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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260428-gmem-inplace-conversion-v5-44-d8608ccfca22@google.com> References: <20260428-gmem-inplace-conversion-v5-0-d8608ccfca22@google.com> In-Reply-To: <20260428-gmem-inplace-conversion-v5-0-d8608ccfca22@google.com> 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, 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 , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , 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, linux-coco@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777418714; l=2091; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=Avy1yjuj5TLXjW+gFYQvsB+PRbonfW+tVbhN8u3NZik=; b=fb9rZViAfwmrwJD9SGoXVoob6TT9WaSRJ4Wrr/TWhXnHc57g7FFxpcP7viuqXx3r+qwjvVnmr KXKhGbWj4CZCYiavrYR0ULbUfm3YqEoUTcfGzy/jE7G4hkJglBe7CP0 X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com X-Stat-Signature: uhztq3qscee3djuoaberjakjhc7onnma X-Rspamd-Queue-Id: C8CE940003 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1777418741-66920 X-HE-Meta: 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 SeTwqnpA g7/ZOVufpY+nfN6EdvTv9Mr8s4PUjsjFBznD6YCJ9TGwGYaCydat1uAadGOeV0L6ZAas2N2SR+sksixo5Q3xjSjpbR4WKVOV2SKRuIjwte9k6xCQpO5hq2wZLR53S/v7Rc6O/1iNbM7IB/5wyH1pD4QazBR37l+zHvTEAs992mRcDdWmo2mtsmFnMulePPcD4Z94/t4/xfQXcphAsoe7/vy86dHaOQXE5pNbPzZWgGX3CMiaoLYGN3z6qnegATPQyOL0Kxc31KXJb3zs+4/qv6Rr+aSyummd13UdhjljzzbaQycnL4fwyMA7rY8587QMa5Kv8N8zi5f0WqOOqRvMKO509bmWtu33TydAZJLEuUL+zf04ikmPmWJZMG0qqGqxfvWAlOEpVkP1rnWJK7FYoQMP6ZHICIqdi3W/s Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ackerley Tng When using KVM_SET_MEMORY_ATTRIBUTES2, not specifying flags for the ioctl implies no guarantees on memory contents. For KVM_X86_SW_PROTECTED_VM, this mode is implemented by scrambling contents of converted memory ranges. Add a test to check that the unspecified conversion mode was handled in KVM by checking the expected behavior, that existing memory contents are scrambled. Signed-off-by: Ackerley Tng --- .../kvm/x86/guest_memfd_conversions_test.c | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c b/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c index 57adb6d84a053..f4705dc700879 100644 --- a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c @@ -512,6 +512,34 @@ GMEM_CONVERSION_TEST_INIT_SHARED(convert_to_private_does_not_support_zero) TEST_ASSERT_EQ(error_offset, start_offset); } +GMEM_CONVERSION_TEST_INIT_SHARED(convert_mode_unspecified_scrambles) +{ + loff_t error_offset = 0; + int ret; + + test_shared(t, 0, 0, 'A', 'B'); + ret = __gmem_set_private(t->gmem_fd, 0, nr_pages * page_size, + &error_offset, 0); + TEST_ASSERT_EQ(ret, 0); + TEST_ASSERT_EQ(error_offset, 0); + + /* + * Since the content mode 0 scrambles data in memory, there is + * a small chance that this test will falsely fail when the + * scrambled value matches the initial value. + */ + run_guest_do_rmw(t->vcpu, 0, 'B', 'C', true); + + ret = __gmem_set_shared(t->gmem_fd, 0, nr_pages * page_size, + &error_offset, 0); + TEST_ASSERT_EQ(ret, 0); + TEST_ASSERT_EQ(error_offset, 0); + + /* Same small chance of falsely failing test applies here. */ + TEST_ASSERT(READ_ONCE(t->mem[0]) != 'C', + "Conversion without specifying mode should scramble memory."); +} + int main(int argc, char *argv[]) { TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)); -- 2.54.0.545.g6539524ca2-goog