Messages in this thread | | | Date | Wed, 31 Jan 2018 14:04:49 +0000 | From | "Dr. David Alan Gilbert" <> | Subject | Re: [RFC,05/10] x86/speculation: Add basic IBRS support infrastructure |
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* Borislav Petkov (bp@suse.de) wrote: > On Wed, Jan 31, 2018 at 12:30:36PM +0000, Dr. David Alan Gilbert wrote: > > Indeed, it's only for this weird case where you suddenly need to change > > it. > > No, there's more: > > .name = "Broadwell-noTSX", > .name = "Haswell-noTSX",
Haswell came out and we made the CPU definition, and then got a microcode update that removed the feature.
So the common feature of noTSX and IBRS is that they're the only two cases where a CPU has released and then the flags have changed later.
Dave
> -- > Regards/Gruss, > Boris. > > SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) > -- -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
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