Re: [Xen-devel] Testing nested virtualization on Intel CPUs

[Tim Deegan <tim@xxxxxxx>]

At 22:18 -0700 on 20 Sep (1316557136), AP wrote:
> > Yes, booting Xen as a nested guest is very slow at startup, because of
> > how Xen relocates the bottom 1MB at boot time.  You might find that
> > 32-bit Xen boots faster.
> 
> Could please expand a little on why the relocation causes it to slow down?

IIRC, the relocation itself is very slow because Xen just copies the low
1MB, which includes the VGA hole, so there are a lot of emulated reads.

Tim.

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