apic: Fix access to non-existent APIC When running with -M isapc, there is no env->apic_state. Fix cpu_get/set_apic_* helpers to handle this corner case gracefully. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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