Re: In place kexec

H. Peter Anvin
2010-07-29T18:29:41Z

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.

-hpa