From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.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 13:33:01 -0700 [thread overview]
Message-ID: <5085AD7D.106@zytor.com> (raw)
In-Reply-To: <87fw56fduo.fsf@xmission.com>
On 10/22/2012 01:31 PM, Eric W. Biederman wrote:
>>
>> IIRC Fenghua experimented with that and it didn't work. Not all BIOSes
>> use that bit to determine BSP-ness.
>
> What does a BIOS have to do with anything?
>
> The practical issue here is does an INIT IPI cause the cpu to go into
> startup-ipi-wait or to start booting at 4G-16 bytes.
>
> For dealing with BIOSen we may still need to use the bootstrap processor
> for firmware calls, cpu suspend, and other firmware weirdness, but that
> should all be completely orthogonal to the behavior to what happens
> when an INIT IPI is sent to the cpu.
>
> The only firmware problem I can imagine having is cpu virtualization
> bug.
>
The whole problem is that some BIOSes go wonky after receiving an INIT
(as in INIT-SIPI-SIPI) to the BSP.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org,
x86@kernel.org, mingo@elte.hu, tglx@linutronix.de,
len.brown@intel.com, fenghua.yu@intel.com, vgoyal@redhat.com,
grant.likely@secretlab.ca, rob.herring@calxeda.com
Subject: Re: [PATCH v1 2/2] x86, apic: Disable BSP if boot cpu is AP
Date: Mon, 22 Oct 2012 13:33:01 -0700 [thread overview]
Message-ID: <5085AD7D.106@zytor.com> (raw)
In-Reply-To: <87fw56fduo.fsf@xmission.com>
On 10/22/2012 01:31 PM, Eric W. Biederman wrote:
>>
>> IIRC Fenghua experimented with that and it didn't work. Not all BIOSes
>> use that bit to determine BSP-ness.
>
> What does a BIOS have to do with anything?
>
> The practical issue here is does an INIT IPI cause the cpu to go into
> startup-ipi-wait or to start booting at 4G-16 bytes.
>
> For dealing with BIOSen we may still need to use the bootstrap processor
> for firmware calls, cpu suspend, and other firmware weirdness, but that
> should all be completely orthogonal to the behavior to what happens
> when an INIT IPI is sent to the cpu.
>
> The only firmware problem I can imagine having is cpu virtualization
> bug.
>
The whole problem is that some BIOSes go wonky after receiving an INIT
(as in INIT-SIPI-SIPI) to the BSP.
-hpa
next prev parent reply other threads:[~2012-10-22 20:33 UTC|newest]
Thread overview: 62+ 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 ` 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 ` HATAYAMA Daisuke
2012-10-16 4:35 ` [PATCH v1 2/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2012-10-16 4:35 ` HATAYAMA Daisuke
2012-10-22 20:04 ` Eric W. Biederman
2012-10-22 20:04 ` Eric W. Biederman
2012-10-22 20:16 ` H. Peter Anvin
2012-10-22 20:16 ` H. Peter Anvin
2012-10-22 20:31 ` Eric W. Biederman
2012-10-22 20:31 ` Eric W. Biederman
2012-10-22 20:33 ` H. Peter Anvin [this message]
2012-10-22 20:33 ` H. Peter Anvin
2012-10-22 20:38 ` H. Peter Anvin
2012-10-22 20:38 ` H. Peter Anvin
2012-10-22 20:43 ` Eric W. Biederman
2012-10-22 20:43 ` Eric W. Biederman
2012-10-22 20:47 ` H. Peter Anvin
2012-10-22 20:47 ` H. Peter Anvin
2012-10-22 21:29 ` Eric W. Biederman
2012-10-22 21:29 ` Eric W. Biederman
2012-10-23 0:35 ` H. Peter Anvin
2012-10-23 0:35 ` H. Peter Anvin
2012-10-26 3:24 ` HATAYAMA Daisuke
2012-10-26 3:24 ` HATAYAMA Daisuke
2012-10-26 4:13 ` Eric W. Biederman
2012-10-26 4:13 ` Eric W. Biederman
2013-03-11 1:07 ` HATAYAMA Daisuke
2013-03-11 1:07 ` HATAYAMA Daisuke
2013-03-11 2:13 ` HATAYAMA Daisuke
2013-03-11 2:13 ` HATAYAMA Daisuke
2013-03-11 4:11 ` H. Peter Anvin
2013-03-11 4:11 ` H. Peter Anvin
2012-10-16 4:51 ` [PATCH v1 0/2] " Yu, Fenghua
2012-10-16 4:51 ` Yu, Fenghua
2012-10-16 5:03 ` HATAYAMA Daisuke
2012-10-16 5:03 ` HATAYAMA Daisuke
2012-10-16 5:14 ` Yu, Fenghua
2012-10-16 5:14 ` Yu, Fenghua
2012-10-16 6:38 ` HATAYAMA Daisuke
2012-10-16 6:38 ` HATAYAMA Daisuke
2012-10-22 16:02 ` H. Peter Anvin
2012-10-22 16:02 ` H. Peter Anvin
2012-10-16 5:15 ` HATAYAMA Daisuke
2012-10-16 5:15 ` HATAYAMA Daisuke
2012-10-17 14:12 ` Vivek Goyal
2012-10-17 14:12 ` Vivek Goyal
2012-10-18 3:08 ` HATAYAMA Daisuke
2012-10-18 3:08 ` HATAYAMA Daisuke
2012-10-18 14:14 ` Vivek Goyal
2012-10-18 14:14 ` Vivek Goyal
2012-10-19 3:20 ` HATAYAMA Daisuke
2012-10-19 3:20 ` HATAYAMA Daisuke
2012-10-19 15:17 ` Vivek Goyal
2012-10-19 15:17 ` Vivek Goyal
2012-10-22 6:32 ` HATAYAMA Daisuke
2012-10-22 6:32 ` HATAYAMA Daisuke
2012-10-22 18:37 ` Vivek Goyal
2012-10-22 18:37 ` Vivek Goyal
2012-10-22 17:10 ` Michael Holzheu
2012-10-22 17:10 ` Michael Holzheu
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