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Re: LBR and Sapphire Rapids
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 9 Jan 2023 12:13:42 +0100
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 09 Jan 2023 11:13:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.01.2023 19:21, Andrew Cooper wrote:
> On SPR, MSR_DBG_CTRL.LBR is a write-discard bit. There really are no
> model specific LBRs, so we should emulate it as write discard too. More
> generally, I think we should apply that to any system were we don't know
> the model-specific indices.
>
> I think this will be sufficient to avoid crashing guests on SPR. Any
> software actually expecting to use model specific LBR would need a model
> table anyway just like Xen has, and will not get it updated with SPR's
> model number, so for the (more) common case of not having migrated,
> things should turn off cleanly.
Sounds reasonable as a plan.
Jan
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