KVM: nSVM: remove a warning about vmcb01 VM exit reason

While in most cases, when returning to use the VMCB01,
the exit reason stored in it will be SVM_EXIT_VMRUN,
on first VM exit after a nested migration this field
can contain anything since the VM entry did happen
before the migration.

Remove this warning to avoid the false positive.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210504143936.1644378-3-mlevitsk@redhat.com>
Fixes: 9a7de6ec ("KVM: nSVM: If VMRUN is single-stepped, queue the #DB intercept in nested_svm_vmexit()")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm/nested.c

@@ -764,7 +764,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
 	nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr);
 
 	svm_switch_vmcb(svm, &svm->vmcb01);
-	WARN_ON_ONCE(svm->vmcb->control.exit_code != SVM_EXIT_VMRUN);
 
 	/*
 	 * On vmexit the  GIF is set to false and