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0702f48ef4
Previously libvirt would only add pci-bridge devices automatically when an address was requested for a device that required a legacy PCI slot and none was available. This patch expands that support to dmi-to-pci-bridge (which is needed in order to add a pci-bridge on a machine with a pcie-root), and pcie-root-port (which is needed to add a hotpluggable PCIe device). It does *not* automatically add pcie-switch-upstream-ports or pcie-switch-downstream-ports (and currently there are no plans for that). Given the existing code to auto-add pci-bridge devices, automatically adding pcie-root-ports is fairly straightforward. The dmi-to-pci-bridge support is a bit tricky though, for a few reasons: 1) Although the only reason to add a dmi-to-pci-bridge is so that there is a reasonable place to plug in a pci-bridge controller, most of the time it's not the presence of a pci-bridge *in the config* that triggers the requirement to add a dmi-to-pci-bridge. Rather, it is the presence of a legacy-PCI device in the config, which triggers auto-add of a pci-bridge, which triggers auto-add of a dmi-to-pci-bridge (this is handled in virDomainPCIAddressSetGrow() - if there's a request to add a pci-bridge we'll check if there is a suitable bus to plug it into; if not, we first add a dmi-to-pci-bridge). 2) Once there is already a single dmi-to-pci-bridge on the system, there won't be a need for any more, even if it's full, as long as there is a pci-bridge with an open slot - you can also plug pci-bridges into existing pci-bridges. So we have to make sure we don't add a dmi-to-pci-bridge unless there aren't any dmi-to-pci-bridges *or* any pci-bridges. 3) Although it is strongly discouraged, it is legal for a pci-bridge to be directly plugged into pcie-root, and we don't want to auto-add a dmi-to-pci-bridge if there is already a pci-bridge that's been forced directly into pcie-root. Although libvirt will now automatically create a dmi-to-pci-bridge when it's needed, the code still remains for now that forces a dmi-to-pci-bridge on all domains with pcie-root (in qemuDomainDefAddDefaultDevices()). That will be removed in a future patch. For now, the pcie-root-ports are added one to a slot, which is a bit wasteful and means it will fail after 31 total PCIe devices (30 if there are also some PCI devices), but helps keep the changeset down for this patch. A future patch will have 8 pcie-root-ports sharing the functions on a single slot.
52 lines
1.6 KiB
XML
52 lines
1.6 KiB
XML
<domain type='qemu'>
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<name>q35-test</name>
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<uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
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<memory unit='KiB'>2097152</memory>
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<currentMemory unit='KiB'>2097152</currentMemory>
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<vcpu placement='static' cpuset='0-1'>2</vcpu>
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<os>
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<type arch='x86_64' machine='q35'>hvm</type>
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<boot dev='hd'/>
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</os>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<emulator>/usr/libexec/qemu-kvm</emulator>
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<controller type='virtio-serial'/>
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<controller type='scsi' model='virtio-scsi'/>
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<controller type='usb' model='nec-xhci'/>
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<disk type='block' device='disk'>
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<source dev='/dev/HostVG/QEMUGuest1'/>
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<target dev='vdb' bus='virtio'/>
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</disk>
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<filesystem type='mount'>
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<source dir='/export/to/guest'/>
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<target dir='/import/from/host'/>
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</filesystem>
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<video>
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<model type='virtio'/>
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</video>
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<interface type='user'>
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<mac address='00:11:22:33:44:55'/>
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<model type='virtio'/>
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</interface>
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<interface type='user'>
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<mac address='00:11:22:33:44:66'/>
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<model type='e1000e'/>
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</interface>
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<memballoon model='virtio'/>
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<rng model='virtio'>
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<rate bytes='123' period='1234'/>
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<backend model='random'>/dev/urandom</backend>
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</rng>
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<input type='passthrough' bus='virtio'>
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<source evdev='/dev/input/event1234'/>
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</input>
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<input type='mouse' bus='virtio'/>
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<input type='keyboard' bus='virtio'/>
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<input type='tablet' bus='virtio'/>
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</devices>
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</domain>
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