On 07/05/20 20:22, Peter Xu wrote: >> - svm->vmcb->save.dr6 = nested_vmcb->save.dr6; >> + svm->vcpu.arch.dr6 = nested_vmcb->save.dr6; > The rest looks very sane to me, but here I failed to figure out how arch.dr6 > finally applied to save.dr6. I saw it is applied in svm_vcpu_run() in the next > patch, but if that's the case then iiuc this commit may break bisection. Thanks, You're right, this needs a call to kvm_update_dr6 (which would go away on the next patch). Paolo