APICBASE_X2APIC
vlapic->msr_apicbase &= ~APICBASE_X2APIC;
vlapic->msr_apicbase |= APICBASE_X2APIC;
#define x2apic(vlapic) (((vlapic)->msr_apicbase & APICBASE_X2APIC) ? 1 : 0)
apic_base |= APICBASE_X2APIC | APICBASE_ENABLED;
return ((apic_base & (APICBASE_X2APIC | APICBASE_ENABLED)) ==
(APICBASE_X2APIC | APICBASE_ENABLED));