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AJvYcCUV1ePD0NdmcOXUOIgmb8whnnq6I0IC5ChZsEietSONMFvodIzRGNIV8zujI80mxTcFgI32MkDwNbKkKAw=@vger.kernel.org X-Gm-Message-State: AOJu0YznayHxSpKFE7VVNtT82tjavJjowpfV42tfc/bIw4ijxuWuLfe3 pDfWsKptA5s2RgEh3oWpok8Pdj5TZw/47iqPMEhGHKePsoxRBmUV7rxUe72RyZDpSnWX6imGGND h7O0GYkvddFaQLynCRCFKDcxvEg== X-Google-Smtp-Source: AGHT+IFaVh5FLKaAG/q3ccs7S5CZUmyME95ySy5g2wu/pIuJKr9rpIYkO/d4uo4694WlqOqMAyATNgjBKMjQAO8boA== X-Received: from pjbnl2.prod.google.com ([2002:a17:90b:3842:b0:33b:51fe:1a73]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:ec8b:b0:32e:d011:ea0f with SMTP id 98e67ed59e1d1-33bcf8f7280mr5551444a91.25.1760731988400; Fri, 17 Oct 2025 13:13:08 -0700 (PDT) Date: Fri, 17 Oct 2025 13:12:05 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.51.0.858.gf9c4a03a3a-goog Message-ID: <1869a0b8eaf867052c11a04fe1efb1442ba1897d.1760731772.git.ackerleytng@google.com> Subject: [RFC PATCH v1 24/37] KVM: selftests: guest_memfd: Test precision of conversion From: Ackerley Tng To: cgroups@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org Cc: ackerleytng@google.com, akpm@linux-foundation.org, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@redhat.com, dmatlack@google.com, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, haibo1.xu@intel.com, hannes@cmpxchg.org, hch@infradead.org, hpa@zytor.com, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgg@ziepe.ca, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, mhocko@kernel.org, mic@digikod.net, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, peterx@redhat.com, pgonda@google.com, prsampat@amd.com, pvorel@suse.cz, qperret@google.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shakeel.butt@linux.dev, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, tglx@linutronix.de, thomas.lendacky@amd.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, wyihan@google.com, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Enhance the guest_memfd indexing selftest to also verify the precision of memory conversions between private and shared. The existing test converted a single page within a multi-page mapping but did not explicitly check the state of the surrounding pages after the conversion loop. Add checks to confirm that converting a single page from shared to private only affects the target page. Iterate through all other pages in the guest_memfd region to ensure they remain in their original shared state, thus verifying that the conversion operation is precise and does not have unintended side effects. Signed-off-by: Ackerley Tng --- .../selftests/kvm/guest_memfd_conversions_test.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c b/t= ools/testing/selftests/kvm/guest_memfd_conversions_test.c index b42b1b27cb727..43efe4af1403c 100644 --- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c @@ -235,7 +235,8 @@ GMEM_CONVERSION_TEST_INIT_SHARED(init_shared) =20 /* * Test indexing of pages within guest_memfd, using test data that is a mu= ltiple - * of page index. + * of page index. Also test the precision of conversion, that it does not + * affect surrounding pages. */ GMEM_CONVERSION_MULTIPAGE_TEST_INIT_SHARED(indexing, 4) { @@ -255,12 +256,20 @@ GMEM_CONVERSION_MULTIPAGE_TEST_INIT_SHARED(indexing, = 4) test_shared(t, i, i * 2, i * 3, i * 4); } =20 + /* Confirm that only one page was converted */ for (i =3D 0; i < nr_pages; ++i) { if (i =3D=3D test_page) - test_convert_to_shared(t, i, i * 4, i * 5, i * 6); + test_private(t, i, i * 4, i * 6); else test_shared(t, i, i * 4, i * 5, i * 6); } + + for (i =3D 0; i < nr_pages; ++i) { + if (i =3D=3D test_page) + test_convert_to_shared(t, i, i * 6, i * 7, i * 8); + else + test_shared(t, i, i * 6, i * 7, i * 8); + } } =20 /* --=20 2.51.0.858.gf9c4a03a3a-goog