From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Brian Gerst <brgerst@gmail.com>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] x86/alternatives: Add an auxilary section
Date: Thu, 21 Jan 2016 11:00:03 -0800 [thread overview]
Message-ID: <56A12AB3.90607@zytor.com> (raw)
In-Reply-To: <1453401286-26966-5-git-send-email-bp@alien8.de>
On 01/21/16 10:34, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> Add .altinstr_aux for additional instructions which will be used before
> and/or during patching. All stuff which needs more sophisticated
> patching should go there. See next patch.
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> ---
> arch/x86/kernel/vmlinux.lds.S | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index 74e4bf11f562..1335ff4854ae 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -244,6 +244,15 @@ SECTIONS
> */
> .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
> *(.altinstr_replacement)
> + /*
> + * Section for code used exclusively before alternatives are
> + * run. All references to such code must be patched out by
> + * alternatives, normally by using a patch with
> + * X86_FEATURE_ALWAYS.
> + *
> + * See static_cpu_has() for an example.
> + */
> + *(.altinstr_aux)
> }
NAK on this being part of .altinstr_replacement (if anything it ought to
simply be part of .text.init). Otherwise fine.
-hpa
next prev parent reply other threads:[~2016-01-21 19:00 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 18:34 [RFC PATCH 0/5] x86/cpufeature: Cleanups and improvements Borislav Petkov
2016-01-21 18:34 ` [PATCH 1/5] x86/cpufeature: Carve out X86_FEATURE_* Borislav Petkov
2016-01-21 18:57 ` H. Peter Anvin
2016-01-21 19:03 ` Borislav Petkov
2016-01-22 11:19 ` Borislav Petkov
2016-02-03 14:36 ` David Howells
2016-01-21 18:34 ` [PATCH 2/5] x86/cpufeature: Remove static_cpu_has() Borislav Petkov
2016-01-21 19:04 ` Andy Lutomirski
2016-01-21 19:39 ` Borislav Petkov
2016-01-21 19:41 ` H. Peter Anvin
2016-01-21 19:51 ` Borislav Petkov
2016-01-21 19:05 ` H. Peter Anvin
2016-01-21 18:34 ` [PATCH 3/5] x86/cpufeature: Get rid of the non-asm goto variant Borislav Petkov
2016-01-21 18:59 ` H. Peter Anvin
2016-01-21 18:34 ` [PATCH 4/5] x86/alternatives: Add an auxilary section Borislav Petkov
2016-01-21 19:00 ` H. Peter Anvin [this message]
2016-01-21 19:07 ` Borislav Petkov
2016-01-21 19:10 ` H. Peter Anvin
2016-01-21 18:34 ` [PATCH 5/5] x86/alternatives: Discard dynamic check after init Borislav Petkov
2016-01-21 19:03 ` H. Peter Anvin
2016-01-21 21:53 ` [RFC PATCH 0/5] x86/cpufeature: Cleanups and improvements Brian Gerst
2016-01-21 22:20 ` Borislav Petkov
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