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authorAvi Kivity <avi@qumranet.com>2007-07-11 18:17:21 +0300
committerAvi Kivity <avi@qumranet.com>2007-10-13 10:18:20 +0200
commit15ad71460d75fd7ca41bb248a2310f3f39b302ba (patch)
tree1ea549e5c5629561c121a54def146fb6b706c2d4 /drivers/kvm/svm.c
parent519ef35341b4f360f072ea74e398b70a5a2fc270 (diff)
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 <shaohua.li@intel.com>. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/svm.c')
-rw-r--r--drivers/kvm/svm.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 0feec855859..3997bbd78fb 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)