From: ebiederm@xmission.com (Eric W. Biederman)
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: len.brown@intel.com, fenghua.yu@intel.com, x86@kernel.org,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
rob.herring@calxeda.com, grant.likely@secretlab.ca,
HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
tglx@linutronix.de, mingo@elte.hu, vgoyal@redhat.com
Subject: Re: [PATCH v1 2/2] x86, apic: Disable BSP if boot cpu is AP
Date: Mon, 22 Oct 2012 14:29:25 -0700 [thread overview]
Message-ID: <87mwze8abu.fsf@xmission.com> (raw)
In-Reply-To: <5085B0D0.9020508@zytor.com> (H. Peter Anvin's message of "Mon, 22 Oct 2012 13:47:12 -0700")
"H. Peter Anvin" <hpa@zytor.com> writes:
> On 10/22/2012 01:43 PM, Eric W. Biederman wrote:
>>
>> The reason the BIOSen go wonky is the INIT cause the cpu to go to the
>> reset vector at 4G-16 bytes. So it is very much expected that the
>> BIOSen start acting like you just came out of reset.
>>
>> If you can clear bit 8 of IA32_APIC_BASE_MSR and inform the cpu to not
>> send the cpu to 4G-16 bytes and instead send the cpu into it's magic
>> startup-ipi-wait mode then the BIOSen will not be involved on that path.
>>
>> It is a simple question of does the cpu support clearing bit 8
>> meaningfully.
>>
>> If the cpu allows bit 8 to be cleared and sends the cpu to the reset
>> vector on receipt of the INIT IPI I would call that a deviation from the
>> x86 cpu specification.
>>
>> So clearing bit 8 is not a question about BIOSen it is a question of can
>> we avoid the BIOSen, by using an obscure under-documented cpu feature.
>>
>
> As I said, I thought Fenghua tried that but it didn't work, experimentally.
Fair enough. You described the problem with clearing bit 8 in a weird
way.
If the best we can muster are fuzzy memories it may be worth revisiting.
Perhaps it works on enough cpu models to be interesting.
Eric
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2012-10-22 21:29 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-16 4:35 [PATCH v1 0/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2012-10-16 4:35 ` [PATCH v1 1/2] x86, apic: Introduce boot_cpu_is_bsp indicating whether boot cpu is BSP or not HATAYAMA Daisuke
2012-10-16 4:35 ` [PATCH v1 2/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2012-10-22 20:04 ` Eric W. Biederman
2012-10-22 20:16 ` H. Peter Anvin
2012-10-22 20:31 ` Eric W. Biederman
2012-10-22 20:33 ` H. Peter Anvin
2012-10-22 20:38 ` H. Peter Anvin
2012-10-22 20:43 ` Eric W. Biederman
2012-10-22 20:47 ` H. Peter Anvin
2012-10-22 21:29 ` Eric W. Biederman [this message]
2012-10-23 0:35 ` H. Peter Anvin
2012-10-26 3:24 ` HATAYAMA Daisuke
2012-10-26 4:13 ` Eric W. Biederman
2013-03-11 1:07 ` HATAYAMA Daisuke
2013-03-11 2:13 ` HATAYAMA Daisuke
2013-03-11 4:11 ` H. Peter Anvin
2012-10-16 4:51 ` [PATCH v1 0/2] " Yu, Fenghua
2012-10-16 5:03 ` HATAYAMA Daisuke
2012-10-16 5:14 ` Yu, Fenghua
2012-10-16 6:38 ` HATAYAMA Daisuke
2012-10-22 16:02 ` H. Peter Anvin
2012-10-16 5:15 ` HATAYAMA Daisuke
2012-10-17 14:12 ` Vivek Goyal
2012-10-18 3:08 ` HATAYAMA Daisuke
2012-10-18 14:14 ` Vivek Goyal
2012-10-19 3:20 ` HATAYAMA Daisuke
2012-10-19 15:17 ` Vivek Goyal
2012-10-22 6:32 ` HATAYAMA Daisuke
2012-10-22 18:37 ` Vivek Goyal
2012-10-22 17:10 ` Michael Holzheu
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=87mwze8abu.fsf@xmission.com \
--to=ebiederm@xmission.com \
--cc=d.hatayama@jp.fujitsu.com \
--cc=fenghua.yu@intel.com \
--cc=grant.likely@secretlab.ca \
--cc=hpa@zytor.com \
--cc=kexec@lists.infradead.org \
--cc=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=rob.herring@calxeda.com \
--cc=tglx@linutronix.de \
--cc=vgoyal@redhat.com \
--cc=x86@kernel.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