Re: [Xen-devel] Question about implementation of 32-bit guests on 64-bit hypervisor (IDT-related)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7/12/07 14:05, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx> wrote:

> (1)  Which approach does Xen use?  Is it one of the above, or yet
> something else?

32-bit PV guests are run in compatibility mode. 32-bit HVM guests are run in
legacy mode, inside a VMX or SVM container.

> (2)  What are the configuration restrictions, if any, for running 32-bit
> guests on top of the 64-bit hypervisor?

32-bit PV guests are restricted to using the low 128GB of physical memory.
There's not even that restriction for 32-bit HVM guests.

 -- Keir



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