linux-kernel - Re: [PATCH v2 00/11] Fix up SRSO stuff

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Message-ID: <20230814200916.GJZNqJ7H3MaO0ZTO5/@fat_crate.local>
Date:   Mon, 14 Aug 2023 22:09:16 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, David.Kaplan@....com,
        Andrew.Cooper3@...rix.com, gregkh@...uxfoundation.org,
        nik.borisov@...e.com
Subject: Re: [PATCH v2 00/11] Fix up SRSO stuff

On Mon, Aug 14, 2023 at 01:01:28PM -0700, Josh Poimboeuf wrote:
> How about:
> 
>   "both the RET in zen_untrain_ret() and the LEA in srso_untrain_ret()"
> 
> ?

Yeah, or the "instruction sequences starting at srso_safe_ret and
retbleed_return_thunk" (that's what it's called now) "must start at
a cacheline boundary."

Because the LEA was ADD but that changed so saying "the instruction
sequences" just works.

Thx.

-- 
Regards/Gruss,
    Boris.

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