtime_account_guest_exit(); instrumentation_end(); }
@@ -166,12 +171,17 @@ static __always_inline void guest_enter_
static __always_inline void context_tracking_guest_exit(void) { }
+static __always_inline void vtime_account_guest_exit(void) +{ + vtime_account_kernel(current); + current->flags &= ~PF_VCPU; +} + 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; + vtime_account_guest_exit(); instrumentation_end(); } #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */