Re: [PATCH v4 2/5] arm64: errata: Assume that unknown CPUs _are_ vulnerable to Spectre BHB

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On Wed, Jan 29, 2025 at 11:14:20AM -0800, Doug Anderson wrote:
> On Wed, Jan 29, 2025 at 8:43 AM James Morse <james.morse@xxxxxxx> wrote:
> > Arm have recently updated that table of CPUs
> > with extra entries (thanks for picking those up!) - but now that patch can't be easily
> > applied to older kernels.
> > I suspect making the reporting assuming-vulnerable may make other CPUs come out of the
> > wood work too...
> >
> > Could we avoid changing this unless we really need to?
> 
> Will / Catalin: Do either of you have an opinion here?

Is this about whether to report "vulnerable" for unknown CPUs? I think
Will suggested this:

https://lore.kernel.org/all/20241219175128.GA25477@willie-the-truck/

That said, some patch splitting will help to make review easier. Should
such change be back-portable as well? I think so, it's not only for CPUs
we'll see in the future.

-- 
Catalin




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