On Wed, Aug 31, 2011 at 8:38 AM, Avi Kivity <a...@redhat.com> wrote: > On 08/26/2011 10:06 PM, Blue Swirl wrote: >> >> Let guests inject tracepoint data via fw_cfg device. >> >> > > At least on x86, fw_cfg is pretty slow, involving multiple exits. IMO, for > kvm, even one exit per tracepoint is too high. We need to use a shared > memory transport with a way to order guest/host events later on (by using a > clock).
This could be an easy way, if the guest always had access to an accurate clock, but that may not be the case.
