Re: [PATCH 23/25] [PATCH] paravirt hooks for arch initialization

On Fri, 10 Aug 2007 15:08:35 -0300
"Glauber de Oliveira Costa" [off-list ref] wrote:

On 8/9/07, Alan Cox [off-list ref] wrote:

quoted

quoted

What's the EBDA actually used for?  The only place which seems to use
ebda_addr is in the e820 code to avoid that area as RAM.

It belongs to the firmware.

Wouldn't it be better, then, to just skip this step unconditionally if
we are running a paravirtualized guest? What do we from doing it?

An EBDA is an optional BIOS feature so providing you virtualise the
relevant entry in the zero page (to avoid guest applications trying to
scan the EBDA for some system tables they may want to use like DMI) as
a zero entry you can ignore the EBDA.

That probably the right thing to do since the host EBDA won't match the
guest environment and the guest might migrate anyway