Nvidia proprietary DKMS drivers cannot build in linux-kvm 5.8 and subsequent versions

[Guilherme G. Piccoli]

After an ADT/DKMS modification (see https://bugs.launchpad.net/ubuntu/+source/dkms/+bug/1915051) binary DKMS packages without -dkms in the name started to get tested on ADT run. This exposed a problem in the Nvidia proprietary DKMS modules for linux-kvm build:

if we don't have CONFIG_X86_PAT set, the Nvidia drivers (all versions) set NV_ENABLE_BUILTIN_PAT_SUPPORT to 1 and attempt to build the file nvidia/nv-pat.c - two functions there make use of __flush_tlb() exported symbol.
But, after kernel v5.8, this symbol is not exported anymore [0][1], not even flush_tlb_local() is available.

For the time being, we ADT-hinted linux-kvm package, but the driver requires modifications, in order to fix that.

[0] http://git.kernel.org/linus/2faf153bb734
[1] http://git.kernel.org/linus/bfe3d8f6313d

[Guilherme G. Piccoli (gpiccoli)]

Hints added to linux-kvm, so it should pass the ADT tests.

[Guilherme G. Piccoli (gpiccoli)]

Daniel, just a heads-up: it fails for all Nvidia drivers, hence I marked "nvidia-graphics-drivers" instead of the -460.
Cheers,

Guilherme

[Guilherme G. Piccoli (gpiccoli)]

A more generic LP about ADT failures, that encompass multiple DKMS failures due to lack of Kconfigs set in linux-kvm: https://bugs.launchpad.net/ubuntu/+source/linux-kvm/+bug/1926501 .