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Re: [Xen-devel] 32/64-bit hypercall interface

  • To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • From: Kip Macy <kip.macy@xxxxxxxxx>
  • Date: Mon, 3 Oct 2005 12:34:43 -0700
  • Cc: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, Andrei Petrov <andrei@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Hollis Blanchard <hollisb@xxxxxxxxxx>
  • Delivery-date: Mon, 03 Oct 2005 19:32:19 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

You also said you would never support PAE. PAE is second-only to SMP support on the list of customer requirements. There may be a compelling reason not to, but superficially running many 32-bit paravirtualized guests on a 64-bit HV makes a great deal of sense.


There's the rub: we don't expect to ever want to provide 32-bit x86 ABI
compatibility on 64-bit x86 Xen. We will not be supporting 32-bit
paravirtualised guests on 64-bit x86 Xen, and we've taken the approach
of requiring separate 32- and 64-bit toolsets (which isn't too painful
on x86 since full-fledged 64-bit filesystems are quite easy to come

Really this sounds to me like this is only going to be a problem for
ppc. That given, knocking up a translation script to import the
interfaces into your 32-bit toolchain does seem worthy of
consideration. It wouldn't allow you to use the same tool binaries on
both 32- and 64-bit ppc Xen, but I don't know how much you actually
care about that...

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