From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Don Zickus" <dzickus@redhat.com>,
akpm@linux-foundation.org, linux-tip-commits@vger.kernel.org,
"Yinghai Lu" <yinghai@kernel.org>,
"Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
mingo@redhat.com, tglx@linutronix.de,
torvalds@linux-foundation.org, mingo@elte.hu,
"Vivek Goyal" <vgoyal@redhat.com>
Subject: Re: [PATCH 1/2] boot: ignore early NMIs
Date: Mon, 12 Mar 2012 13:02:53 -0700 [thread overview]
Message-ID: <4F5E566D.9060209@zytor.com> (raw)
In-Reply-To: <m1ipi9prrl.fsf@fess.ebiederm.org>
On 03/12/2012 12:02 PM, Eric W. Biederman wrote:
>
> Disabling NMI generation in the LAPIC is fine, and for the short term
> I don't even have a problem with disabling the entire LAPIC as all of
> our platforms seem to have code for completely reprogramming it.
>
> At the same time there have been cases like the i8259 routed through
> the ExtInt pin of the lapci that we haven't been given programming
> information about and that if we want to work we should avoid touching.
>
I'm pretty sure that information is in the SDM (I'm looking at it now.)
You can also block NMI though this route, since external NMI really is
LINT1 and hence is routed through the LAPIC; you can mask it by clearing
bit 16 in LVT LINT1 as described in the SDM.
-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: "Vivek Goyal" <vgoyal@redhat.com>,
"Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>,
"Don Zickus" <dzickus@redhat.com>,
linux-tip-commits@vger.kernel.org, torvalds@linux-foundation.org,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
mingo@redhat.com, tglx@linutronix.de, mingo@elte.hu,
"Yinghai Lu" <yinghai@kernel.org>,
akpm@linux-foundation.org
Subject: Re: [PATCH 1/2] boot: ignore early NMIs
Date: Mon, 12 Mar 2012 13:02:53 -0700 [thread overview]
Message-ID: <4F5E566D.9060209@zytor.com> (raw)
In-Reply-To: <m1ipi9prrl.fsf@fess.ebiederm.org>
On 03/12/2012 12:02 PM, Eric W. Biederman wrote:
>
> Disabling NMI generation in the LAPIC is fine, and for the short term
> I don't even have a problem with disabling the entire LAPIC as all of
> our platforms seem to have code for completely reprogramming it.
>
> At the same time there have been cases like the i8259 routed through
> the ExtInt pin of the lapci that we haven't been given programming
> information about and that if we want to work we should avoid touching.
>
I'm pretty sure that information is in the SDM (I'm looking at it now.)
You can also block NMI though this route, since external NMI really is
LINT1 and hence is routed through the LAPIC; you can mask it by clearing
bit 16 in LVT LINT1 as described in the SDM.
-hpa
next prev parent reply other threads:[~2012-03-12 20:03 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-11 23:09 [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path tip-bot for Don Zickus
2012-02-12 1:04 ` Yinghai Lu
2012-02-12 1:04 ` Yinghai Lu
2012-02-12 3:13 ` Eric W. Biederman
2012-02-12 3:13 ` Eric W. Biederman
2012-02-12 4:17 ` Yinghai Lu
2012-02-12 4:17 ` Yinghai Lu
2012-02-13 12:52 ` Eric W. Biederman
2012-02-13 12:52 ` Eric W. Biederman
2012-02-13 16:51 ` Yinghai Lu
2012-02-13 16:51 ` Yinghai Lu
2012-02-13 18:16 ` Yinghai Lu
2012-02-13 18:16 ` Yinghai Lu
2012-02-16 17:27 ` Don Zickus
2012-02-16 17:27 ` Don Zickus
2012-02-16 21:53 ` Yinghai Lu
2012-02-16 21:53 ` Yinghai Lu
2012-02-16 21:56 ` Don Zickus
2012-02-16 21:56 ` Don Zickus
2012-02-17 3:38 ` Eric W. Biederman
2012-02-17 3:38 ` Eric W. Biederman
2012-02-17 12:41 ` Eric W. Biederman
2012-02-17 12:41 ` Eric W. Biederman
2012-02-17 15:49 ` HATAYAMA Daisuke
2012-02-17 15:49 ` HATAYAMA Daisuke
2012-02-17 20:18 ` Don Zickus
2012-02-17 20:18 ` Don Zickus
2012-02-20 5:17 ` HATAYAMA Daisuke
2012-02-20 5:17 ` HATAYAMA Daisuke
2012-02-20 15:24 ` Don Zickus
2012-02-20 15:24 ` Don Zickus
2012-02-17 19:54 ` Don Zickus
