Messages in this thread Patch in this message | | | Date | Mon, 13 Dec 2010 22:45:58 -0500 | From | Rik van Riel <> | Subject | [RFC -v2 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> --- - move vcpu->task manipulation as suggested by Chris Wright
include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 2 ++ 2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a055742..180085b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -81,6 +81,7 @@ struct kvm_vcpu { #endif int vcpu_id; struct mutex mutex; + struct task_struct *task; int cpu; atomic_t guest_mode; struct kvm_run *run; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 5225052..c95bad1 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2248,6 +2248,7 @@ static void kvm_sched_in(struct preempt_notifier *pn, int cpu) { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + vcpu->task = NULL; kvm_arch_vcpu_load(vcpu, cpu); } @@ -2256,6 +2257,7 @@ static void kvm_sched_out(struct preempt_notifier *pn, { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + vcpu->task = current; kvm_arch_vcpu_put(vcpu); }
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