linux-kernel - Re: [PATCH v2 07/15] x86/lib/copy_user_64.S: Convert to ALTERNATIVE

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Message-ID: <20150305082304.GA3915@pd.tnic>
Date:	Thu, 5 Mar 2015 09:23:04 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86 ML <x86@...nel.org>, Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 07/15] x86/lib/copy_user_64.S: Convert to ALTERNATIVE_2

On Thu, Mar 05, 2015 at 01:34:17AM +0100, Ingo Molnar wrote:
> So I'd not patch in the large _orig variant, it's legacy mostly - but
> the two fast variants?

Yes, so the optimal thing would be to have the kernel generate the CALL
<REP_GOOD> variant when building. Those are going to be the default
opcodes in vmlinux coming out of build.

Then, when booted on ERMS machines, we'll patch in CALL <ERMS version>
and as a last resort fallback, the CALL to the legacy variant on really
old boxes.

/me puts it on the TODO.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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