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AJvYcCVYAcrE+/0DbLU8GjGilegNdHfgBvt265gV/l5fq98yqnfkSkW58nC5b+a5Dw/flDO54LLb47/EOLcCsEs=@vger.kernel.org X-Gm-Message-State: AOJu0YwsDGOjb6izQ3rFdZE02zeDYmouatJyZjYZJQxP2rIuKvLMjY0P UWWB05livMgkHzjxEuds74h9ZViTtV2Snr/q9Cf72WXgRfxG/eiYDx6itLmOrlCLmRfdpNoiAtj wHSdN/B5D5kyRd+wvvXLhl3sJ6A== X-Received: from plau12.prod.google.com ([2002:a17:903:304c:b0:2a0:909e:4227]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:2f87:b0:2a0:c84f:4124 with SMTP id d9443c01a7336-2a8d9a6f717mr139318655ad.52.1770071462970; Mon, 02 Feb 2026 14:31:02 -0800 (PST) Date: Mon, 2 Feb 2026 14:30:03 -0800 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 2.53.0.rc1.225.gd81095ad13-goog Message-ID: <527031abf315ca4c6eb42bd3c6618a884ea90d6c.1770071243.git.ackerleytng@google.com> Subject: [RFC PATCH v2 25/37] KVM: selftests: Test precision of conversion From: Ackerley Tng To: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org Cc: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chao.p.peng@linux.intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, hpa@zytor.com, ira.weiny@intel.com, jgg@nvidia.com, jmattson@google.com, jroedel@suse.de, jthoughton@google.com, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.com, oupton@kernel.org, pankaj.gupta@amd.com, pbonzini@redhat.com, prsampat@amd.com, qperret@google.com, ricarkol@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, seanjc@google.com, shivankg@amd.com, shuah@kernel.org, steven.price@arm.com, tabba@google.com, tglx@linutronix.de, vannapurve@google.com, vbabka@suse.cz, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, Ackerley Tng 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 9dc47316112f..b109f078bc6b 100644 --- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c @@ -227,7 +227,8 @@ 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) { @@ -247,12 +248,20 @@ 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 2.53.0.rc1.225.gd81095ad13-goog