[Xen-devel] Fix 32-bit overflow in 64-bit Xen running 32-bit guest.

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

One of our clients found a problem trying to start OS/2 - we get an
overflow when running a 64-bit hypervisor and 32-bit guest if the RIP is
"large" - this should result in a 32-bit value that is truncated, but
instead results in a 33-bit value that causes "strange" results and
eventually a crash of the guest. 

Attached is a proposed patch that fixes the overflow. I'm not sure if
it's worth trying to #if _x86_64_ around it to avoid the extra vmcb
accesses - but if that's worth doing, there would be a bigger gain from
moving this function from emulate.c into a header-file and making it
inline... ;-)

Comments and criticisms welcome... 

Patch is based on 11619. 

--
Mats

Attachment: rip2ptr.patch
Description: rip2ptr.patch

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