KVM: selftests: Fix build on architectures other than x86_64

The recent addition of support for testing with the x86 specific quirk
KVM_X86_QUIRK_SLOT_ZAP_ALL disabled in the generic memslot tests broke the
build of the KVM selftests for all other architectures:

In file included from include/kvm_util.h:8,
                 from include/memstress.h:13,
                 from memslot_modification_stress_test.c:21:
memslot_modification_stress_test.c: In function ‘main’:
memslot_modification_stress_test.c:176:38: error: ‘KVM_X86_QUIRK_SLOT_ZAP_ALL’ undeclared (first use in this function)
  176 |                                      KVM_X86_QUIRK_SLOT_ZAP_ALL);
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~

Add __x86_64__ guard defines to avoid building the relevant code on other
architectures.

Fixes: 61de4c34 ("KVM: selftests: Test memslot move in memslot_perf_test with quirk disabled")
Fixes: 218f6415 ("KVM: selftests: Allow slot modification stress test with quirk disabled")
Reported-by: Aishwarya TCV <aishwarya.tcv@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Message-ID: <20240930-kvm-build-breakage-v1-1-866fad3cc164@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/memslot_modification_stress_test.c

@@ -169,12 +169,14 @@ int main(int argc, char *argv[])
 		case 'i':
 			p.nr_iterations = atoi_positive("Number of iterations", optarg);
 			break;
+#ifdef __x86_64__
 		case 'q':
 			p.disable_slot_zap_quirk = true;
 
 			TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &
 				     KVM_X86_QUIRK_SLOT_ZAP_ALL);
 			break;
+#endif
 		case 'h':
 		default:
 			help(argv[0]);

tools/testing/selftests/kvm/memslot_perf_test.c

@@ -113,7 +113,9 @@ static_assert(ATOMIC_BOOL_LOCK_FREE == 2, "atomic bool is not lockless");
 static sem_t vcpu_ready;
 
 static bool map_unmap_verify;
+#ifdef __x86_64__
 static bool disable_slot_zap_quirk;
+#endif
 
 static bool verbose;
 #define pr_info_v(...)				\
@@ -579,8 +581,10 @@ static bool test_memslot_move_prepare(struct vm_data *data,
 	uint32_t guest_page_size = data->vm->page_size;
 	uint64_t movesrcgpa, movetestgpa;
 
+#ifdef __x86_64__
 	if (disable_slot_zap_quirk)
 		vm_enable_cap(data->vm, KVM_CAP_DISABLE_QUIRKS2, KVM_X86_QUIRK_SLOT_ZAP_ALL);
+#endif
 
 	movesrcgpa = vm_slot2gpa(data, data->nslots - 1);
 
@@ -971,11 +975,13 @@ static bool parse_args(int argc, char *argv[],
 		case 'd':
 			map_unmap_verify = true;
 			break;
+#ifdef __x86_64__
 		case 'q':
 			disable_slot_zap_quirk = true;
 			TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &
 				     KVM_X86_QUIRK_SLOT_ZAP_ALL);
 			break;
+#endif
 		case 's':
 			targs->nslots = atoi_paranoid(optarg);
 			if (targs->nslots <= 1 && targs->nslots != -1) {