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    SubjectRe: i686 quirk for AMD Geode
    On Wed, Nov 11, 2009 at 09:31:26PM -0800, H. Peter Anvin wrote:
    > On 11/11/2009 09:27 PM, Willy Tarreau wrote:
    > >
    > > Right. However we just noticed that with the KVM emulator, you
    > > can make it loop for a long time if you feed it with prefixes
    > > only. For instance, write a function which does zillions of 0x66
    > > (data size prefix) then return (0xC3) : 66 66 66 ... 66 C3.
    > >
    > > This is typically the sort of things we must be very careful about
    > > in emulators, because we don't want users to steal large amounts
    > > of system CPU time doing nothing.
    > >
    >
    > That is a (serious) bug in the KVM interpreter, and indeed the exact
    > kind of issues interpreters tend to have... which is why I'd like one
    > piece of code with one set of bugs, and more eyeballs on that one piece
    > of code so they can be fixed.

    Well, I could try to work on a fix (basically the same principle as in
    mine, with prefix flags), but I simply don't know how to test the code.
    I've never experimented with KVM yet and learned it embeds an emulator
    for the first time a few days ago in this thread :-/ If it's easy to
    make use of it, I'm not opposed to try.

    Willy



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