Re: [PATCH v8 29/46] KVM: selftests: Add selftests global for guest memory attributes capability
From: Fuad Tabba <hidden>
Date: 2026-06-24 19:26:41
Also in:
kvm, linux-coco, linux-doc, linux-kselftest, linux-mm, lkml
On Fri, 19 Jun 2026 at 01:32, Ackerley Tng via B4 Relay [off-list ref] wrote:
From: Sean Christopherson <seanjc@google.com> 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 <seanjc@google.com> Signed-off-by: Ackerley Tng <redacted>
Reviewed-by: Fuad Tabba <redacted> Cheers, /fuad
quoted hunk ↗ jump to hunk
--- 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 a56271c237ae9..51287fac8138a 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h@@ -115,6 +115,8 @@ struct guest_random_state { extern u32 guest_random_seed; extern struct guest_random_state guest_rng; +extern bool kvm_has_gmem_attributes; + struct guest_random_state new_guest_random_state(u32 seed); u32 guest_random_u32(struct guest_random_state *state);diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index d5bbc80b2bf1c..b73817f7bc803 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c@@ -24,6 +24,8 @@ u32 guest_random_seed; struct guest_random_state guest_rng; static u32 last_guest_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)@@ -521,6 +523,7 @@ struct kvm_vm *__vm_create(struct vm_shape shape, u32 nr_runnable_vcpus, } guest_rng = new_guest_random_state(guest_random_seed); sync_global_to_guest(vm, guest_rng); + sync_global_to_guest(vm, kvm_has_gmem_attributes); kvm_arch_vm_post_create(vm, nr_runnable_vcpus);@@ -2286,6 +2289,8 @@ void __attribute((constructor)) kvm_selftest_init(void) guest_random_seed = last_guest_seed = random(); pr_info("Random seed: 0x%x\n", guest_random_seed); + kvm_has_gmem_attributes = kvm_has_cap(KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIBUTES); + kvm_selftest_arch_init(); } --2.55.0.rc0.738.g0c8ab3ebcc-goog