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a=ed25519-sha256; t=1774563861; l=2836; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=mbmnyh+Paq6B3nFHJjVqfDuPSLNxTEBywi3jrm5yLoM=; b=ayjE20AS++xWp9N9WMziD80Oj2fnaF8+fEzlR1NValnRS6nVfyJUGa/eCX/UeeAKeN4u7/8Jy xLD/R+OSUjsBKl4tO0uelwfjOm2q3N6Bn3lz/wkKJsC7TbYULR2LjZv X-Mailer: b4 0.14.3 Message-ID: <20260326-gmem-inplace-conversion-v4-34-e202fe950ffd@google.com> Subject: [PATCH RFC v4 34/44] KVM: selftests: Support checking that data not equal expected 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 Expand run_guest_do_rmw() to support checking that data at given pgoff is not equal to expected_val. This will be used in a later patch that tests that memory contents are scrambled. Signed-off-by: Ackerley Tng --- .../selftests/kvm/guest_memfd_conversions_test.c | 17 +++++++++++++= ---- 1 file changed, 13 insertions(+), 4 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 c0abc69f15332..277b122ec294c 100644 --- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c @@ -137,6 +137,7 @@ static void __gmem_conversions_multipage_##test(test_da= ta_t *t, int nr_pages, \ struct guest_check_data { void *mem; char expected_val; + bool assert_not_equal; char write_val; }; static struct guest_check_data guest_data; @@ -146,7 +147,13 @@ static void guest_do_rmw(void) for (;;) { char *mem =3D READ_ONCE(guest_data.mem); =20 - GUEST_ASSERT_EQ(READ_ONCE(*mem), READ_ONCE(guest_data.expected_val)); + if (READ_ONCE(guest_data.assert_not_equal)) { + GUEST_ASSERT_NE(READ_ONCE(*mem), + READ_ONCE(guest_data.expected_val)); + } else { + GUEST_ASSERT_EQ(READ_ONCE(*mem), + READ_ONCE(guest_data.expected_val)); + } WRITE_ONCE(*mem, READ_ONCE(guest_data.write_val)); =20 GUEST_SYNC(0); @@ -154,13 +161,15 @@ static void guest_do_rmw(void) } =20 static void run_guest_do_rmw(struct kvm_vcpu *vcpu, loff_t pgoff, - char expected_val, char write_val) + char expected_val, char write_val, + bool assert_not_equal) { struct ucall uc; int r; =20 guest_data.mem =3D (void *)GUEST_MEMFD_SHARING_TEST_GVA + pgoff * page_si= ze; guest_data.expected_val =3D expected_val; + guest_data.assert_not_equal =3D assert_not_equal; guest_data.write_val =3D write_val; sync_global_to_guest(vcpu->vm, guest_data); =20 @@ -191,7 +200,7 @@ static void test_private(test_data_t *t, loff_t pgoff, = char starting_val, char write_val) { TEST_EXPECT_SIGBUS(WRITE_ONCE(t->mem[pgoff * page_size], write_val)); - run_guest_do_rmw(t->vcpu, pgoff, starting_val, write_val); + run_guest_do_rmw(t->vcpu, pgoff, starting_val, write_val, false); TEST_EXPECT_SIGBUS(READ_ONCE(t->mem[pgoff * page_size])); } =20 @@ -207,7 +216,7 @@ static void test_shared(test_data_t *t, loff_t pgoff, c= har starting_val, char host_write_val, char write_val) { host_do_rmw(t->mem, pgoff, starting_val, host_write_val); - run_guest_do_rmw(t->vcpu, pgoff, host_write_val, write_val); + run_guest_do_rmw(t->vcpu, pgoff, host_write_val, write_val, false); TEST_ASSERT_EQ(READ_ONCE(t->mem[pgoff * page_size]), write_val); } =20 --=20 2.53.0.1018.g2bb0e51243-goog