2012-02-17 19:54 ` Don Zickus
2012-02-18 3:21 ` Eric W. Biederman
2012-02-18 3:21 ` Eric W. Biederman
2012-02-20 15:14 ` Don Zickus
2012-02-20 15:14 ` Don Zickus
2012-02-21 8:01 ` Eric W. Biederman
2012-02-21 8:01 ` Eric W. Biederman
2012-02-21 13:59 ` Don Zickus
2012-02-21 13:59 ` Don Zickus
2012-02-29 23:19 ` Eric W. Biederman
2012-02-29 23:19 ` Eric W. Biederman
2012-03-07 10:53 ` Fernando Luis Vázquez Cao
2012-03-07 10:53 ` Fernando Luis Vázquez Cao
2012-03-07 10:54 ` [PATCH 1/2] boot: ignore early NMIs Fernando Luis Vázquez Cao
2012-03-07 10:54 ` Fernando Luis Vázquez Cao
2012-03-07 10:56 ` [PATCH 2/2] boot: add early NMI counter Fernando Luis Vázquez Cao
2012-03-07 10:56 ` Fernando Luis Vázquez Cao
2012-03-08 4:50 ` Eric W. Biederman
2012-03-08 4:50 ` Eric W. Biederman
2012-03-08 6:00 ` Fernando Luis Vázquez Cao
2012-03-08 6:00 ` Fernando Luis Vázquez Cao
2012-03-08 4:41 ` [PATCH 1/2] boot: ignore early NMIs Eric W. Biederman
2012-03-08 4:41 ` Eric W. Biederman
2012-03-08 5:53 ` Fernando Luis Vázquez Cao
2012-03-08 5:53 ` Fernando Luis Vázquez Cao
2012-03-08 16:35 ` Eric W. Biederman
2012-03-08 16:35 ` Eric W. Biederman
2012-03-09 9:31 ` Fernando Luis Vázquez Cao
2012-03-09 9:31 ` Fernando Luis Vázquez Cao
2012-03-09 9:51 ` [PATCH 1/3] boot: fortify early_idt_handlers definition Fernando Luis Vázquez Cao
2012-03-09 9:51 ` Fernando Luis Vázquez Cao
2012-03-09 9:55 ` [PATCH 2/3] boot: ignore early NMIs Fernando Luis Vázquez Cao
2012-03-09 9:55 ` Fernando Luis Vázquez Cao
2012-03-09 10:01 ` [PATCH 3/3] boot: add early NMI counter Fernando Luis Vázquez Cao
2012-03-09 10:01 ` Fernando Luis Vázquez Cao
2012-03-09 20:52 ` [PATCH 1/2] boot: ignore early NMIs H. Peter Anvin
2012-03-09 20:52 ` H. Peter Anvin
2012-03-12 5:43 ` Fernando Luis Vázquez Cao
2012-03-12 5:43 ` Fernando Luis Vázquez Cao
2012-03-12 5:49 ` H. Peter Anvin
2012-03-12 5:49 ` H. Peter Anvin
2012-03-12 6:14 ` Fernando Luis Vázquez Cao
2012-03-12 6:14 ` Fernando Luis Vázquez Cao
2012-03-12 13:36 ` Vivek Goyal
2012-03-12 13:36 ` Vivek Goyal
2012-03-12 19:02 ` Eric W. Biederman
2012-03-12 19:02 ` Eric W. Biederman
2012-03-12 19:58 ` Vivek Goyal
2012-03-12 19:58 ` Vivek Goyal
2012-03-12 20:02 ` H. Peter Anvin [this message]
2012-03-12 20:02 ` H. Peter Anvin
2012-03-12 18:40 ` H. Peter Anvin
2012-03-12 18:40 ` H. Peter Anvin
2012-03-12 20:01 ` Eric W. Biederman
2012-03-12 20:01 ` Eric W. Biederman
2012-03-12 20:04 ` H. Peter Anvin
2012-03-12 20:04 ` H. Peter Anvin
2012-03-12 20:16 ` H. Peter Anvin
2012-03-12 20:16 ` H. Peter Anvin
2012-03-13 2:11 ` Fernando Luis Vázquez Cao
2012-03-13 2:11 ` Fernando Luis Vázquez Cao
2012-03-13 13:33 ` Don Zickus
2012-03-13 13:33 ` Don Zickus
2012-03-15 0:43 ` Simon Horman
2012-03-15 0:43 ` Simon Horman
2012-03-13 1:43 ` Fernando Luis Vázquez Cao
2012-03-13 1:43 ` Fernando Luis Vázquez Cao
2012-03-12 14:41 ` Don Zickus
2012-03-12 14:41 ` Don Zickus
2012-03-07 15:50 ` [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path Vivek Goyal
2012-03-07 15:50 ` Vivek Goyal
2012-03-07 18:27 ` Yinghai Lu
2012-03-07 18:27 ` Yinghai Lu
2012-03-08 1:29 ` Fernando Luis Vázquez Cao
2012-03-08 1:29 ` Fernando Luis Vázquez Cao
2012-03-09 0:59 ` HATAYAMA Daisuke
2012-03-09 0:59 ` HATAYAMA Daisuke
2012-03-09 2:48 ` Eric W. Biederman
2012-03-09 2:48 ` Eric W. Biederman
2012-02-12 11:12 ` Ingo Molnar
2012-02-12 11:12 ` Ingo Molnar
2012-02-13 15:28 ` Don Zickus
2012-02-13 15:28 ` Don Zickus
2012-02-13 16:52 ` Yinghai Lu
2012-02-13 16:52 ` Yinghai Lu
2012-02-13 22:12 ` Don Zickus
2012-02-13 22:12 ` Don Zickus
2012-02-13 22:51 ` Don Zickus
2012-02-13 22:51 ` Don Zickus
2012-02-16 2:53 ` Don Zickus
2012-02-16 2:53 ` Don Zickus
2012-02-16 18:43 ` Yinghai Lu
2012-02-16 18:43 ` Yinghai Lu
2012-02-16 21:41 ` Don Zickus
2012-02-16 21:41 ` Don Zickus
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