In place kexec

Vivek Goyal vgoyal at
Fri Jul 30 14:34:46 EDT 2010

On Fri, Jul 30, 2010 at 11:21:42AM -0700, Eric W. Biederman wrote:
> David Woodhouse <dwmw2 at> writes:
> > 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.
> Depends on the IOMMU.  There are several dinky IOMMUs that when you
> shut them off DMA simply goes around them, and is not stopped.

I think last time we were discussing this for AMD IOMMU where if you
disable IOMMU, it just kind of become pass through with 1:1 mapping of


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