From 15ad71460d75fd7ca41bb248a2310f3f39b302ba Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 11 Jul 2007 18:17:21 +0300 Subject: KVM: Use the scheduler preemption notifiers to make kvm preemptible Current kvm disables preemption while the new virtualization registers are in use. This of course is not very good for latency sensitive workloads (one use of virtualization is to offload user interface and other latency insensitive stuff to a container, so that it is easier to analyze the remaining workload). This patch re-enables preemption for kvm; preemption is now only disabled when switching the registers in and out, and during the switch to guest mode and back. Contains fixes from Shaohua Li . Signed-off-by: Avi Kivity --- drivers/kvm/svm.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'drivers/kvm/svm.c') diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 0feec8558599..3997bbd78fb7 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -625,12 +625,11 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu) kfree(svm); } -static void svm_vcpu_load(struct kvm_vcpu *vcpu) +static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct vcpu_svm *svm = to_svm(vcpu); - int cpu, i; + int i; - cpu = get_cpu(); if (unlikely(cpu != vcpu->cpu)) { u64 tsc_this, delta; @@ -657,7 +656,6 @@ static void svm_vcpu_put(struct kvm_vcpu *vcpu) wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); rdtscll(vcpu->host_tsc); - put_cpu(); } static void svm_vcpu_decache(struct kvm_vcpu *vcpu) -- cgit v1.2.2