Re: [PATCH 1/2] VMware detection support for x86 and x86-64

[H. Peter Anvin]

Zachary Amsden wrote:
> On Thu, 2008-09-25 at 14:59 -0700, H. Peter Anvin wrote:
>
> > However, it is the particular use of this for detection use that is
> > utterly damning.  Using random I/O port probes for hardware detect
> > should have disappeared in the early 1990's, and it's really disturbing
> > that virtualization vendors -- not just VMWare -- are, in effect,
> > re-making all the mistakes hardware vendors did in the 1980's.
>
> It's not disturbing, it's expected.  Re-using old broken solutions happens all the time, they can be perfectly valid in some contexts.  The problem is that they tend to live on and evolve into a larger context where they break again.  Surely we can do better, but how to do that isn't always clear-cut.  DMI is a pretty good standard for this, but it still doesn't solve the problem in all contexts (userspace apps).

This, of course, is what CPUID is for.

	-hpa
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