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Re: [Qemu-devel] [PATCH 0/2] target-i386: Haswell-noTSX and Broadwell-no

From: Eduardo Habkost
Subject: Re: [Qemu-devel] [PATCH 0/2] target-i386: Haswell-noTSX and Broadwell-noTSX CPU models
Date: Fri, 13 Mar 2015 16:45:18 -0300
User-agent: Mutt/1.5.23 (2014-03-12)

On Fri, Mar 13, 2015 at 08:25:19PM +0100, Andreas Färber wrote:
> Am 13.03.2015 um 20:09 schrieb Eduardo Habkost:
> > With the Intel microcode update that removed HLE and RTM, there will be
> > different kinds of Haswell and Broadwell CPUs out there: some that still
> > have the HLE and RTM features, and some that don't have the HLE and RTM
> > features. On both cases people may be willing to use the pc-*-2.3
> > machine-types.
> > 
> > So instead of making the CPU model results confusing by making it depend on 
> > the
> > machine-type, keep HLE and RTM on the existing Haswell and Broadwell CPU
> > models, and introduce "Haswell-noTSX" and "Broadwell-noTSX" CPU models 
> > later,
> > for people who have CPUs that don't have TSX feature available.
> > 
> > Eduardo Habkost (2):
> >   Revert "target-i386: Disable HLE and RTM on Haswell & Broadwell"
> >   target-i386: Haswell-noTSX and Broadwell-noTSX
> No objections from a generic CPU point of view.
> Only thing that comes to mind is whether it might make sense to
> hierarchically make Broadwell the parent type of Broadwell-noTSX, to
> avoid duplication. But then again we already have a lot of it. ;)

The builtin_x86_defs[] table has no way to represent inheritance,
currently. Maybe one day when we move everything inside class_init
functions. :)


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