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From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Marcelo Tosatti" <mtosatti@redhat.com>
Subject: [PATCH v4 1/5] KVM: LAPIC: Make lapic timer unpinned
Date: Mon, 17 Jun 2019 19:24:43 +0800
Message-ID: <1560770687-23227-2-git-send-email-wanpengli@tencent.com> (raw)
In-Reply-To: <1560770687-23227-1-git-send-email-wanpengli@tencent.com>

From: Wanpeng Li <wanpengli@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 <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@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


  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 11:24 [PATCH v4 0/5] KVM: LAPIC: Implement Exitless Timer Wanpeng Li
2019-06-17 11:24 ` Wanpeng Li [this message]
2019-06-17 11:48   ` [PATCH v4 1/5] KVM: LAPIC: Make lapic timer unpinned Peter Xu
2019-06-18  0:38     ` Wanpeng Li
2019-06-17 11:24 ` [PATCH v4 2/5] KVM: LAPIC: inject lapic timer interrupt by posted interrupt Wanpeng Li
2019-06-18 13:35   ` Marcelo Tosatti
2019-06-19  0:36     ` Wanpeng Li
2019-06-19 21:03       ` Marcelo Tosatti
2019-06-20  0:52         ` Wanpeng Li
2019-06-21  1:42         ` Wanpeng Li
2019-06-21 21:42           ` Marcelo Tosatti
2019-06-24  8:53             ` Wanpeng Li
2019-06-25 19:00               ` Marcelo Tosatti
2019-06-26 11:02                 ` Wanpeng Li
2019-06-26 16:44                   ` Marcelo Tosatti
2019-06-28  8:26                     ` Wanpeng Li
2019-06-25 17:02             ` Paolo Bonzini
2019-06-17 11:24 ` [PATCH v4 3/5] KVM: LAPIC: Ignore timer migration when lapic timer is injected by pi Wanpeng Li
2019-06-17 11:24 ` [PATCH v4 4/5] KVM: LAPIC: Don't posted inject already-expired timer Wanpeng Li
2019-06-17 11:24 ` [PATCH v4 5/5] KVM: LAPIC: add advance timer support to pi_inject_timer Wanpeng Li
2019-06-17 21:32   ` Radim Krčmář
2019-06-18  0:44     ` Wanpeng Li
2019-06-18  0:57       ` Wanpeng Li

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