id = 2513
title = "CXL Device Missing PCI_CAP_ID_PM (01h) in CAP List Implementation According to PCIe SPEC"
state = "opened"
created_at = "2024-08-18T05:12:55.150Z"
closed_at = "n/a"
labels = ["device: PCI"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2513"
host-os = "Rocky Linux 8.10 (Green Obsidian)"
host-arch = "x86_64"
qemu-version = "QEMU emulator version 9.0.2 (v9.0.2)"
guest-os = "Ubuntu 22.04.3 LTS"
guest-arch = "x86_64"
description = """- The lack of **PCI_CAP_ID_PM (01h)** will not cause any crash or error when running QEMU, but it is violated to the PCIe SPEC.
- When some vendors test the power management capability (e.g., Linux Runtime PM), they must manually implement this CAP list to support the D1/D2/D3_Hot d-states changes.
- We don't see any PCI_CAP_ID_PM (01h) in the CXL rootport or endpoint

    ![image](/uploads/ba5f2de689eb1059b2b82ab072f1bf7b/image.png){width=349 height=474}


#"""
reproduce = """1. Run the qemu-system-x86 (See QEMU command line)
2. sudo lspci -xxx"""
additional = "n/a"