[{"id":3673834,"web_url":"http://patchwork.ozlabs.org/comment/3673834/","msgid":"","list_archive_url":null,"date":"2026-04-06T17:33:33","subject":"Re: [PATCH v2 0/1] contrib/plugins: add syscall-filter passthrough\n zlib demo","submitter":{"id":85798,"url":"http://patchwork.ozlabs.org/api/people/85798/","name":"Pierrick Bouvier","email":"pierrick.bouvier@linaro.org"},"content":"Hi Kailiang,\n\nOn 4/6/26 8:32 AM, XU Kailiang wrote:\n> Hi,\n> \n> This v2 simplifies the earlier series into one minimal, runnable example for\n> the linux-user syscall filter API.\n> \n> It adds:\n> \n> - one plugin: contrib/plugins/passthrough.c\n> - one matching in-tree example: contrib/plugins/passthrough-examples/ (zlib)\n> \n> The plugin handles a small passthrough protocol over a magic syscall\n> (load HTL module, resolve HTL symbol, invoke HTL entry). The zlib guest thunk\n> library (GTL) uses this protocol to forward selected zlib calls to host-side\n> HTL/native zlib.\n> \n> Compared to v1 [1], this version narrows scope:\n> \n> - drop the callback/qsort prototype\n> - drop extra demo variants\n> - keep only a single plugin + single matching example that is easy to build\n> and reproduce\n> \n> Build/repro documentation is provided in:\n> \n> - docs/about/emulation.rst\n> - contrib/plugins/passthrough-examples/README.rst\n> \n> Thanks,\n> XU Kailiang\n> \n> [1]: https://lore.kernel.org/qemu-devel/20260331173656.35305-1-xukl2019@sjtu.edu.cn/T/#t\n> \n> ---\n> \n> XU Kailiang (1):\n> contrib/plugins: add syscall-filter passthrough zlib demo\n> \n> contrib/plugins/meson.build | 11 ++\n> contrib/plugins/passthrough-examples/Makefile | 23 +++\n> .../plugins/passthrough-examples/README.rst | 60 +++++++\n> .../plugins/passthrough-examples/meson.build | 19 ++\n> .../passthrough-examples/passthrough-gtl.c | 41 +++++\n> .../passthrough-examples/passthrough-gtl.h | 17 ++\n> .../plugins/passthrough-examples/zlib-demo.c | 90 ++++++++++\n> .../plugins/passthrough-examples/zlib-gtl.c | 72 ++++++++\n> .../plugins/passthrough-examples/zlib-htl.c | 37 ++++\n> contrib/plugins/passthrough-protocol.h | 14 ++\n> contrib/plugins/passthrough.c | 162 ++++++++++++++++++\n> docs/about/emulation.rst | 33 ++++\n> 12 files changed, 579 insertions(+)\n> create mode 100644 contrib/plugins/passthrough-examples/Makefile\n> create mode 100644 contrib/plugins/passthrough-examples/README.rst\n> create mode 100644 contrib/plugins/passthrough-examples/meson.build\n> create mode 100644 contrib/plugins/passthrough-examples/passthrough-gtl.c\n> create mode 100644 contrib/plugins/passthrough-examples/passthrough-gtl.h\n> create mode 100644 contrib/plugins/passthrough-examples/zlib-demo.c\n> create mode 100644 contrib/plugins/passthrough-examples/zlib-gtl.c\n> create mode 100644 contrib/plugins/passthrough-examples/zlib-htl.c\n> create mode 100644 contrib/plugins/passthrough-protocol.h\n> create mode 100644 contrib/plugins/passthrough.c\n> \n> \n> base-commit: b6a7d06213e5d2f7d124d16418bc289c4a8a4b82\n\nthanks for posting it.\n\nIt seems there has been a confusion with what we talked about \npreviously, and I'm sorry about that.\n\nWhen mentioning a minimal example, what I had in mind was the Lorelei \nplugin with a minimal example using it. The goal was *not* to show how \nLorelei internals work (thunk libraries, etc), but how to use Lorelei \nitself.\n\n From our follow-up conversation on Discord, I understand that Lorelei \nis still in heavy development, so it might be a bit early to integrate \nthis in QEMU. I understand also there might be other changes required on \nlinux-user side for some specific applications. We would be happy to \nreview those, if we can have an upstream plugin justifying this.\n\nThus, I would invite you to keep on working on Lorelei until you have a \nstable plugin covering all use cases, and see to upstream it if you need \nother changes on linux-user side. Else, I think it can stay downstream \nwith Lorelei libraries also.\n\nKeep us informed of the progress on Lorelei :)!\n\nCheers,\nPierrick","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=jp4fSHAk;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fqGfM3nfFz1yFt\n\tfor ; Tue, 07 Apr 2026 03:34:18 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1w9npW-0008Ek-Tt; 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