pci-bridge-hongming

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1、Libvirtsupportforpci-bridgehongming2015.5.221Requirement●Bug737723-[FEATRHEL7.0]libvirtsupportforqemu/kvmPCIBridge●QEMUhasonly32pcislots●Withoutpci-bridge,200+muti-functionpcidevices,butarenothot-pluggable●Techpreviewinrhel7.0,hot-pluggingofdevicesbehindthebridgeisnotsupportedinrhel7.02W

2、hatispci●PeripheralComponentInterconnect●PCIdevices●PCIe3Whatispci●PCIaddressinlibvirt●domain:notcurrentlyusedbyqemu●bus:0x0~0xff(0~255)●slot:0x0~0x1f(0~31)●function:0x0~0x7(0~7)●multifunctiondefaultsto'off'4Whatispci●PCImutifunction5Whatispci●PCImutifunction●Theoreticalvalue:256devices(

3、32slots*8functions)●Somedevices(likeUSBcontroller)arerequiredtohavespecialPCIaddress(it'scausedbyqemudesign)6Whatispci●PCIaddressreservedbyqemu7Whatispci●PCIaddressreservedbyqemu8PCIbridge●APCIbridgeisahardwareconnectionbetweentwodifferentbuses.●ThebridgemaybePCItoPCI,PCItoISAorsomeother

4、kindofbus9PCIbridge●supportedmachinetype10PCIbridge●i440fx●PCIbridgesareauto-addediftherearetoomanydevicestofitontheonebusprovidedbypci-root●PCIbridgescanalsobespecifiedmanually●-devicepcibridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x211PCIbridge●q35●pcie-rootprovides31slots(numbered1-31

5、)andcanonlybeusedtoattachPCIedevices●InordertoconnectstandardPCIdevicesonasystemwhichhasapcie-rootcontroller,apcicontrollerwithmodel='dmi-to-pci-bridge'isautomaticallyadded.12PCIbridge●q35●Inordertohavehot-pluggablePCIslotsintheguestsystem,apci-bridgecontrollerwillalsobeautomaticallycrea

6、tedandconnectedtooneoftheslotsoftheauto-createddmi-to-pci-bridgecontroller●allguestdeviceswithPCIaddressesthatareauto-determinedbylibvirtwillbeplacedonthispci-bridgedevice13Supportforpci-bridgehotplug●Testscenarios●Attachdevicestobridgewitchattachedtopci-root●max31devices●Attachdevicesto

7、bridgebehindbridge●max255bridges●Seabios●Recognize9pcibridges●OVFM●Recognize50pcibridges●450pcidevices,rhel7.1guestcanrecognizeallSupportforpci-bridgehotplug●Attachdevicestobridgewitchattachedtopci-root●-devicepci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x3●-devicepci