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. " 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
