[Xen-devel] x86 emulator and new isa additions

["Jan Beulich" <JBeulich@xxxxxxxx>]

Hi Keir,

so far the convention seems to be to assume that guest attempts to
execute instructions not supported by the underlying CPU would never
make it into the emulator. Is that really correct (in particular in the
context of real mode emulation, where it's not just single instructions
that get emulated)?

>From earlier work on the emulation code I seem to recall that it's mainly
the testing code that didn't like use of cpu_has_xyz in conditionals. I
would suppose that simply adding respective feature detection (and
boolean variables) to the testing code should get us around this
problem. Or would you see any better alternative?

Jan


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