Bug 1655304

Starting with kernel 4.19, i915.ko has:

[root@localhost ~]# modinfo i915 | grep pre\:
softdep:        pre: kvmgt

dracut correctly picks this up, including kvmgt.ko in the initrd (checked with lsinitrd).

But kvmgt.ko has:

[root@localhost ~]# modinfo kvmgt | grep dep
depends:        vfio,mdev,kvm

And dracut does not include any of these kernel modules into the initrd, causing these errors in dmesg:

[    5.395162] kvmgt: Unknown symbol gfn_to_memslot (err -2)
[    5.395184] kvmgt: Unknown symbol vfio_pin_pages (err -2)
[    5.395196] kvmgt: Unknown symbol vfio_info_cap_shift (err -2)
[    5.395208] kvmgt: Unknown symbol vfio_set_irqs_validate_and_prepare (err -2)
[    5.395220] kvmgt: Unknown symbol vfio_device_put (err -2)
[    5.395228] kvmgt: Unknown symbol gfn_to_pfn (err -2)
[    5.395238] kvmgt: Unknown symbol mdev_from_dev (err -2)
[    5.395254] kvmgt: Unknown symbol kvm_put_kvm (err -2)
[    5.395266] kvmgt: Unknown symbol kvm_write_guest (err -2)
etc.

Since this is a softdep this does not really cause much of a problem, but I expect this to actually be an issue if a user actually want to use the hw virt support of their Intel GPU.

It looks to me as if dracut does not include the deps of softdeps ?

Note as a workaround the errors can be silenced by using --omit-drivers kvmgt.