KVM task switching support

Hi,
the following patchs add support for hardware task switching inside kvm,

there is one issue with this patch that i couldnt figure why it is happen
and it related to ghost, it seems like ghost after 2 task switchs have the same segment values as well as registers like qemu have, but for some reason after this everything get messed inside kvm. (if someone will find answer for this i will be very happy)

beside this i tested this patch on freedos and everything looked alright.

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