From: "H. Peter Anvin" <hpa@zytor.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@amd64.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Glauber de Oliveira Costa <gcosta@redhat.com>
Subject: [PATCH 0/5] RFC: x86: Early exception table support
Date: Wed, 18 Apr 2012 17:16:45 -0700 [thread overview]
Message-ID: <1334794610-5546-1-git-send-email-hpa@zytor.com> (raw)
If we get an exception during early boot, walk the exception table to
see if we should intercept it. The main use case for this is to allow
rdmsr_safe()/wrmsr_safe() during CPU initialization.
Since the exception table is currently sorted at runtime, and fairly
late in startup, this code walks the exception table linearly. We
obviously don't need to worry about modules, however: none have been
loaded at this point.
In the future it would be better to have the table sorted at compile
time, or even better, turned into a perfect hash. At that point this
code should be changed out from doing a linear search.
This patchset also makes the early exception handling a little more
similar between x86-64 and i386, but a lot of unification could (and
should) still be done: in particular, setup done in C as in x86-64,
and verbose error dump as in i386.
next reply other threads:[~2012-04-19 0:17 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 0:16 H. Peter Anvin [this message]
2012-04-19 0:16 ` [PATCH 1/5] x86, nop: Make the ASM_NOP* macros work from assembly H. Peter Anvin
2012-04-19 9:29 ` Borislav Petkov
2012-04-20 0:24 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 2/5] x86: Add symbolic constant for exceptions with error code H. Peter Anvin
2012-04-19 9:30 ` Borislav Petkov
2012-04-20 0:25 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 3/5] x86, paravirt: Replace GET_CR2_INTO_RCX with GET_CR2_INTO_RAX H. Peter Anvin
2012-04-20 0:26 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 4/5] x86-64: Handle exception table entries during early boot H. Peter Anvin
2012-04-19 13:02 ` Borislav Petkov
2012-04-19 16:59 ` H. Peter Anvin
2012-04-19 17:16 ` Borislav Petkov
2012-04-20 0:29 ` [tip:x86/extable] x86, doc: Revert "x86: Document rdmsr_safe restrictions" tip-bot for H. Peter Anvin
2012-04-20 0:28 ` [tip:x86/extable] x86-64: Handle exception table entries during early boot tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 5/5] x86-32: " H. Peter Anvin
2012-04-20 0:28 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 9:22 ` [PATCH 0/5] RFC: x86: Early exception table support Borislav Petkov
2012-04-19 9:24 ` [PATCH 1/3] x86, extable: Cleanup fixup_exception Borislav Petkov
2012-04-19 9:25 ` [PATCH 2/3] x86, extable: Carve out the main extable searching routine Borislav Petkov
2012-04-19 9:26 ` [PATCH 3/3] x86, extable: Handle early exceptions Borislav Petkov
2012-04-19 17:02 ` H. Peter Anvin
2012-04-19 17:27 ` Linus Torvalds
2012-04-19 17:38 ` Borislav Petkov
2012-04-19 17:59 ` H. Peter Anvin
2012-04-19 18:25 ` Linus Torvalds
2012-04-19 18:55 ` H. Peter Anvin
2012-04-19 20:17 ` David Daney
2012-04-19 20:20 ` H. Peter Anvin
2012-04-19 20:26 ` H. Peter Anvin
2012-04-19 20:40 ` David Daney
2012-04-19 21:47 ` Linus Torvalds
2012-04-19 22:16 ` H. Peter Anvin
2012-04-19 22:47 ` Tony Luck
2012-04-19 22:58 ` Linus Torvalds
2012-04-19 23:10 ` H. Peter Anvin
2012-04-19 23:26 ` Tony Luck
2012-04-19 23:35 ` H. Peter Anvin
2012-04-20 8:26 ` Andreas Schwab
2012-04-19 18:11 ` Linus Torvalds
2012-04-20 8:46 ` Borislav Petkov
2012-04-19 17:54 ` H. Peter Anvin
2012-04-20 0:27 ` [tip:x86/extable] x86, extable: Add early_fixup_exception() tip-bot for H. Peter Anvin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1334794610-5546-1-git-send-email-hpa@zytor.com \
--to=hpa@zytor.com \
--cc=bp@amd64.org \
--cc=gcosta@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®