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>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c8dee22b1945..4721b11b922a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -122,6 +122,7 @@ struct kvm_vcpu {
         int fpu_active;
         int guest_fpu_loaded, guest_xcr0_loaded;
         wait_queue_head_t wq;
+        struct pid *pid;
         int sigset_active;
         sigset_t sigset;
         struct kvm_vcpu_stat stat;