{"id":2230528,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230528/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429135717.3048713-8-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":"<20260429135717.3048713-8-joshualant@gmail.com>","date":"2026-04-29T13:48:41","name":"[RFC,QEMU,07/10] cxl-downstream-port: Add support for VCS switching","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5b613c1789f0d005d0b3cf46289ce2ac5065faea","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/20260429135717.3048713-8-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/2230528/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230528/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=jsKAgWbl;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-wm1-x335.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 16:03:16 -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":"When a downstream port is connnected to an upstream port which is\ndefined as a VCS within a cxl-vcs-switch, the port will automatically be\ninstantiated as a VPPB within that VCS. This downstream port will then\nappear normally to the guest, but can be connected to a real downstream\nPPB at runtime when the switch is issued a bind command by the Fabric\nManager.\n\nSigned-off-by: Joshua Lant \n---\n hw/pci-bridge/cxl_downstream.c | 11 +++++++++++\n 1 file changed, 11 insertions(+)","diff":"diff --git a/hw/pci-bridge/cxl_downstream.c b/hw/pci-bridge/cxl_downstream.c\nindex 5322c46900..5e7ce6410d 100644\n--- a/hw/pci-bridge/cxl_downstream.c\n+++ b/hw/pci-bridge/cxl_downstream.c\n@@ -14,11 +14,14 @@\n #include \"hw/pci/pcie.h\"\n #include \"hw/pci/pcie_port.h\"\n #include \"hw/pci-bridge/cxl_downstream_port.h\"\n+#include \"hw/pci-bridge/cxl_upstream_port.h\"\n #include \"hw/qdev-properties.h\"\n #include \"hw/qdev-properties-system.h\"\n #include \"hw/cxl/cxl.h\"\n #include \"hw/cxl/cxl_port.h\"\n #include \"qapi/error.h\"\n+#include \"hw/cxl/cxl_vcs_switch.h\"\n+\n \n typedef struct CXLDownstreamPort {\n /*< private >*/\n@@ -199,6 +202,14 @@ static void cxl_dsp_realize(PCIDevice *d, Error **errp)\n PCI_BASE_ADDRESS_MEM_TYPE_64,\n component_bar);\n \n+ PCIDevice *parent = pci_bridge_get_device(pci_get_bus(PCI_DEVICE(d)));\n+ if (parent && object_dynamic_cast(OBJECT(parent), TYPE_CXL_USP)) {\n+ CXLUpstreamPort *usp = CXL_USP(parent);\n+ if (usp->vcs_name) {\n+ cxl_vcs_register_vppb(usp->swcci.vcs, usp, dsp, errp);\n+ }\n+ }\n+\n return;\n \n err_chassis:\n","prefixes":["RFC","QEMU","07/10"]}