Re: [libvirt] [PATCH 3/3] qemu: hyperv: Add support for reference time couter enlightenment
On 02/07/14 12:03, Paolo Bonzini wrote:
Il 05/02/2014 12:02, Peter Krempa ha scritto:
> Add a new <timer> for the HyperV reference time counter enlightenment
> for Windows guests.
>
> This feature provides a paravirtual approach to track timer events for
> the quest (similar to kvmclock).
RTC can be confusing because the same acronym expands to both "real-time
clock" and "reference time counter".
I was confused too, when I saw it the first time.
By the way, the same <timer> will drive two things: the reference time
counter, and the reference TSC page. In current kernels, the reference
TSC page just tells the guest "use the reference time counter", but this
can be changed in the future without breaking the guest ABI.
That's right, the feature is actually backwards compatible to a great
extent and even tolerates the iTSC vanishing at migration. This makes
our lives really easier.
So, what about naming it hv_clock or hyperv_clock or hyperv_ref?
hyperv_clock then. DanPB was concerned that hv could mean "hypervisor"
to some people.
Paolo
Thanks for the feedback.
Peter
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