Rewrite vfio-manager script in go

[cdesiniotis]

This PR rewrites the vfio-manage script in Go. This sets the stage for a follow-up #128 which adds support for variant VFIO modules besides vfio-pci.

Testing

I acquired a machine that has one L40 and one L4. I configured the L40 GPU into graphics mode using https://developer.nvidia.com/displaymodeselector. Below is the initial state of the system. Notice that the L40 has an auxiliary PCI device.

# lspci -nnk -d 10de:
17:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD102GL [L40] [10de:26b5] (rev a1)
	Subsystem: NVIDIA Corporation AD102GL [L40] [10de:169d]
	Kernel modules: nvidiafb, nouveau
17:00.1 Audio device [0403]: NVIDIA Corporation AD102 High Definition Audio Controller [10de:22ba] (rev a1)
	Subsystem: NVIDIA Corporation AD102 High Definition Audio Controller [10de:169d]
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
3d:00.0 3D controller [0302]: NVIDIA Corporation AD104GL [L4] [10de:27b8] (rev a1)
	Subsystem: NVIDIA Corporation AD104GL [L4] [10de:16ca]
	Kernel modules: nvidiafb, nouveau

Bind

# ./vfio-manage bind --all
INFO[2025-11-20T00:10:12Z] Binding device 0000:17:00.0
INFO[2025-11-20T00:10:12Z] Binding device 0000:3d:00.0

#  lspci -nnk -d 10de:
17:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD102GL [L40] [10de:26b5] (rev a1)
	Subsystem: NVIDIA Corporation AD102GL [L40] [10de:169d]
	Kernel driver in use: vfio-pci
	Kernel modules: nvidiafb, nouveau
17:00.1 Audio device [0403]: NVIDIA Corporation AD102 High Definition Audio Controller [10de:22ba] (rev a1)
	Subsystem: NVIDIA Corporation AD102 High Definition Audio Controller [10de:169d]
	Kernel driver in use: vfio-pci
	Kernel modules: snd_hda_intel
3d:00.0 3D controller [0302]: NVIDIA Corporation AD104GL [L4] [10de:27b8] (rev a1)
	Subsystem: NVIDIA Corporation AD104GL [L4] [10de:16ca]
	Kernel driver in use: vfio-pci
	Kernel modules: nvidiafb, nouveau

Unbind

# ./vfio-manage unbind --all
INFO[2025-11-20T00:28:47Z] Unbinding device 0000:17:00.0
INFO[2025-11-20T00:28:47Z] Unbinding device 0000:3d:00.0

root@smc741ge-0014:/localhome/local-cdesiniotis# lspci -nnk -d 10de:
17:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD102GL [L40] [10de:26b5] (rev a1)
	Subsystem: NVIDIA Corporation AD102GL [L40] [10de:169d]
	Kernel modules: nvidiafb, nouveau
17:00.1 Audio device [0403]: NVIDIA Corporation AD102 High Definition Audio Controller [10de:22ba] (rev a1)
	Subsystem: NVIDIA Corporation AD102 High Definition Audio Controller [10de:169d]
	Kernel modules: snd_hda_intel
3d:00.0 3D controller [0302]: NVIDIA Corporation AD104GL [L4] [10de:27b8] (rev a1)
	Subsystem: NVIDIA Corporation AD104GL [L4] [10de:16ca]
	Kernel modules: nvidiafb, nouveau

[coveralls]

Pull Request Test Coverage Report for Build 19586910222

Details

• 0 of 263 (0.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/vfio-manage/main.go	0	19	0.0%
cmd/vfio-manage/bind.go	0	62	0.0%
cmd/vfio-manage/unbind.go	0	62	0.0%
internal/nvpci/nvpci.go	0	120	0.0%

Totals
Change from base Build 19564974858:	0.0%
Covered Lines:	0
Relevant Lines:	1111

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💛 - Coveralls

[karthikvetrivel]

LGTM. Thanks for your effort on this, Chris.

[cdesiniotis]

@tariq1890 @karthikvetrivel thanks for the reviews and approvals. I just updated this PR since I noticed I did not add the license / copyright header to the internal/nvcpi/nvpci.go file. As this is the only change made since your approval, will proceed to merge.