KVM: X86: Implement ring-based dirty memory tracking

[linux-2.6-microblaze.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b4ac726..6c704a5 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8754,6 +8754,15 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
        bool req_immediate_exit = false;
 
+       /* Forbid vmenter if vcpu dirty ring is soft-full */
+       if (unlikely(vcpu->kvm->dirty_ring_size &&
+                    kvm_dirty_ring_soft_full(&vcpu->dirty_ring))) {
+               vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL;
+               trace_kvm_dirty_ring_exit(vcpu);
+               r = 0;
+               goto out;
+       }
+
        if (kvm_request_pending(vcpu)) {
                if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
                        if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) {