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a=ed25519-sha256; t=1774563861; l=2424; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=SPrXtBzhAZ8kM/S0wIFvUys1KOsEIn60uKsPIVirly4=; b=Pb2Ke7FYWhiSBLICKGMsXf4XmOQ7g9IKaopuyp04/7PZlASOeNyYFutPu026ZSgYzfo3iSfAk 84jt/X+M0iCCjjNze4tzM8Q5uhhhTW0IjXQ1s4Nh16h/Gz+oHiW+LZG X-Mailer: b4 0.14.3 Message-ID: <20260326-gmem-inplace-conversion-v4-21-e202fe950ffd@google.com> Subject: [PATCH RFC v4 21/44] KVM: selftests: Add selftests global for guest memory attributes capability From: Ackerley Tng To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, ira.weiny@intel.com, jmattson@google.com, jroedel@suse.de, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Jason Gunthorpe , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Ackerley Tng Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Sean Christopherson 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 Signed-off-by: Ackerley Tng --- 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/testin= g/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; =20 +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); =20 diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/sel= ftests/kvm/lib/kvm_util.c index 82d6945efa29a..404efb5318f09 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; =20 +bool kvm_has_gmem_attributes; + static size_t vcpu_mmap_sz(void); =20 int __open_path_or_exit(const char *path, int flags, const char *enoent_he= lp) @@ -521,6 +523,7 @@ struct kvm_vm *__vm_create(struct vm_shape shape, uint3= 2_t nr_runnable_vcpus, } guest_rng =3D new_guest_random_state(guest_random_seed); sync_global_to_guest(vm, guest_rng); + sync_global_to_guest(vm, kvm_has_gmem_attributes); =20 kvm_arch_vm_post_create(vm, nr_runnable_vcpus); =20 @@ -2365,6 +2368,8 @@ void __attribute((constructor)) kvm_selftest_init(voi= d) guest_random_seed =3D last_guest_seed =3D random(); pr_info("Random seed: 0x%x\n", guest_random_seed); =20 + kvm_has_gmem_attributes =3D kvm_has_cap(KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIB= UTES); + kvm_selftest_arch_init(); } =20 --=20 2.53.0.1018.g2bb0e51243-goog