linux-kernel - Re: [PATCH 1/1] arch/x86/microcode/intel: Remove unnecessary cache writeback and invalidation

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Message-ID: <0aa05063-c9ed-465d-a7d2-e5fa0bc6379a@intel.com>
Date: Mon, 1 Jul 2024 15:56:20 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Chang S. Bae" <chang.seok.bae@...el.com>, linux-kernel@...r.kernel.org
Cc: x86@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, tony.luck@...el.com, ashok.raj@...el.com,
 Yan Hua Wu <yanhua1.wu@...el.com>, William Xie <william.xie@...el.com>
Subject: Re: [PATCH 1/1] arch/x86/microcode/intel: Remove unnecessary cache
 writeback and invalidation

On 7/1/24 14:20, Chang S. Bae wrote:
...> Remove native_wbinvd() and update the erratum name to align with the
> latest errata documentation.

I'm all for simplifying this code and also for removing any WBINVDs that
we possibly can.  But it also makes me a wee bit nervous that this could
have been hiding any _new_ issues (like the Broadwell one) had they
crept in.

I'm tentatively in favor of this, but it's definitely the kind of thing
we want to apply early and get maximum testing on.

I'd also appreciate an ack from Ashok on this one.