In place kexec

H. Peter Anvin hpa at
Thu Jul 29 14:29:12 EDT 2010

On 07/29/2010 11:06 AM, Eric W. Biederman wrote:
> Thinking about this I am a bit surprised that you would find
> DMA left on from a disk driver.  Historically disks have been
> pretty good about shutting off in this scenario.
> Added to that typically we unmount all filesystems.
> Calling rmmod on the driver before the final kexec --exec
> could be interesting, and drivers much more reliably implement
> .remove than .shutdown.
> Network drivers are more likely to be a problem, but we should be
> downing all of the network interfaces before something happens.
> All of which is to say kexec-in-place has generally been a lot
> less hassle, because it is so similar to the normal case.

In particular, the supposed corruption comes from the "firmware logging"
feature in the qla2xxx driver.  I'd really like to understand if this is
a kexec problem or a qla2xxx problem.

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