From: Pavel Machek <pavel@ucw.cz>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andi Kleen <ak@suse.de>, Avi Kivity <avi@qumranet.com>,
Glauber de Oliveira Costa <gcosta@redhat.com>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
glommer@gmail.com, tglx@linutronix.de, mingo@elte.hu,
ehabkost@redhat.com, jeremy@goop.org, anthony@codemonkey.ws,
virtualization@lists.linux-foundation.org, rusty@rustcorp.com.au,
chrisw@sous-sol.org, rostedt@goodmis.org, hpa@zytor.com,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: [PATCH 4/8] unify paravirt parts of system.h
Date: Sat, 15 Dec 2007 23:54:19 +0100
Message-ID: <20071215225419.GB2434@elf.ucw.cz> (raw)
In-Reply-To: <20071215132638.GA28231@basil.nowhere.org>
On Sat 2007-12-15 14:26:38, Andi Kleen wrote:
> > It probably is safe to remove... but we currently support '2.8.95
> > kernel loads/resumes 2.6.24 image'... which would break if 2.8 uses
> > cr8.
>
> No it won't. 2.8 would just restore some random useless value.
Restoring random value seems wrong. Putting random values into cpu
registers can break stuff, right?
Even if 2.6.24 image being restored did not set %cr8 itself, it may
depend on %cr8 to have "sane" value.
> If 2.8 wants to use CR8 it would have to re-initialize it
We are talking "2.8 restores 2.6 image" here.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply index
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-04 16:06 [PATCH 0/8] Integrate system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 1/8] remove volatile keyword from clflush Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 2/8] put together equal pieces of system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 3/8] unify load_segment macro Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 4/8] unify paravirt parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 5/8] remove unused macro Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 6/8] unify smp parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 7/8] move switch_to macro to system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 8/8] unify system.h Glauber de Oliveira Costa
2007-12-04 19:18 ` [PATCH 4/8] unify paravirt parts of system.h Avi Kivity
2007-12-04 19:34 ` Andi Kleen
2007-12-05 16:30 ` Pavel Machek
2007-12-15 13:17 ` Ingo Molnar
2007-12-17 0:27 ` Rafael J. Wysocki
2007-12-17 0:23 ` Pavel Machek
2007-12-17 0:58 ` Rafael J. Wysocki
2007-12-15 13:26 ` Andi Kleen
2007-12-15 22:54 ` Pavel Machek [this message]
2007-12-15 20:28 ` H. Peter Anvin
2007-12-04 19:41 ` Glauber de Oliveira Costa
2007-12-04 22:14 ` Denys Vlasenko
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=20071215225419.GB2434@elf.ucw.cz \
--to=pavel@ucw.cz \
--cc=ak@suse.de \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=anthony@codemonkey.ws \
--cc=avi@qumranet.com \
--cc=chrisw@sous-sol.org \
--cc=ehabkost@redhat.com \
--cc=gcosta@redhat.com \
--cc=glommer@gmail.com \
--cc=hpa@zytor.com \
--cc=jeremy@goop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=rjw@sisk.pl \
--cc=rostedt@goodmis.org \
--cc=rusty@rustcorp.com.au \
--cc=tglx@linutronix.de \
--cc=virtualization@lists.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
LKML Archive on lore.kernel.org
Archives are clonable:
git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
linux-kernel@vger.kernel.org
public-inbox-index lkml
Example config snippet for mirrors
Newsgroup available over NNTP:
nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git