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AFNElJ+drTo4z5UZoVOn/rA23oZIoRv3VXaZ/eP1WQSkSU2wuHJAxLvr/34PYSn2nX6vGxbkDUSz0PNtKU3B@lists.linux.dev X-Gm-Message-State: AOJu0Yxa22S/Q1vRdHWaqEBAuClxf6SzQ6ybeI+2/Hq43Yd8moty2kif Dgw6fLyiSaRc7y7/JFX42/qdcXHVNMwubc4yJeyK5XzOWhINGYg5+6vHpsZlEy3+V/O0/rGQou6 A3aYs5xOfL4+9mfdiBJmhMTQntw== X-Received: from pfwp18.prod.google.com ([2002:a05:6a00:26d2:b0:82f:61ed:8b2]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:4487:b0:82f:77c9:a89f with SMTP id d2e1a72fcca58-834ddc57adfmr5463785b3a.37.1777419211701; Tue, 28 Apr 2026 16:33:31 -0700 (PDT) Date: Tue, 28 Apr 2026 16:33:22 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260428-gmem-inplace-conversion-v5-0-d8608ccfca22@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: Subject: [POC PATCH 2/6] KVM: selftests: Use guest_memfd memory contents in-place for SNP launch update From: Ackerley Tng To: devnull+ackerleytng.google.com@kernel.org Cc: ackerleytng@google.com, aik@amd.com, akpm@linux-foundation.org, andrew.jones@linux.dev, aneesh.kumar@kernel.org, axelrasmussen@google.com, baohua@kernel.org, bhe@redhat.com, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@linux.intel.com, chrisl@kernel.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, forkloop@google.com, hpa@zytor.com, ira.weiny@intel.com, jgg@ziepe.ca, jmattson@google.com, jthoughton@google.com, kas@kernel.org, kasong@tencent.com, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, michael.roth@amd.com, mingo@redhat.com, nphamcs@gmail.com, oupton@kernel.org, pankaj.gupta@amd.com, pbonzini@redhat.com, pratyush@kernel.org, qi.zheng@linux.dev, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, seanjc@google.com, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, shivankg@amd.com, shuah@kernel.org, skhan@linuxfoundation.org, steven.price@arm.com, suzuki.poulose@arm.com, tabba@google.com, tglx@kernel.org, vannapurve@google.com, vbabka@kernel.org, weixugc@google.com, willy@infradead.org, wyihan@google.com, x86@kernel.org, yan.y.zhao@intel.com, youngjun.park@lge.com, yuanchu@google.com Content-Type: text/plain; charset="UTF-8" Update the SEV-SNP launch update flow to utilize guest_memfd in-place conversion. Include the KVM_SET_MEMORY_ATTRIBUTES2_PRESERVE flag when setting memory attributes to private. This is permitted before the SNP VM is finalized. In snp_launch_update_data, pass 0 as the host virtual address. This instructs the kernel to perform the launch update using the guest_memfd backing the guest physical address rather than a userspace-provided buffer. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/lib/x86/sev.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/x86/sev.c b/tools/testing/selftests/kvm/lib/x86/sev.c index d0205b3299e0b..72b2935871fe4 100644 --- a/tools/testing/selftests/kvm/lib/x86/sev.c +++ b/tools/testing/selftests/kvm/lib/x86/sev.c @@ -32,13 +32,14 @@ static void encrypt_region(struct kvm_vm *vm, struct userspace_mem_region *regio const u64 size = (j - i + 1) * vm->page_size; const u64 offset = (i - lowest_page_in_region) * vm->page_size; - if (private) - vm_mem_set_private(vm, gpa_base + offset, size, 0); + if (private) { + vm_mem_set_private(vm, gpa_base + offset, size, + KVM_SET_MEMORY_ATTRIBUTES2_PRESERVE); + } if (is_sev_snp_vm(vm)) snp_launch_update_data(vm, gpa_base + offset, - (u64)addr_gpa2hva(vm, gpa_base + offset), - size, page_type); + 0, size, page_type); else sev_launch_update_data(vm, gpa_base + offset, size); -- 2.54.0.545.g6539524ca2-goog