Re: [Qemu-ppc] [Qemu-devel] [PATCH 3/3] target/ppc: filter out non-zero PCR values when using TCG

[David Gibson]

On Thu, Jun 14, 2018 at 05:38:16PM -1000, Richard Henderson wrote:
> On 06/14/2018 03:45 PM, David Gibson wrote:
> >>> To wit, the instructions are recognized and transactions always fail.  
> >>> Which is
> >>> not a bad way to test the required fallback paths that rarely fail on 
> >>> hardware.
> >>>  ;-)
> >>
> >> If TM instructions don't cause an exception, I guess its reasonable to say
> >> they're supported :)
> > 
> > That argument has come up before, and I disagree.  I don't think it's
> > reasonable to advertise TM support as available if the instructions
> > always fail.
> 
> Is it possible to turn it on from the command-line?

Not at present.. attempting to is what gives the error message
discussed above.

> Like one can with -cpu foo,+opt on x86 or -cpu foo,opt=on on s390?
> 
> 
> r~
> 

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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