[PATCH v4 1/5] KVM: LAPIC: Make lapic timer unpinned

[Wanpeng Li]

From: Wanpeng Li <wanpen...@tencent.com>

Make lapic timer unpinned when timer is injected by posted-interrupt,
the emulated timer can be offload to the housekeeping cpus, kick after 
setting the pending timer request as alternative to commit 61abdbe0bcc.

Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Radim Krčmář <rkrc...@redhat.com>
Cc: Marcelo Tosatti <mtosa...@redhat.com>
Signed-off-by: Wanpeng Li <wanpen...@tencent.com>
---
 arch/x86/kvm/lapic.c | 8 ++++----
 arch/x86/kvm/x86.c   | 6 +-----
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e82a18c..87ecb56 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1578,7 +1578,7 @@ static void start_sw_tscdeadline(struct kvm_lapic *apic)
            likely(ns > apic->lapic_timer.timer_advance_ns)) {
                expire = ktime_add_ns(now, ns);
                expire = ktime_sub_ns(expire, ktimer->timer_advance_ns);
-               hrtimer_start(&ktimer->timer, expire, HRTIMER_MODE_ABS_PINNED);
+               hrtimer_start(&ktimer->timer, expire, HRTIMER_MODE_ABS);
        } else
                apic_timer_expired(apic);
 
@@ -1680,7 +1680,7 @@ static void start_sw_period(struct kvm_lapic *apic)
 
        hrtimer_start(&apic->lapic_timer.timer,
                apic->lapic_timer.target_expiration,
-               HRTIMER_MODE_ABS_PINNED);
+               HRTIMER_MODE_ABS);
 }
 
 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu)
@@ -2317,7 +2317,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu, int 
timer_advance_ns)
        apic->vcpu = vcpu;
 
        hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
-                    HRTIMER_MODE_ABS_PINNED);
+                    HRTIMER_MODE_ABS);
        apic->lapic_timer.timer.function = apic_timer_fn;
        if (timer_advance_ns == -1) {
                apic->lapic_timer.timer_advance_ns = 1000;
@@ -2506,7 +2506,7 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
 
        timer = &vcpu->arch.apic->lapic_timer.timer;
        if (hrtimer_cancel(timer))
-               hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED);
+               hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
 }
 
 /*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0a05a4e..9450a16 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1437,12 +1437,8 @@ static void update_pvclock_gtod(struct timekeeper *tk)
 
 void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
 {
-       /*
-        * Note: KVM_REQ_PENDING_TIMER is implicitly checked in
-        * vcpu_enter_guest.  This function is only called from
-        * the physical CPU that is running vcpu.
-        */
        kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
+       kvm_vcpu_kick(vcpu);
 }
 
 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
-- 
2.7.4