From: "H. Peter Anvin" <hpa@zytor.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>,
Neil Horman <nhorman@redhat.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
Simon Horman <horms@verge.net.au>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-driver@qlogic.com, Vivek Goyal <vgoyal@redhat.com>,
Andrew Vasquez <andrew.vasquez@qlogic.com>
Subject: Re: In place kexec
Date: Fri, 30 Jul 2010 13:42:10 -0700 [thread overview]
Message-ID: <4C533922.10901@zytor.com> (raw)
In-Reply-To: <1280508817.28006.0.camel@macbook.infradead.org>
On 07/30/2010 09:53 AM, David Woodhouse wrote:
> On Thu, 2010-07-29 at 21:41 -0700, Eric W. Biederman wrote:
>> There isn't a bus master shut off at the core level.
>
> Effectively, there is if you have an IOMMU.
With the "core level" I meant Linux kernel code, as opposed to hardware
level which is slightly different; I meant it would make sense to at
least set the bus master control bit (PCI_COMMAND_MASTER) to zero before
kexec.
I also agree that reboot and kexec are different; the requirements for
kexec are really much more strict.
-hpa
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next prev parent reply other threads:[~2010-07-30 20:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-28 21:57 In place kexec H. Peter Anvin
2010-07-28 22:02 ` Eric W. Biederman
2010-07-29 13:43 ` Neil Horman
2010-07-29 15:03 ` H. Peter Anvin
2010-07-29 15:06 ` Neil Horman
2010-07-29 17:51 ` H. Peter Anvin
2010-07-29 18:06 ` Eric W. Biederman
2010-07-29 18:29 ` H. Peter Anvin
2010-07-29 19:16 ` Vivek Goyal
2010-07-29 19:51 ` Eric W. Biederman
2010-07-29 19:55 ` Randy Dunlap
2010-07-30 3:38 ` H. Peter Anvin
2010-07-30 4:41 ` Eric W. Biederman
2010-07-30 5:04 ` H. Peter Anvin
2010-07-30 16:30 ` Eric W. Biederman
2010-07-30 16:41 ` H. Peter Anvin
2010-07-30 18:36 ` Eric W. Biederman
2010-07-30 22:52 ` Andrew Vasquez
2010-07-30 23:25 ` H. Peter Anvin
2010-07-30 23:40 ` Eric W. Biederman
2010-07-30 16:53 ` David Woodhouse
2010-07-30 18:21 ` Eric W. Biederman
2010-07-30 18:34 ` Vivek Goyal
2010-07-30 18:50 ` David Woodhouse
2010-07-30 18:56 ` Vivek Goyal
2010-07-30 19:17 ` David Woodhouse
2010-07-30 19:39 ` Eric W. Biederman
2010-07-30 19:46 ` David Woodhouse
2010-07-30 20:08 ` Eric W. Biederman
2010-07-30 20:15 ` David Woodhouse
2010-07-30 21:11 ` H. Peter Anvin
2010-07-30 20:42 ` H. Peter Anvin [this message]
2010-07-30 21:18 ` Khalid Aziz
2010-07-30 21:44 ` Khalid Aziz
[not found] ` <20120425211512.GA8583@ldl.usa.hp.com>
2012-04-25 22:06 ` Vivek Goyal
2010-07-29 20:06 ` H. Peter Anvin
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