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/kvm.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/kvm/kvm.h') diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index e92c84b04c1f..0667183ecbed 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -301,6 +302,7 @@ void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_vcpu { struct kvm *kvm; + struct preempt_notifier preempt_notifier; int vcpu_id; struct mutex mutex; int cpu; @@ -429,7 +431,7 @@ struct kvm_arch_ops { struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id); void (*vcpu_free)(struct kvm_vcpu *vcpu); - void (*vcpu_load)(struct kvm_vcpu *vcpu); + void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu); void (*vcpu_put)(struct kvm_vcpu *vcpu); void (*vcpu_decache)(struct kvm_vcpu *vcpu); -- cgit v1.2.3