RE: [Xen-devel] Solaris and PVRDTSCP

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

I was afraid you might say that :-/

  Ta,

    Paul

> -----Original Message-----
> From: Keir Fraser [mailto:keir.xen@xxxxxxxxx]
> Sent: 01 July 2011 18:19
> To: Paul Durrant; xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Dan Magenheimer
> Subject: Re: [Xen-devel] Solaris and PVRDTSCP
> 
> 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
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 


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