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Re: [Xen-devel] Solaris and PVRDTSCP

To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Solaris and PVRDTSCP
From: Keir Fraser <keir.xen@xxxxxxxxx>
Date: Fri, 01 Jul 2011 18:18:55 +0100
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
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Thread-topic: [Xen-devel] Solaris and PVRDTSCP
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On 01/07/2011 18:02, "Paul Durrant" <Paul.Durrant@xxxxxxxxxx> wrote:

> Hi,
>   I've been trying to figure out why my copy of s10u9 did not run PV drivers
> when I installed it on Xen 4.1 when it was perfectly happy on Xen 3.4...
>   It turns out that the kernel is making a check that the maximal Xen CPUID
> leaf is no greater than base + 2. This was true on Xen 3.4 but when the
> PVRDTSCP patch was added it ceased to be true with the addition of the
> cpuid_time_leaf code.
>   Clearly future versions of the Solaris kernel should revise this check but
> to allow this kernel to enable PV drivers I was wondering what sort of
> workaround could be done. My current thoughts are along the lines of disabling
> the extra CPUID leaf if tsc_mode is < TSC_MODE_PVRDTSCP. An alternative might
> be to introduce another tsc_mode that specifically causes the leaf to be
> obscured. Thoughts?

We might add other leaves in future. Best might be a domctl to restrict max
leaf per domain, and do all the relevant plumbing of that through
toolstacks. Fun.

 -- Keir

>   Paul
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