KVM: selftests: Use "standard" min virtual address for CPUID test alloc

Use KVM_UTIL_MIN_ADDR as the minimum for x86-64's CPUID array.  The
system page size was likely used as the minimum because _something_ had
to be provided.  Increasing the min from 0x1000 to 0x2000 should have no
meaningful impact on the test, and will allow changing vm_vaddr_alloc()
to use KVM_UTIL_MIN_VADDR as the default.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622200529.3650424-11-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/x86_64/get_cpuid_test.c

@@ -145,8 +145,7 @@ static void run_vcpu(struct kvm_vm *vm, uint32_t vcpuid, int stage)
 struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva, struct kvm_cpuid2 *cpuid)
 {
 	int size = sizeof(*cpuid) + cpuid->nent * sizeof(cpuid->entries[0]);
-	vm_vaddr_t gva = vm_vaddr_alloc(vm, size,
-					getpagesize(), 0, 0);
+	vm_vaddr_t gva = vm_vaddr_alloc(vm, size, KVM_UTIL_MIN_VADDR, 0, 0);
 	struct kvm_cpuid2 *guest_cpuids = addr_gva2hva(vm, gva);
 
 	memcpy(guest_cpuids, cpuid, size);