Re: [Xen-devel] [PATCH 1/2] x86/vtx: Corrections to BFD93 errata workaround

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Monday, October 28, 2019 11:02 PM
> 
> At the time of fixing c/s 20f1976b44, no obvious errata had been published,
> and BDF14 looked like the most obvious candidate.  Subsequently, BDF93
> has
> been published and it is obviously this.
> 
> The erratum states that LER_TO_LIP is the only affected MSR.  The
> provisional
> fix in Xen adjusted LER_FROM_LIP, but this is not correct.  The FROM MSRs
> are
> intended to have TSX metadata, and for steppings with TSX enabled, it will
> corrupt the value the guest sees, while for parts with TSX disabled, it is
> redundant with FIXUP_TSX.  Drop the LER_FROM_LIP adjustment.
> 
> Replace BDF14 references with BDF93, drop the redundant 'bdw_erratum_'
> prefix,
> and use an Intel vendor check, as other vendors implement VT-x.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
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