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enter_lmode() and exit_lmode() modify the guest's EFER.LMA before calling
vmx_set_efer(). However, the latter function depends on the value of EFER.LMA
to determine whether MSR_KERNEL_GS_BASE needs reloading, via
vmx_load_host_state(). With EFER.LMA changing under its feet, it took the
wrong choice and corrupted userspace's %gs.
This causes 32-on-64 host userspace to fault.
Fix not touching EFER.LMA; instead ask vmx_set_efer() to change it.
Signed-off-by: Avi Kivity <avi@redhat.com>
da38f43859