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KVM: VMX: Save and restore tr selector across mode switches
When emulating real mode we play with tr hidden state, but leave
tr.selector alone. That works well, except for save/restore, since
loading TR writes it to the hidden state in vmx->rmode.
Fix by also saving and restoring the tr selector; this makes things
more consistent and allows migration to work during the early
boot stages of Windows XP.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>