[PATCH v2 1/1] cpu_map: Add more -noTSX x86 CPU models

[Jiri Denemark]

On Fri, Mar 13, 2020 at 09:45:15 +0100, Christian Ehrhardt wrote:
> On Tue, Mar 10, 2020 at 11:48 AM Christian Ehrhardt <
> christian.ehrhardt at canonical.com> wrote:
> 
> > One of the mitigation methods for TAA[1] is to disable TSX
> > support on the host system.  Linux added a mechanism to disable
> > TSX globally through the kernel command line, and many Linux
> > distributions now default to tsx=off.  This makes existing CPU
> > models that have HLE and RTM enabled not usable anymore.
> >
> > Add new versions of all CPU models that have the HLE and RTM
> > features enabled, that can be used when TSX is disabled in the
> > host system.
> >
> > On systems disabling the features without those types defined
> > in cpu-maps users end up without modern CPU types in the list
> > of usable CPUs to use in the likes of virsh domcapabilities
> > or tools higher in the stack like virt-manager.
> >
> > This adds:
> > -Cascadelake-Server-noTSX
> > -Icelake-Client-noTSX
> > -Icelake-Server-noTSX
> > -Skylake-Server-noTSX-IBRS
> > -Skylake-Client-noTSX-IBRS
> >
> > Introduced in QEMU by commit v4.2.0-rc2-3-g9ab2237f19 (function)
> >                   and commit v4.2.0-rc2-4-g02fa60d101 (names)
> >
> 
> Ping - anything else that we need for this v2 right now to accept it?
> 
> I know in the long run Jiri would want to auto-select the non noTSX types.
> But as I outlined before I'd consider this a later change or would need
> some guidance where/how it is envisioned to do tat preference.

Sorry, I already started working on this additional patch as I'd like it
to be pushed right after yours. But I got distracted by other higher
priority things. I hope to finish it and send for a review soon.

Jirka