[vfio-manage] load vfio-pci module before binding GPUs to it

[cdesiniotis]

// vfio_pci module is not loaded initially
$ lsmod | grep vfio_pci
vfio_pci_core          69632  0
vfio_virqfd            16384  1 vfio_pci_core
vfio                   45056  2 vfio_pci_core,vfio_iommu_type1
irqbypass              16384  2 vfio_pci_core,kvm

$ sudo ./vfio-manage bind --all
INFO[2025-12-20T00:00:12Z] Binding device 0000:3b:00.0
INFO[2025-12-20T00:00:12Z] Binding device 0000:3b:00.0 to driver: vfio-pci
INFO[2025-12-20T00:00:12Z] Binding device 0000:d8:00.0
INFO[2025-12-20T00:00:12Z] Binding device 0000:d8:00.0 to driver: vfio-pci

$ lsmod | grep vfio_pci
vfio_pci               16384  0
vfio_pci_core          69632  1 vfio_pci
vfio_virqfd            16384  1 vfio_pci_core
vfio                   45056  2 vfio_pci_core,vfio_iommu_type1
irqbypass              16384  2 vfio_pci_core,kvm

$ lspci -nnk -d 10de:
3b:00.0 3D controller [0302]: NVIDIA Corporation GA102GL [A40] [10de:2235] (rev a1)
	Subsystem: NVIDIA Corporation Device [10de:145a]
	Kernel driver in use: vfio-pci
	Kernel modules: nouveau
d8:00.0 3D controller [0302]: NVIDIA Corporation GA102GL [A40] [10de:2235] (rev a1)
	Subsystem: NVIDIA Corporation Device [10de:145a]
	Kernel driver in use: vfio-pci
	Kernel modules: nouveau

[coveralls]

Pull Request Test Coverage Report for Build 20732432159

Details

• 0 of 43 (0.0%) changed or added relevant lines in 4 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.08%) to 6.393%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/linuxutils/kmod.go	0	7	0.0%
cmd/vfio-manage/unbind.go	0	10	0.0%
internal/nvpci/nvpci.go	0	11	0.0%
cmd/vfio-manage/bind.go	0	15	0.0%

Files with Coverage Reduction	New Missed Lines	%
cmd/vfio-manage/bind.go	1	0.0%
cmd/vfio-manage/unbind.go	1	0.0%
internal/linuxutils/kmod.go	1	0.0%

Totals
Change from base Build 20252701997:	-0.08%
Covered Lines:	84
Relevant Lines:	1314

---

💛 - Coveralls

Approved by mistake

[cdesiniotis]

I forgot to remove an unused constant in internal/linuxutils/kmod.go after removing some code. I have removed this constant now. Will merge after the CI passes.