Hi again,
On Tue, Oct 16, 2018 at 02:25:42PM +0800, Wanpeng Li wrote:
> > - set_debugreg(0, 6);
> > + if (vcpu->arch.dr6)
> > + set_debugreg(0, 6);
>
> I tried this immediately after the offline discussion between Paolo
> and you several months ago, however, I can observe the issue was still
> present.
I finally came up with a test setup myself: L0 is ubuntu 18.04, L1 is
is debian testing, L2 ist just kvm with sebios and no OS. Without a
patch to the L1 kernel L0 sees about 100k DR_ACCESS exit during seabios
boot alone. Using
if (vcpu->arch.dr6 != DR6_INIT)
set_debugreg(DR6_INIT, 6);
the useless DR_ACCESS exits are gone. I'll post an updated patch in
a new thread.
regards Christian
