Hi,
I'm a noob to VFIO so hopefully this is not to lame a question.
I'm looking to set up a Linux guest VM with a direct-assigned nvme ssd,
that I can control by a usermode driver with VFIO. I enable nested
virtualization in KVM and set up the iommu parameters on the command line:
Host:
# dmesg | grep Command
[ 0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.7.0_0611+
root=UUID=<blah> ro resume=UUID=<blah> console=tty0 console=ttyS4,115200
intel_iommu=on iommu=pt
# modprobe kvm_intel nested=1
# ls /sys/kernel/iommu_groups
0 1 10 11 12 13 14 15 16 17 18 19 2 3 4 5 6 7 8 9
The direct assignment works and I can see the drive in the guest, but
vfio does not create any iommu groups:
Guest:
# lspci | grep Non
07:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe
SSD Controller SM981/PM981/PM983
# dmesg | grep -i -e DMAR -e IOMMU
[ 0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.7.0
root=/dev/mapper/fedora_localhost--live-root ro
resume=/dev/mapper/fedora_localhost--live-swap
rd.lvm.lv=fedora_localhost-live/root
rd.lvm.lv=fedora_localhost-live/swap intel_iommu=on iommu=pt
[ 0.064051] Kernel command line:
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.7.0
root=/dev/mapper/fedora_localhost--live-root ro
resume=/dev/mapper/fedora_localhost--live-swap
rd.lvm.lv=fedora_localhost-live/root
rd.lvm.lv=fedora_localhost-live/swap intel_iommu=on iommu=pt
[ 0.064102] DMAR: IOMMU enabled
[ 0.383193] iommu: Default domain type: Passthrough (set via kernel
command line)
[ 1.467722] intel_iommu=on
# ls -la /sys/kernel/iommu_groups/
total 0
drwxr-xr-x. 2 root root 0 Jun 15 15:16 .
drwxr-xr-x. 15 root root 0 Jun 15 15:12 ..
#
Clearly I'm missing something in my setup/config, but I'm not sure that
that could be. Can anyone please advise?
TIA,
Ed
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