Re: [Xen-devel] Help with CONFIG_COMPAT

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

CONFIG_COMPAT is always set for 64-bit hypervisor. You can consider it
equivalent to CONFIG_X86_64 really, but it's generally used to indicate
stuff relating to the compat shim.

Theoretically if CONFIG_COMPAT were not set then 64-bit Xen could not run
32-bit guests (dom0 or domU). But CONFIG_COMPAT is never disabled in
practice.

 -- Keir

On 08/10/2009 05:12, "Mukesh Rathor" <mukesh.rathor@xxxxxxxxxx> wrote:

> Can someone please clarify this. (yes/no):
> 
> For 64bit hypervisor:
> 
> 1. if CONFIG_COMPAT is set, then dom0 must be 32bit?
> 
> 
> 2. if CONFIG_COMPAT is not set, then dom0 must be 64bit?
> 
> 
> 3. if CONFIG_COMPAT is not set, then domU cannot be 32bit?
> 
> 
> thanks a lot,
> Mukesh
> 
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