In place kexec

[Vivek Goyal]

On Fri, Jul 30, 2010 at 11:21:42AM -0700, Eric W. Biederman wrote:
> David Woodhouse <dwmw2 at infradead.org> 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
addresses.

Vivek