Thread (14 messages) 14 messages, 4 authors, 2025-03-14

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

From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2025-02-12 17:52:34
Also in: linux-arm-msm, lkml, stable

On Wed, Jan 29, 2025 at 11:14:20AM -0800, Doug Anderson wrote:
On Wed, Jan 29, 2025 at 8:43 AM James Morse [off-list ref] wrote:
quoted
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/ (local)

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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