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When we allocate a reserved_va for the guest, the kernel will likely choose an address well above 4G. At which point we must use a pair of movabsq+addq to form the host address. If we have OS support, set up a segment register to point to guest_base instead. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>