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xen-users
Re: [Xen-users] Re: [Xen-devel] VMX Hardware
Keir Fraser wrote:
On 14 Aug 2005, at 13:23, Mogens Valentin wrote:
I assume by VMX, you're talking about cpu/hardware with HW-support
for virtualisation, i.e. Intels Vanderbilt Technology (VT) and AMD'
Pacifica. If so, it's clear to me that AMD will be leading, because
of it's onchip memory controller, and hence reduced needs for
software support to do the page switching, for which Intel needs
quite a lot of software to emulate.
Not sure what you mean. Both technologies require the hypervisor to
maintain shadow page tables.
The Pacifica spec does mention optional hardware support for "Nested
Page Tables" which is essentially hardware shadow page tables.
Should be interesting to see the performance difference between
software/hardware shadow page tables.
It's worth noting that AMD has just released a simulator for (SimNow)
that has virtualization support. Perhaps one of the AMD guys on the
list can confirm whether SimNow has enough Pacifica support for Xen
development?
Regards,
Anthony Liguori
-- Keir
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