{"id":2230515,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230515/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429135717.3048713-7-joshualant@gmail.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260429135717.3048713-7-joshualant@gmail.com>","date":"2026-04-29T13:48:40","name":"[RFC,QEMU,06/10] cxl-upstream-port: Add support for targeting a VCS switch","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"cd91c98054df2cf0e0f0083b93e0b2f84afb488d","submitter":{"id":93283,"url":"http://patchwork.ozlabs.org/api/1.1/people/93283/?format=json","name":"Joshua Lant","email":"joshualant@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429135717.3048713-7-joshualant@gmail.com/mbox/","series":[{"id":502144,"url":"http://patchwork.ozlabs.org/api/1.1/series/502144/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502144","date":"2026-04-29T13:48:40","name":"Initial Support for VCS Switching","version":1,"mbox":"http://patchwork.ozlabs.org/series/502144/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230515/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230515/checks/","tags":{},"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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=gbj3zRB4;\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=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.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 4g5Stc3dG9z1yKJ\n\tfor ; Thu, 30 Apr 2026 06:04:06 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wIB7w-0003XH-Vg; Wed, 29 Apr 2026 16:03:21 -0400","from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1wI5QX-0008KG-DO\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 09:58:12 -0400","from mail-wr1-x433.google.com ([2a00:1450:4864:20::433])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from )\n id 1wI5QT-0007iG-3e\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 09:58:08 -0400","by mail-wr1-x433.google.com with SMTP id\n ffacd0b85a97d-441209fb77eso584483f8f.1\n for ; Wed, 29 Apr 2026 06:58:04 -0700 (PDT)","from node1.manccluster.local (revolution.cs.man.ac.uk.\n [130.88.198.135]) by smtp.gmail.com with ESMTPSA id\n ffacd0b85a97d-447b3d48517sm5205950f8f.5.2026.04.29.06.58.02\n (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n Wed, 29 Apr 2026 06:58:02 -0700 (PDT)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=gmail.com; s=20251104; t=1777471083; x=1778075883; darn=nongnu.org;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:from:to:cc:subject:date\n :message-id:reply-to;\n bh=gfj+OEin87giEu8kZpIKXoKArfkMj1N2Z6jKqDhBiuE=;\n b=gbj3zRB4KWrjceG1CsmwwOK66pctwjHIAvR2BEVhkPPO74yzhsZ82uvCEhI1C203Ix\n AzbrX++Zj1XqzkGJG6qlf0+H9aKeA9uKkOR4ARPNnrZvybO3RPd1ATQ/2lq4hkxLdhTl\n eOIHydu/4Ia9l+Lg2hxqZlsjUP7gDvIvNrV3f+lzjVDBiQvqD6iurvS4X9IjY0eG01ew\n 5ltvAQtjm+21j5uiG1aT298CHI7luRiuNhV2/G0xgVzSWNOZpEzr2zEZpthfzpPA3r0P\n xwhVYbMR77Sm2wlMFGk5fgsDHT3RLq4f08EpNHpnVGGe42iWBvBTSjyMNJ3gO+S3Zsm5\n LntQ==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=1e100.net; s=20251104; t=1777471083; x=1778075883;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from\n :to:cc:subject:date:message-id:reply-to;\n bh=gfj+OEin87giEu8kZpIKXoKArfkMj1N2Z6jKqDhBiuE=;\n b=XgU6dWFTikbm4mXrmulytdOVt2M0CxQfo6g1qsDQXDdL2sYGeUGegzJqhCmorMmBDg\n iWltddScB21zpUXLSY7uXLXLPrekys2Bl/OjUbWrxQITCV088QtVAWl0SWQ9AFvtPAAH\n 57qa2Lwjq4m7H2HSTzFBKHBT4Lx5Ca+2iIOf3bW2cI6uT7zJxZjWt23XnJqBcQcFKRuL\n vbibuoyZSL4aX5oqLu90EKJLvIdlwnSTp264aR4EYkM5Nm/5IsE3/yCRCgBJZrmBtytg\n la7eK4U04tt7JVYDkd2uWRk4OWR940bXOTh8SX22jNNReJYKuO7VHr6S1AjBKTeHbA4h\n g+5w==","X-Gm-Message-State":"AOJu0YzT1OtQHOhE266a6IXvoHyUaBcNO9ueLlrbvYkOBWwcuxlAvob6\n aou6LI28Mv8wKfCJHNhq3Arbc7sWC2SZVm+ScE8UEUCozmixzqOOJOmQ","X-Gm-Gg":"AeBDieusOcHUeSNiJ7O1KeKsxK0tzudieQdKFMwj+p1MmkBikDedYFG5NPcvIAs92P1\n