On Wed, Aug 31, 2011 at 10:58 AM, Blue Swirl <blauwir...@gmail.com> wrote: > 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. >
>From what I understand, kvmclock should be good enoguh for this purpose. That is what I am using. Dhaval
