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From: Zhang, Yanmin on 10 Jun 2010 01:20
On Thu, 2010-06-10 at 06:06 +0300, Avi Kivity wrote:
> On 06/10/2010 05:21 AM, Zhang, Yanmin wrote:
> >
> >> I see. So put it in a union. Or perhaps not even in a union - what if
> >> a kvm guest is also acting as a kvm host?
> >>
> > My patch has consideration on it. I compiled kernel with host and guest support
> > at the same time. The accessing to perf_event->shadow is really under specific
> > scenarios, or they are just in specific functions. These functions are called
> > just bu host kernel , or just by guest kernel.
> >
>
> But a kernel can be both guest and host at the same time. Currently
> this only works on AMD, but there was some work to bring it to Intel as
> well.
Oh, this is a fancy VT feature. My patch doesn't support this mode.

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From: Peter Zijlstra on 10 Jun 2010 06:00
On Thu, 2010-06-10 at 10:21 +0800, Zhang, Yanmin wrote:
> . The ABI mostly includes the definition of struct perf_event_attr,
> guest_perf_counter,
> and hypercalls.

Note that perf_event_attr isn't guaranteed to be stable between kernels,
it can grow.
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From: Zhang, Yanmin on 10 Jun 2010 22:10
On Thu, 2010-06-10 at 11:50 +0200, Peter Zijlstra wrote:
> On Thu, 2010-06-10 at 10:21 +0800, Zhang, Yanmin wrote:
> > . The ABI mostly includes the definition of struct perf_event_attr,
> > guest_perf_counter,
> > and hypercalls.
>
> Note that perf_event_attr isn't guaranteed to be stable between kernels,
> it can grow.
Thanks. I need create a small new attr structure to save some key data members.

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