jlrFaMXKcKreth5mEbh1tt99tXnv0OGHEQugFgw/WWPkgY3yk1/QxeXJ2KjI1sEKw0dyz+TmSMr\n eW/wURMnULAoS3jpoE9UaPMgUnsgCjre1QY1MBmBcXM+XVjfdPnEHVYkGB70D/pO57d6vAZmOk2\n ojrnqgyNE52a63y8NWfmbvj2MuaKTIo7zMw4EiFAyOarIxUy2K/vuRaf/C6ziPbHb4mPZsm853Q\n 57lsRsQX2HVScGlD/56uj16cBW68haeXaGZ9Mp/un6rj6FblhXiSprFclpRwcStZviMu2U3DN8i\n WJ6YNPgVG5wiPmYrQ6jl4gdkuSUXBMfvv71+jp9kVk2gt0GbJbUKZ1dCzMJNuDtknqrO3NIsqSj\n SKq8s7l3ixRNiaGQlVfA8e0spzFBcQQu1q9MppokQbMFEo+7Is1CRIbPWhf++9V5jJ74fEyK3R","X-Received":"by 2002:a05:6000:2102:b0:445:7f70:70d3 with SMTP id\n ffacd0b85a97d-447a3421972mr4063484f8f.5.1777471083406;\n Wed, 29 Apr 2026 06:58:03 -0700 (PDT)","From":"Joshua Lant ","To":"linux-cxl@vger.kernel.org","Cc":"qemu-devel@nongnu.org, Jonathan.Cameron@huawei.com,\n arpit1.kumar@samsung.com, Joshua Lant ","Subject":"[RFC QEMU PATCH 06/10] cxl-upstream-port: Add support for targeting a\n VCS switch","Date":"Wed, 29 Apr 2026 14:48:40 +0100","Message-ID":"<20260429135717.3048713-7-joshualant@gmail.com>","X-Mailer":"git-send-email 2.47.3","In-Reply-To":"<20260429135717.3048713-1-joshualant@gmail.com>","References":"<20260429135717.3048713-1-joshualant@gmail.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::433;\n envelope-from=joshualant@gmail.com; helo=mail-wr1-x433.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-Mailman-Approved-At":"Wed, 29 Apr 2026 16:03:14 -0400","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Allows an upstream port to be registered on the CLI as a VCS within a\ncxl-vcs-switch. A VCS is defined as an upstream pci-pci bridge, and a set of\ndownstream virtual pci-pci bridges VPPBs, which form a single Virtual\nHierarchy within the switch.\n\nSigned-off-by: Joshua Lant \n---\n hw/pci-bridge/cxl_upstream.c | 20 ++++++++++++++++++++\n include/hw/pci-bridge/cxl_upstream_port.h | 2 ++\n 2 files changed, 22 insertions(+)","diff":"diff --git a/hw/pci-bridge/cxl_upstream.c b/hw/pci-bridge/cxl_upstream.c\nindex 3fcfc2cde6..a91f721c9e 100644\n--- a/hw/pci-bridge/cxl_upstream.c\n+++ b/hw/pci-bridge/cxl_upstream.c\n@@ -16,6 +16,8 @@\n #include \"hw/pci/pcie.h\"\n #include \"hw/pci/pcie_port.h\"\n #include \"hw/pci-bridge/cxl_upstream_port.h\"\n+#include \"hw/cxl/cxl_vcs_switch.h\"\n+\n /*\n * Null value of all Fs suggested by IEEE RA guidelines for use of\n * EU, OUI and CID\n@@ -346,6 +348,22 @@ static void cxl_usp_realize(PCIDevice *d, Error **errp)\n goto err_cap;\n }\n \n+ if (usp->vcs_name && usp->ppb != UINT8_MAX) {\n+ Object *obj = object_resolve_path_component(\n+ object_get_objects_root(), usp->vcs_name);\n+ if (!obj) {\n+ error_setg(errp, \"vcs '%s' not found\", usp->vcs_name);\n+ goto err_cap;\n+ }\n+ if (!object_dynamic_cast(obj, TYPE_CXL_VCS_SWITCH)) {\n+ error_setg(errp, \"'%s' is not a cxl-vcs-switch\", usp->vcs_name);\n+ goto err_cap;\n+ }\n+ cxl_vcs_register_usp(CXL_VCS_SWITCH(obj), usp, errp);\n+ if (*errp) \n+ goto err_cap;\n+ }\n+\n return;\n \n err_cap:\n@@ -372,6 +390,8 @@ static const Property cxl_upstream_props[] = {\n DEFINE_PROP_PCIE_LINK_WIDTH(\"x-width\", CXLUpstreamPort,\n width, PCIE_LINK_WIDTH_16),\n DEFINE_PROP_BOOL(\"x-256b-flit\", CXLUpstreamPort, flitmode, false),\n+ DEFINE_PROP_STRING(\"vcs\", CXLUpstreamPort, vcs_name),\n+ DEFINE_PROP_UINT8(\"usppb\", CXLUpstreamPort, ppb, UINT8_MAX),\n };\n \n static void cxl_upstream_class_init(ObjectClass *oc, const void *data)\ndiff --git a/include/hw/pci-bridge/cxl_upstream_port.h b/include/hw/pci-bridge/cxl_upstream_port.h\nindex ce248f3dca..05632286db 100644\n--- a/include/hw/pci-bridge/cxl_upstream_port.h\n+++ b/include/hw/pci-bridge/cxl_upstream_port.h\n@@ -22,6 +22,8 @@ typedef struct CXLUpstreamPort {\n \n DOECap doe_cdat;\n uint64_t sn;\n+ char *vcs_name;\n+ uint8_t ppb;\n } CXLUpstreamPort;\n \n #endif /* CXL_SUP_H */\n","prefixes":["RFC","QEMU","06/10"]}