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Tsirkin" , Richard Henderson Subject: qemu-system-x86_64 appears to have sgx-epc, but not memory-backend-epc Date: Thu, 22 Oct 2026 14:58:16 +0200 Message-ID: <87zew5j3iv.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 2 X-Spam_score: 0.2 X-Spam_bar: / X-Spam_report: (0.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.339, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 My build of qemu-system-x86_64 has device sgx-epc: --> {"execute": "qom-list-types", "arguments": {"implements": "sgx-epc"}} <-- {"return": [{"name": "sgx-epc", "parent": "device"}]} The device as a link property to a memory-backend-epc: --> {"execute": "qom-list-properties", "arguments": {"typename": "sgx-epc"}} <-- {"return": [... {"name": "memdev", "type": "link"}, ...]} However, type memory-backend-epc does not exist: --> {"execute": "qom-list-types", "arguments": {"implements": "memory-backend"}} <-- {"return": [{"name": "memory-backend-ram", "parent": "memory-backend"}, {"name": "memory-backend-file", "parent": "memory-backend"}, {"name": "memory-backend-memfd", "parent": "memory-backend"}, {"name": "memory-backend-shm", "parent": "memory-backend"}]} The example from docs/system/i386/sgx.rst Launching a guest ----------------- To launch a SGX guest: .. parsed-literal:: |qemu_system_x86| \\ -cpu host,+sgx-provisionkey \\ -object memory-backend-epc,id=mem1,size=64M,prealloc=on \\ -M sgx-epc.0.memdev=mem1,sgx-epc.0.node=0 does not work: qemu-system-x86_64: invalid object type: memory-backend-epc CONFIG_SGX is enabled in my build: $ find bld-x86 -name \*.h -exec grep CONFIG_SGX {} + bld-x86/x86_64-softmmu-config-devices.h:#define CONFIG_SGX 1 bld-x86/config-poison.h:#pragma GCC poison CONFIG_SGX