[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
[Expired for QEMU because there has been no activity for 60 days.] ** Changed in: qemu Status: Incomplete => Expired -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Expired Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
After increasing dma_entry_limit limit no issue observed. But ideal senario device is getting hung and recovery happening only with host hard rebooting. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Incomplete Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
Presumably w-bits (aw-bits?) implies using intel-iommu, there's a opportunity for the vfio iommu backend to return -ENOSPC (-28) if we exceed the default number of in-flight DMA mappings per container. The default limit is 65535. You can try increasing this by changing the dma_entry_limit module option on the vfio_iommu_type1 module. Note that in a typical vIOMMU config there's a container per device, so the number of VFs attached is possibly not a factor. It is however a lot of DMA mappings for a single device if this is the issue and you'd generally want to boot the guest with iommu=pt in order to have reasonable assigned device performance with a vIOMMU, which would also greatly reduce the number of mappings. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Incomplete Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
qemu-system-x86_64 -name guest=fedora24 -machine q35,accel=kvm,kernel-irqchip=split \ -enable-kvm \ -m 4G \ -smp 8,sockets=1,cores=8,threads=1 \ -device intel-iommu,intremap=on,caching-mode=on,aw-bits=48 \ -drive file=,format=raw \ -device ioh3420,id=pcie.1,chassis=1 \ -device virtio-net-pci,bus=pcie.1,disable-legacy=on,disable-modern=off,iommu_platform=on,ats=on,netdev=net0 \ -netdev user,id=net0,hostfwd=tcp::-:22\ -device vfio-pci,host=3f:02.1 \ -device vfio-pci,host=3f:02.2 \ -device vfio-pci,host=3f:02.3 \ -device vfio-pci,host=3f:02.4 \ -device vfio-pci,host=3d:02.4 \ -device vfio-pci,host=3d:02.5 \ -device vfio-pci,host=3d:02.6 \ -nographic -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Incomplete Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
Please find the above qemu command to lunch guest machine -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Incomplete Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine
Please provide information how you started QEMU, and some information about your PCI device (e.g. the output of lspci). ** Information type changed from Private Security to Public ** Changed in: qemu Status: New => Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1851664 Title: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine Status in QEMU: Incomplete Bug description: We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator. We are observing "VFIO_MAP_DMA : -28" error. We are using w-bits=48 bits while lunching VM. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1851664/+subscriptions
