From: Vivek Goyal <vgoyal@redhat.com>
To: "Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>
Cc: 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,
"Eric W. Biederman" <ebiederm@xmission.com>,
hpa@zytor.com, mingo@elte.hu, Yinghai Lu <yinghai@kernel.org>,
akpm@linux-foundation.org
Subject: Re: [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path
Date: Wed, 7 Mar 2012 10:50:18 -0500 [thread overview]
Message-ID: <20120307155018.GA13430@redhat.com> (raw)
In-Reply-To: <4F573E1C.2060909@oss.ntt.co.jp>
On Wed, Mar 07, 2012 at 07:53:16PM +0900, Fernando Luis Vázquez Cao wrote:
> On 03/01/2012 08:19 AM, Eric W. Biederman wrote:
>
> >Don Zickus<dzickus@redhat.com> writes:
> >>It probably is, except I never hacked on idt code before and my assembly
> >>isn't that good. I have been trying to find examples to copy from to give
> >>it a try. So far I was using early_idt_handlers with early_printk to see
> >>if I could capture some printk messages while jumping from the first
> >>kernel to the second kernel (when the other early_idt_handlers would kick
> >>in for the second kernel).
> >>
> >>Tips? Better examples?
> >That is a particularly good example. When I took a quick look earlier
> >that is the first place we reload the idt in the kernel boot so that is
> >one of two places that needs to be modified.
>
> Hi Eric, Don
>
> Sorry for chiming in so late.
>
> We run into the same NMI problems and wrote some patches that tackle
> the kernel boot side of things. They have been extensively tested using
> qemu-kvm and things seem to be working as expected (after receiving an
> early NMI the kernel continues without problem; after the iret there is no
> stack corruption or register corruption).
What happens if NMI happens while we are still in purgatory code?
Thanks
Vivek
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WARNING: multiple messages have this Message-ID (diff)
From: Vivek Goyal <vgoyal@redhat.com>
To: "Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Don Zickus <dzickus@redhat.com>,
linux-tip-commits@vger.kernel.org,
Yinghai Lu <yinghai@kernel.org>,
mingo@elte.hu, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com,
akpm@linux-foundation.org, torvalds@linux-foundation.org,
tglx@linutronix.de
Subject: Re: [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path
Date: Wed, 7 Mar 2012 10:50:18 -0500 [thread overview]
Message-ID: <20120307155018.GA13430@redhat.com> (raw)
In-Reply-To: <4F573E1C.2060909@oss.ntt.co.jp>
On Wed, Mar 07, 2012 at 07:53:16PM +0900, Fernando Luis Vázquez Cao wrote:
> On 03/01/2012 08:19 AM, Eric W. Biederman wrote:
>
> >Don Zickus<dzickus@redhat.com> writes:
> >>It probably is, except I never hacked on idt code before and my assembly
> >>isn't that good. I have been trying to find examples to copy from to give
> >>it a try. So far I was using early_idt_handlers with early_printk to see
> >>if I could capture some printk messages while jumping from the first
> >>kernel to the second kernel (when the other early_idt_handlers would kick
> >>in for the second kernel).
> >>
> >>Tips? Better examples?
> >That is a particularly good example. When I took a quick look earlier
> >that is the first place we reload the idt in the kernel boot so that is
> >one of two places that needs to be modified.
>
> Hi Eric, Don
>
> Sorry for chiming in so late.
>
> We run into the same NMI problems and wrote some patches that tackle
> the kernel boot side of things. They have been extensively tested using
> qemu-kvm and things seem to be working as expected (after receiving an
> early NMI the kernel continues without problem; after the iret there is no
> stack corruption or register corruption).
What happens if NMI happens while we are still in purgatory code?
Thanks
Vivek
next prev parent reply other threads:[~2012-03-07 15:50 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
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 ` Vivek Goyal [this message]
2012-03-07 15:50 ` [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path 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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