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    Subject[RFC -v2 PATCH 1/3] kvm: keep track of which task is running a KVM vcpu
    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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