KVM: ia64: Remove lock held by halted vcpu

Remove the lock protection for kvm halt logic, otherwise,
once other vcpus want to acquire the lock, and they have to
wait all vcpus are waken up from halt.

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 43e45f6afcda03d5fb2ff96b9c2dbbccd26dcd36..70eb829767f4601f5ea36fc91a087d80505fd0e3 100644 (file)
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -439,7 +439,6 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu)
                expires = div64_u64(itc_diff, cyc_per_usec);
                kt = ktime_set(0, 1000 * expires);
 
-               down_read(&vcpu->kvm->slots_lock);
                vcpu->arch.ht_active = 1;
                hrtimer_start(p_ht, kt, HRTIMER_MODE_ABS);
 
@@ -452,7 +451,6 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu)
                        if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
                                vcpu->arch.mp_state =
                                        KVM_MP_STATE_RUNNABLE;
-               up_read(&vcpu->kvm->slots_lock);
 
                if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
                        return -EINTR;