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https://events.static.linuxfound.org/slides/2010/linuxcon_japan/linuxcon_jp2010_yamahata.pdf
Motivation QEmu is used for device emulator for many virtualization technologies. KVM, Xen... QEmu supports PCI in a limited way, and doesn't support PCI Express. So do QEmu derivatives. Fill those gaps Address them to enable KVM, Xen, ... to utilize those features.
http://www-archive.xenproject.org/files/xensummit_intel09/qemu-pcie.pdf
PCI express features Hot plug, power management, ARI, AER Native pass through of PCI express device to guest OS PCI express devices can be passed through as PCI device, though. Need to fill those gap between newer real hardware features and qemu emulation mainly in PCI related area.
https://www.linux-kvm.org/images/2/2e/2010-forum-Pci-express-in-qemu.pdf
Why PCI Express? New features: enhancements as a successor Used as express is widely accepted in the market. Some device drivers require express They check if the device is really express Existing PCI device assignment isn't enough Hardware certification requires express Current PCI support …
https://www.valinux.co.jp/wp/wp-content/uploads/2018/02/20100428_02.pdf
Apr 28, 2010 · PCI Express native hotplug From qemu monitor command line pci_add/pci_del – Or device_add/device_del – This is same to PCI hot plug. – Internally it calls back bus specific function. So it eventually pci express hotplug logic. pcie_abp [chassis.]slot – push PCI express attention buttion of a given domain and chassis number.
https://wiki.qemu.org/Features/PCIBridgeHotplug
Once implemented, QEMU will be able to support ACPI based hotplug and hotunplug for PCI devices behind PCI bridges. This allows use of more than 32 individually hotpluggable PCI devices. Note: ACPI doesn't support adding or removing bridges themselves by hotplug. After QEMU 1.6
https://wiki.qemu.org/images/f/f6/PCIvsPCIe.pdf
PCI Overview PCI vs PCI Express. 2 Agenda (PCI vs PCIe) ... support for the Quiesce command Firmware Ensure unused IO/MEM regions remain for the use of the new PCI devices PCI Hot Plug Software elements of Standard Hot Plug Usage Model. 40 …
https://tic-le-polard.blogspot.com/2015/01/emulate-pci-device-with-qemu.html
the function pci_irq_assert(pci_dev) will throw an interrupt, so the qemu side of this is easy. Now you need to have a way from the host to use this code.
https://github.com/qemu/qemu/blob/master/docs/pcie.txt
Mar 01, 2018 · The PCI Express spec requires that PCI Express devices work properly: without using IO ports. The PCI hierarchy has no such limitations. 4. Bus numbers issues ===== Each PCI domain can have up to only 256 buses and the QEMU PCI Express: machines do not support multiple PCI domains even if extra Root: Complexes (pxb-pcie) are used.
https://www.linux-kvm.org/page/PCITodo
Support for different PCI express link width/speed settings Issue: QEMU currently emulates all links at minimal width and speed. This means we don't need to emulate link negotiation, but might in theory confuse guests for assigned devices.
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