[PATCH] KVM: x86: Use do_div for tsc deadline calculation
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: 2011-09-30 11:50:48
Also in:
kvm, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Required on i386 hosts. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- arch/x86/kvm/lapic.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index f9385ec..92390dc 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c@@ -740,9 +740,10 @@ static void start_apic_timer(struct kvm_lapic *apic) now = apic->lapic_timer.timer.base->get_time(); guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu); - if (likely(tscdeadline > guest_tsc)) - ns = (tscdeadline - guest_tsc) - * 1000000L / this_tsc_khz; + if (likely(tscdeadline > guest_tsc)) { + ns = (tscdeadline - guest_tsc) * 1000000ULL; + do_div(ns, this_tsc_khz); + } hrtimer_start(&apic->lapic_timer.timer, ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
--
1.7.3.4