linux-kernel - [RFC PATCH v1 29/37] KVM: selftests: Add selftests global for guest memory attributes capability

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Message-ID: <5656d432df1217c08da0cc2694fd79948bfd686f.1760731772.git.ackerleytng@google.com>
Date: Fri, 17 Oct 2025 13:12:10 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
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Subject: [RFC PATCH v1 29/37] KVM: selftests: Add selftests global for guest
 memory attributes capability

From: Sean Christopherson <seanjc@...gle.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 KVM tracks memory attributes at the VM
level, as opposed to per-guest_memfd tracking.

This global variable is meant to be used by the host only.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 tools/testing/selftests/kvm/include/test_util.h | 2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c      | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index b4872ba8ed124..2871a42928471 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -113,6 +113,8 @@ struct guest_random_state {
 extern uint32_t guest_random_seed;
 extern struct guest_random_state guest_rng;
 
+extern bool kvm_has_gmem_attributes;
+
 struct guest_random_state new_guest_random_state(uint32_t seed);
 uint32_t 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 19c0445c0b296..c9c59f3ecd14f 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -24,6 +24,8 @@ uint32_t guest_random_seed;
 struct guest_random_state guest_rng;
 static uint32_t 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)
@@ -2321,6 +2323,8 @@ 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();
 }
 
-- 
2.51.0.858.gf9c4a03a3a-goog