[Xen-devel] Question about x86_compat

[beth kon <eak@xxxxxxxxxx>]

arch_setup_meminit ignores the return code from x86_compat. Is this 
intentional? I see that the message printed in x86_compat is a warning 
if the do_domctl fails, so assume ignoring the return code in 
arch_setup_meminit may be intentional. If so, what does this imply when 
a 32 bit guest attempts to start on a 64 bit machine?
I followed up the call chain from x86_compat (trying to understand its 
intent) and it appears to be a pretty integral part of creating any 
domain, so I assume that XEN_DOMCTL_set_address_size is the call that 
actually specifies to Xen whether a domain is 32 or 64? So if that call 
fails, is the domain just set to be the machine's native size by 
default? But what would that mean for a 32 on 64 guest?
I hope my questions are clear. This area is a little muddy for me. Thanks!

--
Elizabeth Kon (Beth)
IBM Linux Technology Center
Open Hypervisor Team
email: eak@xxxxxxxxxx


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