Re: [PATCH 4/4] kvm: x86: export TSC offset to user-space

[Stefan Hajnoczi]

On Wed, Aug 31, 2016 at 01:05:45PM -0400, Luiz Capitulino wrote:
> We need to retrieve a VM's TSC offset in order to use
> the host's TSC to merge host and guest traces. This is
> explained in detail in this thread:
> 
>   [Qemu-devel] [RFC] host and guest kernel trace merging
>   https://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg00887.html
> 
> Today, the only way to retrieve a VM's TSC offset is
> by using the kvm_write_tsc_offset tracepoint. This has
> a few problems. First, the tracepoint is only emitted
> when the VM boots, which requires a reboot to get it if
> the VM is already running. Second, tracepoints are not
> supposed to be ABIs in case they need to be consumed by
> user-space tools.
> 
> This commit exports a VM's TSC offset to user-space via
> debugfs. A new file called "tsc-offset" is created in
> the VM's debugfs directory. For example:
> 
>   /sys/kernel/debug/kvm/51696-10/tsc-offset
> 
> This file contains one TSC offset per line, for each
> vCPU. For example:
> 
>   vcpu0: 18446742405270834952
>   vcpu1: 18446742405270834952
>   vcpu2: 18446742405270834952
>   vcpu3: 18446742405270834952
> 
> There are some important observations about this
> solution:
> 
>  - While all vCPUs TSC offsets should be equal for the
>    cases we care about (ie. stable TSC and no write to
>    the TSC MSR), I chose to follow the spec and export
>    each vCPU's TSC offset (might also be helpful for
>    debugging)
> 
>  - The TSC offset is only useful after the VM has booted
> 
>  - We'll probably need to export the TSC multiplier too.
>    However, I've been using only the TSC offset for now.
>    So, let's get this merged first and do the TSC multiplier
>    as a second step

Can TSC offset changes occur at runtime?

One example is vcpu hotplug where the tracing tool would need to fetch
the new vcpu's TSC offset after tracing has already started.

Another example is if QEMU or the guest change the TSC offset while
running.  If the tracing tool doesn't notice this then trace events will have
incorrect timestamps.

Stefan

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