Messages in this thread Patch in this message | | | Date | Thu, 2 Dec 2010 14:43:24 -0500 | From | Rik van Riel <> | Subject | [RFC PATCH 1/3] kvm: keep track of which task is running a KVM vcpu |
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Keep track of which task is running a KVM vcpu. This helps us figure out later what task to wake up if we want to boost a vcpu that got preempted.
Unfortunately there are no guarantees that the same task always keeps the same vcpu, so we can only track the task across a single "run" of the vcpu.
Signed-off-by: Rik van Riel <riel@redhat.com>
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 5fbdb55..cb73a73 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -79,6 +79,7 @@ struct kvm_vcpu { #endif int vcpu_id; struct mutex mutex; + struct task_struct *task; int cpu; struct kvm_run *run; unsigned long requests; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 050577a..2bffa47 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -741,6 +741,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) int cpu; mutex_lock(&vcpu->mutex); + vcpu->task = current; cpu = get_cpu(); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); @@ -749,6 +750,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) void vcpu_put(struct kvm_vcpu *vcpu) { + vcpu->task = NULL; preempt_disable(); kvm_arch_vcpu_put(vcpu); preempt_notifier_unregister(&vcpu->preempt_notifier);
-- All rights reversed.
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