cpu_vabits
#define XRANGE_SHADOW_SHIFT min(cpu_vabits, VA_BITS)
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
#define TASK_SIZE64 (0x1UL << ((cpu_vabits > VA_BITS) ? VA_BITS : cpu_vabits))
c->vabits = cpu_vabits;
__ua_limit = ~((1ull << cpu_vabits) - 1);
cpu_pabits + 1, cpu_vabits + 1);
kvm->arch.gpa_size = BIT(cpu_vabits);