From: Ingo Molnar <mingo@elte.hu>
To: Gabriel C <nix.or.die@googlemail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
Arjan van de Ven <arjan@infradead.org>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>,
Avi Kivity <avi@qumranet.com>
Subject: Re: [git pull] x86 PAT changes
Date: Sat, 26 Apr 2008 17:41:23 +0200 [thread overview]
Message-ID: <20080426154123.GA7295@elte.hu> (raw)
In-Reply-To: <48134C45.806@googlemail.com>
* Gabriel C <nix.or.die@googlemail.com> wrote:
> Ingo Molnar wrote:
> > * Gabriel C <nix.or.die@googlemail.com> wrote:
> >
> >> Hi Ingo,
> >>
> >> When using an 64bit ( didn't got time to test 32bit now ) kernel[1]
> >> with PAT enabled , kvm-intel does not work anymore.
> >>
> >> When modprobing kvm-intel , kvm is saying VT extension is disable by
> >> BIOS which isn't true. When disabling PAT again ( no changes to BIOS )
> >> kvm-intel works again here.
> >>
> >> Is that an known problem ?
> >
> > no, that side-effect was not known. Cc:-ed more folks.
>
> It seems like the update triggers some compiler bug.
>
> Setting CC_OPTIMIZE_FOR_SIZE=n fixed that btw.
>
> I don't have the time right now but later on today I will compile
> gcc43_svn_branch and test again with CC_OPTIMIZE_FOR_SIZE=y and see
> what I get.
>
> Ingo sorry for the noise.
no problem and it's not noise even if it turns out to be a compiler
problem - we very much want to know about them when they affect the
kernel.
Ingo
next prev parent reply other threads:[~2008-04-26 15:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-24 22:56 [git pull] x86 PAT changes Ingo Molnar
2008-04-25 23:43 ` Linus Torvalds
2008-04-26 0:06 ` H. Peter Anvin
2008-04-26 1:12 ` Linus Torvalds
2008-04-26 8:56 ` Ingo Molnar
2008-04-26 16:54 ` Pallipadi, Venkatesh
2008-04-26 17:15 ` Linus Torvalds
2008-04-26 18:32 ` Venki Pallipadi
2008-04-26 19:07 ` [patch] x86, PAT: disable /dev/mem mmap RAM with PAT Ingo Molnar
2008-04-26 9:57 ` [git pull] x86 PAT changes Ingo Molnar
2008-04-26 13:40 ` Gabriel C
2008-04-26 14:42 ` Ingo Molnar
2008-04-26 15:37 ` Gabriel C
2008-04-26 15:41 ` Ingo Molnar [this message]
2008-04-26 16:43 ` Linus Torvalds
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