From ab9c81f473b3feff08f1e51428fbaf6a93d4896a Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Mon, 13 Jun 2016 14:20:00 -0700 Subject: kvm: lapic: separate start_sw_tscdeadline from start_apic_timer The function to start the tsc deadline timer virtualization will be used also by the pre_block hook when we use the preemption timer; change it to a separate function. No logic changes. upstream-status: backport Change-Id: Ie2fc19108c3252f8a299b17aba16c14aa8d31ae8 Signed-off-by: Yunhong Jiang Signed-off-by: Paolo Bonzini Signed-off-by: Yunhong Jiang --- kernel/arch/x86/kvm/lapic.c | 57 ++++++++++++++++++++++++--------------------- 1 file changed, 31 insertions(+), 26 deletions(-) (limited to 'kernel/arch/x86/kvm') diff --git a/kernel/arch/x86/kvm/lapic.c b/kernel/arch/x86/kvm/lapic.c index 20d9e9fb3..1e1e7eb8e 100644 --- a/kernel/arch/x86/kvm/lapic.c +++ b/kernel/arch/x86/kvm/lapic.c @@ -1258,6 +1258,36 @@ void wait_lapic_expire(struct kvm_vcpu *vcpu) __delay(tsc_deadline - guest_tsc); } +static void start_sw_tscdeadline(struct kvm_lapic *apic) +{ + u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline; + u64 ns = 0; + ktime_t expire; + struct kvm_vcpu *vcpu = apic->vcpu; + unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz; + unsigned long flags; + ktime_t now; + + if (unlikely(!tscdeadline || !this_tsc_khz)) + return; + + local_irq_save(flags); + + now = apic->lapic_timer.timer.base->get_time(); + guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); + if (likely(tscdeadline > guest_tsc)) { + ns = (tscdeadline - guest_tsc) * 1000000ULL; + do_div(ns, this_tsc_khz); + expire = ktime_add_ns(now, ns); + expire = ktime_sub_ns(expire, lapic_timer_advance_ns); + hrtimer_start(&apic->lapic_timer.timer, + expire, HRTIMER_MODE_ABS_PINNED); + } else + apic_timer_expired(apic); + + local_irq_restore(flags); +} + static void start_apic_timer(struct kvm_lapic *apic) { ktime_t now; @@ -1304,32 +1334,7 @@ static void start_apic_timer(struct kvm_lapic *apic) ktime_to_ns(ktime_add_ns(now, apic->lapic_timer.period))); } else if (apic_lvtt_tscdeadline(apic)) { - /* lapic timer in tsc deadline mode */ - u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline; - u64 ns = 0; - ktime_t expire; - struct kvm_vcpu *vcpu = apic->vcpu; - unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz; - unsigned long flags; - - if (unlikely(!tscdeadline || !this_tsc_khz)) - return; - - local_irq_save(flags); - - now = apic->lapic_timer.timer.base->get_time(); - guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); - if (likely(tscdeadline > guest_tsc)) { - ns = (tscdeadline - guest_tsc) * 1000000ULL; - do_div(ns, this_tsc_khz); - expire = ktime_add_ns(now, ns); - expire = ktime_sub_ns(expire, lapic_timer_advance_ns); - hrtimer_start(&apic->lapic_timer.timer, - expire, HRTIMER_MODE_ABS); - } else - apic_timer_expired(apic); - - local_irq_restore(flags); + start_sw_tscdeadline(apic); } } -- cgit 1.2.3-korg