[Devel] [PATCH RHEL7 COMMIT] ms/KVM: i8254: add kvm_pit_reset_reinject

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-327.36.1.vz7.20.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.36.1.vz7.20.14
------>
commit aaf5cfc9385cecf85abf2ebfa7cf55a99aec920e
Author: Radim Krčmář <rkrcmar at redhat.com>
Date:   Fri Dec 9 17:23:23 2016 +0400

    ms/KVM: i8254: add kvm_pit_reset_reinject
    
    pit_state.pending and pit_state.irq_ack are always reset at the same
    time.  Create a function for them.
    
    Signed-off-by: Radim Krčmář <rkrcmar at redhat.com>
    Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
    
    ms commit fd700a00dc2e821be92b0b56fd5d8ebf8c63f9ba
    ("KVM: i8254: add kvm_pit_reset_reinject")
    
    Fixes https://jira.sw.ru/browse/PSBM-56972
    Signed-off-by: Evgeny Yakovlev <eyakovlev at virtuozzo.com>
---
 arch/x86/kvm/i8254.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index b1bdc4f..4dedeb0 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -320,6 +320,12 @@ static enum hrtimer_restart pit_timer_fn(struct hrtimer *data)
 		return HRTIMER_NORESTART;
 }
 
+static inline void kvm_pit_reset_reinject(struct kvm_pit *pit)
+{
+	atomic_set(&pit->pit_state.pending, 0);
+	pit->pit_state.irq_ack = 1;
+}
+
 static void create_pit_timer(struct kvm *kvm, u32 val, int is_period)
 {
 	struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;
@@ -341,8 +347,7 @@ static void create_pit_timer(struct kvm *kvm, u32 val, int is_period)
 	ps->timer.function = pit_timer_fn;
 	ps->kvm = ps->pit->kvm;
 
-	atomic_set(&ps->pending, 0);
-	ps->irq_ack = 1;
+	kvm_pit_reset_reinject(ps->pit);
 
 	/*
 	 * Do not allow the guest to program periodic timers with small
@@ -637,18 +642,15 @@ void kvm_pit_reset(struct kvm_pit *pit)
 	}
 	mutex_unlock(&pit->pit_state.lock);
 
-	atomic_set(&pit->pit_state.pending, 0);
-	pit->pit_state.irq_ack = 1;
+	kvm_pit_reset_reinject(pit);
 }
 
 static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask)
 {
 	struct kvm_pit *pit = container_of(kimn, struct kvm_pit, mask_notifier);
 
-	if (!mask) {
-		atomic_set(&pit->pit_state.pending, 0);
-		pit->pit_state.irq_ack = 1;
-	}
+	if (!mask)
+		kvm_pit_reset_reinject(pit);
 }
 
 static const struct kvm_io_device_ops pit_dev_ops = {