Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1313116
| From | "H. Peter Anvin" <hpa@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init |
| Date | 2016-01-20 12:00 +0100 |
| Message-ID | <qSYEz-5ea-13@gated-at.bofh.it> (permalink) |
| References | (6 earlier) <qSALU-5Mg-9@gated-at.bofh.it> <qSSfM-16M-41@gated-at.bofh.it> <qSSIO-1jE-65@gated-at.bofh.it> <qSSSu-1pe-35@gated-at.bofh.it> <qSYEz-5ea-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On January 20, 2016 2:50:18 AM PST, Borislav Petkov <bp@suse.de> wrote:
>On Tue, Jan 19, 2016 at 08:42:10PM -0800, H. Peter Anvin wrote:
>> Right. I wish we could tag reference call sites as clean, not
>sources
>> or targets. Sigh.
>
>I was thinking about something like this:
>
>From: Borislav Petkov <bp@suse.de>
>Date: Wed, 20 Jan 2016 11:45:36 +0100
>Subject: [PATCH] x86/alternatives: Add an auxilary section
>
>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 | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/arch/x86/kernel/vmlinux.lds.S
>b/arch/x86/kernel/vmlinux.lds.S
>index 74e4bf11f562..35868bf529b9 100644
>--- a/arch/x86/kernel/vmlinux.lds.S
>+++ b/arch/x86/kernel/vmlinux.lds.S
>@@ -244,6 +244,11 @@ SECTIONS
> */
> .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET)
>{
> *(.altinstr_replacement)
>+ /*
>+ * Auxiliary section for misc instruction patching tasks. See
>+ * static_cpu_has(), for an example.
>+ */
>+ *(.altinstr_aux)
> }
>
> /*
How about:
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.
--
Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-16 20:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-16 20:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-16 21:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-17 11:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-18 18:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-18 18:50 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-18 19:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-18 19:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-18 19:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-18 20:50 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 00:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-19 00:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 00:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 15:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 17:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 00:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-20 00:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Boris Petkov <bp@suse.de> - 2016-01-20 01:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 11:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 11:50 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-21 23:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-21 23:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-22 00:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-22 00:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-22 00:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-22 11:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-18 20:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 02:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-19 02:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-19 10:30 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-20 05:40 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:50 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 12:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 12:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 15:50 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 12:00 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 16:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 16:20 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Borislav Petkov <bp@suse.de> - 2016-01-20 17:10 +0100
Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 17:20 +0100
csiph-web