Re: [libvirt-users] multiple devices in the same iommu group in L1 guest

Hi, I have a guest enabled vIOMMU, but on the guest there are several devices in the same iommu group. Could someone help to check if I missed something?  Thank you very much! 1. guest xml: # virsh edit q ... <os>     <type arch='x86_64' machine='pc-q35-rhel7.5.0'>hvm</type>     <loader readonly='yes' secure='yes' type='pflash'>/usr/share/OVMF/OVMF_CODE.secboot.fd</loader>     <nvram>/var/lib/libvirt/qemu/nvram/q_VARS.fd</nvram>   </os> ...  <features>  ...     <ioapic driver='qemu'/>   </features>  <cpu mode='host-passthrough' check='none'>     <feature policy='require' name='vmx'/>   </cpu> ... <devices> ...  <controller type='pci' index='7' model='pcie-root-port'>       <model name='pcie-root-port'/>       <target chassis='7' port='0x15'/>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>     </controller> <interface type='network'>       <mac address='52:54:00:b9:ff:90'/>       <source network='default'/>       <model type='e1000'/>       <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>     </interface> <iommu model='intel'>       <driver intremap='on' caching_mode='on' iotlb='on'/>     </iommu> </devices> ... 2. guest has 'intel_iommu=on' enabled in kernel cmdline, then reboot guest 3. log in guest to check: # dmesg  | grep -i DMAR [    0.000000] ACPI: DMAR 000000007d83f000 00050 (v01 BOCHS  BXPCDMAR 00000001 BXPC 00000001) [    0.000000] DMAR: IOMMU enabled [    0.155178] DMAR: Host address width 39 [    0.155180] DMAR: DRHD base: 0x000000fed90000 flags: 0x1 [    0.155221] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 12008c22260286 ecap f00f5e [    0.155228] DMAR: ATSR flags: 0x1 [    0.155231] DMAR-IR: IOAPIC id 0 under DRHD base  0xfed90000 IOMMU 0 [    0.155232] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping. [    0.156843] DMAR-IR: Enabled IRQ remapping in x2apic mode [    2.112369] DMAR: No RMRR found [    2.112505] DMAR: dmar0: Using Queued invalidation [    2.112669] DMAR: Setting RMRR: [    2.112671] DMAR: Prepare 0-16MiB unity mapping for LPC [    2.112820] DMAR: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff] [    2.211577] DMAR: Intel(R) Virtualization Technology for Directed I/O ===> This is expected # dmesg  | grep -i iommu  |grep device [    2.212267] iommu: Adding device 0000:00:00.0 to group 0 [    2.212287] iommu: Adding device 0000:00:01.0 to group 1 [    2.212372] iommu: Adding device 0000:00:02.0 to group 2 [    2.212392] iommu: Adding device 0000:00:02.1 to group 2 [    2.212411] iommu: Adding device 0000:00:02.2 to group 2 [    2.212444] iommu: Adding device 0000:00:02.3 to group 2 [    2.212464] iommu: Adding device 0000:00:02.4 to group 2 [    2.212482] iommu: Adding device 0000:00:02.5 to group 2 [    2.212520] iommu: Adding device 0000:00:1d.0 to group 3 [    2.212533] iommu: Adding device 0000:00:1d.1 to group 3 [    2.212541] iommu: Adding device 0000:00:1d.2 to group 3 [    2.212550] iommu: Adding device 0000:00:1d.7 to group 3 [    2.212567] iommu: Adding device 0000:00:1f.0 to group 4 [    2.212576] iommu: Adding device 0000:00:1f.2 to group 4 [    2.212585] iommu: Adding device 0000:00:1f.3 to group 4 [    2.212599] iommu: Adding device 0000:01:00.0 to group 2 [    2.212605] iommu: Adding device 0000:02:01.0 to group 2 [    2.212621] iommu: Adding device 0000:04:00.0 to group 2 [    2.212634] iommu: Adding device 0000:05:00.0 to group 2 [    2.212646] iommu: Adding device 0000:06:00.0 to group 2 [    2.212657] iommu: Adding device 0000:07:00.0 to group 2 ====> several devices in the same iommu group # virsh nodedev-dumpxml pci_0000_07_00_0 <device>   <name>pci_0000_07_00_0</name>   <path>/sys/devices/pci0000:00/0000:00:02.5/0000:07:00.0</path>   <parent>pci_0000_00_02_5</parent>   <driver>     <name>e1000</name>   </driver>   <capability type='pci'>     <domain>0</domain>     <bus>7</bus>     <slot>0</slot>     <function>0</function>     <product id='0x100e'>82540EM Gigabit Ethernet Controller</product>     <vendor id='0x8086'>Intel Corporation</vendor>     <iommuGroup number='2'>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>       <address domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>       <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>       <address domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>       <address domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>       <address domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>       <address domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>       <address domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>     </iommuGroup>

  </capability> </device> Thus, can not attach the device to L2 guest: # cat hostdev.xml <hostdev mode='subsystem' type='pci' managed='yes'>     <source>       <address domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>     </source>   </hostdev> # virsh attach-device rhel hostdev.xml error: Failed to attach device from hostdev.xml error: internal error: unable to execute QEMU command 'device_add': vfio error: 0000:07:00.0: group 2 is not viable ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413 _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users