KVM: x86 emulator: Add Virtual-8086 mode of emulation
For some instructions CPU behaves differently for real-mode and virtual 8086. Let emulator know which mode cpu is in, so it will not poke into vcpu state directly. Signed-off-by: NGleb Natapov <gleb@redhat.com> Cc: stable@kernel.org Signed-off-by: NAvi Kivity <avi@redhat.com>
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