On Thu, Jul 12, 2018 at 07:33:14AM +0000, Elijah Shakkour wrote: > Hey, > > Our team is adding a NIC functional emulation to QEMU. > One of the features we are adding to this NIC is SRIOV. > > Here is the error message I get when checking SRIOV support of our emulated > NIC on Win2016 server (the hyper-v VM). > " > SR-IOV cannot be used on this system as the PCI Express hardware does not > support Access Control Services (ACS) at any root port. Contact your system > vendor for further information. > "
I'm not sure what the status of emulated SR-IOV is so I have CCed Michael Tsirkin and Marcel Apfelbaum, the PCI maintainers in QEMU. > > Could you please advise about what could be the issue here? > > BTW: I use same configuration (VM XML file attached) when running linux VM > (RH7.2) image (instead of Win Hyper-V) over the same host and SRIOV is > working for me there. > > Here the XML file I use to define the VM (our emulated NIC is added at the > end of XML): > " > <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> > <name>nst105</name> > <uuid>0249a525-2ee2-432b-a1f5-a6db83b089a3</uuid> > <memory unit='KiB'>8388608</memory> > <currentMemory unit='KiB'>8388608</currentMemory> > <vcpu placement='static'>8</vcpu> > <resource> > <partition>/machine</partition> > </resource> > <os> > <type arch='x86_64' machine='pc-q35-2.11'>hvm</type> > </os> > <features> > <acpi/> > <apic/> > <hyperv> > <relaxed state='on'/> > <vapic state='on'/> > <spinlocks state='on' retries='8191'/> > </hyperv> > </features> > <cpu mode='custom' match='exact' check='none'> > <model fallback='forbid'>SandyBridge</model> > <feature policy='require' name='hypervisor'/> > <feature policy='require' name='vmx'/> > </cpu> > <clock offset='localtime'> > <timer name='rtc' tickpolicy='catchup'/> > <timer name='pit' tickpolicy='delay'/> > <timer name='hpet' present='no'/> > <timer name='hypervclock' present='yes'/> > </clock> > <on_poweroff>destroy</on_poweroff> > <on_reboot>restart</on_reboot> > <on_crash>destroy</on_crash> > <pm> > <suspend-to-mem enabled='no'/> > <suspend-to-disk enabled='no'/> > </pm> > <devices> > <emulator>/opt/qemu/bin/qemu-system-x86_64</emulator> > <disk type='file' device='disk'> > <driver name='qemu' type='qcow2'/> > <source file='/images/nst105.qcow2'/> > <target dev='sda' bus='sata'/> > <boot order='2'/> > <address type='drive' controller='0' bus='0' target='0' unit='0'/> > </disk> > <controller type='usb' index='0' model='ich9-ehci1'> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' > function='0x7'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci1'> > <master startport='0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' > function='0x0' multifunction='on'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci2'> > <master startport='2'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' > function='0x1'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci3'> > <master startport='4'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' > function='0x2'/> > </controller> > <controller type='sata' index='0'> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' > function='0x2'/> > </controller> > <controller type='pci' index='0' model='pcie-root'/> > <controller type='pci' index='1' model='pcie-root-port'> > <model name='pcie-root-port'/> > <target chassis='1' port='0x10'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' > function='0x0' multifunction='on'/> > </controller> > <controller type='pci' index='2' model='pcie-root-port'> > <model name='pcie-root-port'/> > <target chassis='2' port='0x11'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' > function='0x1'/> > </controller> > <controller type='pci' index='3' model='pcie-root-port'> > <model name='pcie-root-port'/> > <target chassis='3' port='0x12'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' > function='0x2'/> > </controller> > <controller type='pci' index='4' model='dmi-to-pci-bridge'> > <model name='i82801b11-bridge'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x1e' > function='0x0'/> > </controller> > <controller type='pci' index='5' model='pci-bridge'> > <model name='pci-bridge'/> > <target chassisNr='5'/> > <address type='pci' domain='0x0000' bus='0x04' slot='0x00' > function='0x0'/> > </controller> > <interface type='bridge'> > <mac address='00:50:56:1b:dd:6f'/> > <source bridge='br0'/> > <model type='virtio'/> > <boot order='1'/> > <address type='pci' domain='0x0000' bus='0x01' slot='0x00' > function='0x0'/> > </interface> > <serial type='pty'> > <target port='0'/> > </serial> > <console type='pty'> > <target type='serial' port='0'/> > </console> > <input type='tablet' bus='usb'> > <address type='usb' bus='0' port='1'/> > </input> > <input type='mouse' bus='ps2'/> > <input type='keyboard' bus='ps2'/> > <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1' > keymap='en-us'> > <listen type='address' address='127.0.0.1'/> > </graphics> > <video> > <model type='vga' vram='16384' heads='1' primary='yes'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x01' > function='0x0'/> > </video> > <memballoon model='virtio'> > <address type='pci' domain='0x0000' bus='0x02' slot='0x00' > function='0x0'/> > </memballoon> > </devices> > <seclabel type='none' model='none'/> > <seclabel type='dynamic' model='dac' relabel='yes'/> > <qemu:commandline> > <qemu:arg value='-device'/> > <qemu:arg > value='pcie-root-port,pref64-reserve=500M,slot=0,id=pcie_port.1'/> > <qemu:arg value='-netdev'/> > <qemu:arg value='tap,id=tap5,ifname=tap5,script=no,downscript=no'/> > <qemu:arg value='-device'/> > <qemu:arg value='my_emu_nic,netdev=tap5,bus=pcie_port.1'/> > </qemu:commandline> > </domain> > " > ______________________ > General info: > Host OS: RH7.0 (Kernel: 4.14.13) > QEMU version: 2.11 > libvirt version: 3.2.0 > Running the following on the host shows that both nested and IOMMU are > enabled: > ~]#: cat /sys/module/kvm_intel/parameters/nested > Y > ~]# dmesg | grep -e DMAR -e IOMMU > [ 0.000000] DMAR: IOMMU enabled > > Thanks, > Elijah >
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