@@ -4089,6 +4089,13 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
continue;
if (kvm_vcpu_is_blocking(vcpu) && !vcpu_dy_runnable(vcpu))
continue;
+
+ /*
+ * Treat the target vCPU as being in-kernel if it has a
+ * pending interrupt, as the vCPU trying to yield may
+ * be spinning waiting on IPI delivery, i.e. the target
+ * vCPU is in-kernel for the purposes of directed yield.
+ */
if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode &&
!kvm_arch_dy_has_pending_interrupt(vcpu) &&
!kvm_arch_vcpu_preempted_in_kernel(vcpu))
Add a comment to explain why KVM treats vCPUs with pending interrupts as in-kernel when a vCPU wants to yield to a vCPU that was preempted while running in kernel mode. Signed-off-by: Sean Christopherson <seanjc@google.com> --- virt/kvm/kvm_main.c | 7 +++++++ 1 file changed, 7 insertions(+)