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xen-devel
RE: [Xen-devel] privileged op emulation
[snip]
> > Are you in this particular case thinking of "weird" side
> effects like
> > the OUT instruction is actually causing a SMI, in which the
> > user-registers are being used for arguments?
>
> Yes, that's exactly the case I'm thinking about. I have a
> userspace application that basically does:
> iopl()
> ...
> Setup registers
> cli
> out -> trigger SMI which looks at registers ...
>
I think the CORRECT way to solve this is to have a particular port(set)
(administered by the system administrator in the form of a command-line
parameter to the Xen kernel perhaps) be allowed as "direct access" from
the user-mode kernel, so that you get the correct behaviour. Most
anything else would be somewhat wrong in one way or another
[stack-pointer, instruction pointer at the very least would be wrong].
--
Mats
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