buggy emulate_int_real

["Serge E. Hallyn" <serge@hallyn.com>]

Hi,

at https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/747090, it was
found that emulate_int_real() sometimes pushes the wrong eip when doing a
int.  Whereas with non-kvm qemu we push the next instruction after the
int, with kvm we push the addr of the instruction itself.

I thought it'd be simple to fix (bump the value being pushed :), but my
attempts at that have failed.  Well, the right value seemed to get pushed,
but kvm started to act rather funky.  So I just removed commits

a92601bb707f6f49fd5563ef3d09928e70cc222e
    KVM: VMX: Emulated real mode interrupt injection

63995653ade16deacaea5b49ceaf6376314593ac
    KVM: Add kvm_inject_realmode_interrupt() wrapper

6e154e56b4d7a6a28c54f0984e13d3f8defc4755
    KVM: x86 emulator: Add into, int, and int3 instructions (opcodes 0xcc-0xce)

and now it behaves as I'd expect.  There were a few commits tweaking these
functions, and I have not checked whether reverting some of those helps.

Anyone happen to know what exactly is going on?

thanks,
-serge