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Re: [Qemu-devel] [PATCH 1/2] Revert "target-i386: Disable HLE and RTM on

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH 1/2] Revert "target-i386: Disable HLE and RTM on Haswell & Broadwell"
Date: Mon, 16 Mar 2015 10:18:24 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

On Fri, Mar 13, 2015 at 04:09:56PM -0300, Eduardo Habkost wrote:
> This reverts commit 13704e4c455770d500d6b87b117e32f0d01252c9.
> 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. The plan is to introduce "Haswell-noTSX" and
> "Broadwell-noTSX" CPU models later, for people who have CPUs that don't
> have TSX feature available.
> Signed-off-by: Eduardo Habkost <address@hidden>

Yep, in this situation we need to support both "models" of CPU, so changing
based on machine type is inappropriate in this scenario.

Reviewed-by: Daniel P. Berrange <address@hidden>

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