[PATCH v10 25/41] KVM: selftests: Add selftests global for guest memory attributes capability

From: Sean Christopherson <[email protected]>

Add a global variable, kvm_has_gmem_attributes, to make the result of
checking for KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIBUTES available to all tests.

kvm_has_gmem_attributes is true if guest_memfd tracks memory attributes, as
opposed to VM-level tracking.

This global variable is synced to the guest for testing convenience, to
avoid introducing subtle bugs when host/guest state is desynced.

Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Fuad Tabba <[email protected]>
Tested-by: Shivank Garg <[email protected]>
Signed-off-by: Ackerley Tng <[email protected]>
---
 tools/testing/selftests/kvm/include/test_util.h | 2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c      | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index a6a3e16578959..d5825211f2727 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -116,6 +116,8 @@ struct kvm_random_state {
 extern u32 kvm_random_seed;
 extern struct kvm_random_state kvm_rng;
 
+extern bool kvm_has_gmem_attributes;
+
 struct kvm_random_state new_kvm_random_state(u32 seed);
 u32 kvm_random_u32(struct kvm_random_state *state);
 
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 08d0bbcd421ea..cd468b2bb8343 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -32,6 +32,8 @@ static void kvm_seed_rng(u32 seed)
 	kvm_rng = new_kvm_random_state(kvm_random_seed);
 }
 
+bool kvm_has_gmem_attributes;
+
 static size_t vcpu_mmap_sz(void);
 
 int __open_path_or_exit(const char *path, int flags, const char *enoent_help)
@@ -527,6 +529,7 @@ struct kvm_vm *__vm_create(struct vm_shape shape, u32 nr_runnable_vcpus,
 		kvm_seed_rng(kvm_random_seed);
 
 	sync_global_to_guest(vm, kvm_rng);
+	sync_global_to_guest(vm, kvm_has_gmem_attributes);
 
 	kvm_arch_vm_post_create(vm, nr_runnable_vcpus);
 
@@ -2311,6 +2314,8 @@ void __attribute((constructor)) kvm_selftest_init(void)
 	srandom(time(0));
 	kvm_seed_rng(random());
 
+	kvm_has_gmem_attributes = kvm_has_cap(KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIBUTES);
+
 	kvm_selftest_arch_init();
 }
 

-- 
2.55.0.654.g21b8a5bc05-goog