From: Sean Christopherson <sean.j.christopher...@intel.com>
commit ee66e453db13d4837a0dcf9d43efa7a88603161b upstream.
...now that VMX's preemption timer, i.e. the hv_timer, also adjusts its
programmed time based on lapic_timer_advance_ns. Without the delay, a
guest can see a timer interrupt arrive before the requested time when
KVM is using the hv_timer to emulate the guest's interrupt.
Fixes: c5ce8235cffa0 ("KVM: VMX: Optimize tscdeadline timer latency")
Cc: <sta...@vger.kernel.org>
Cc: Wanpeng Li <wanpen...@tencent.com>
Reviewed-by: Liran Alon <liran.a...@oracle.com>
Signed-off-by: Sean Christopherson <sean.j.christopher...@intel.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kvm/lapic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1454,7 +1454,7 @@ static void apic_timer_expired(struct kv
if (swait_active(q))
swake_up_one(q);
- if (apic_lvtt_tscdeadline(apic))
+ if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
ktimer->expired_tscdeadline = ktimer->tscdeadline;
}
