Re: [PATCH] [HVM] Patches to make HVM capable of running OS/2.

[Keir Fraser <keir@xensource.com>]

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On 16/3/07 12:45, "Trolle Selander" <trolle.selander@gmail.com> wrote:

> I thought they were marked as reserved in the e820 map right now, but now that
> I checked, you're right that they're not mentioned, which means they're
> actually nearly as "unprotected" from a modern OS as from a pre-e820-aware one
> like OS/2. Nasty.
> In any case, I still don't see why the ioreq and buffered io pages should be
> inside the guest's memory space at all. What's the issue with keeping them
> completely outside the guest's visible RAM and only shared between HV & Dom0?

If the pages belong to the domU then they have to be part of its
pseudophysical address space, otherwise dom0 cannot map them (since HVM
pages are always mapped by pfn, not by mfn).

We could make the pages belong to dom0, or to Xen, I suppose, but that¹s not
the road we¹ve gone down and there¹s not really any reason to change now. We
should just keep the pages out of the guest¹s way so he doesn¹t accidentally
use them as RAM or map on top of them!

 -- Keir

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