This bug was fixed in the package linux-kvm - 5.4.0-1040.41
---
linux-kvm (5.4.0-1040.41) focal; urgency=medium
* focal/linux-kvm: 5.4.0-1040.41 -proposed tracker (LP: #1927609)
* Make vfio-pci built-in or xhci_hcd optional (LP: #1770845)
- [Config]: kvm: CONFIG_VFIO=n
*
Given that the main kernel has had this set for over a year, I'm going
to call it good. Setting verification-done-focal for linux-kvm until
proven otherwise. I don't see any interested parties in this bug that
could perform verification anyway. Its been 3 years since the last non-
Canonical
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag
** Changed in: linux-kvm (Ubuntu Focal)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1770845
Title:
Make vfio-pci built-in or xhci_hcd optional
To manage
** Changed in: linux-kvm (Ubuntu Cosmic)
Status: New => Invalid
** Changed in: linux (Ubuntu Cosmic)
Status: Opinion => Invalid
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https://bugs.launchpad.net/bugs/1770845
** Also affects: linux-kvm (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-kvm (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux-kvm (Ubuntu Focal)
Importance: Undecided => Medium
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This bug was fixed in the package linux - 5.4.0-18.22
---
linux (5.4.0-18.22) focal; urgency=medium
* focal/linux: 5.4.0-18.22 -proposed tracker (LP: #1866488)
* Packaging resync (LP: #1786013)
- [Packaging] resync getabis
- [Packaging] update helper scripts
* Add
** Description changed:
+ [Impact]
+ This allows vfio-pci to be bound to certain devices during boot, preventing
other drivers from binding them.
+
+ In particular, USB host drivers, like xhci_hcd, are hard to unbind, as
+ USB devices may end up being used by applications.
+
+ [Test case]
+
I will send a patch making vfio-pci built-in.
** Also affects: linux (Ubuntu Focal)
Importance: Medium
Status: Opinion
** Changed in: linux (Ubuntu Focal)
Status: Opinion => In Progress
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Thadeu Lima de Souza
So according to Arch Wiki
(https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#Isolating_the_GPU):
> Starting with Linux 4.18.16, vfio-pci is compiled-in as opposed to being a
> module
Does this mean the same will happen in Ubuntu's kernel?
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It does, but not working in 100% of cases, for instance when occupied by
USB devices that are actively used by certain applications it was
failing for me occasionally.
The only proper and clean solution is to be able to force the device to
use vfio-pci, which is impossible with the kernel Ubuntu
Doing bind/unbind should work just fine, as reported on that same reddit
discussion. libvirt also takes care of that.
I would rather not change anything here, if those solutions work just
fine.
Cascardo.
** Changed in: linux (Ubuntu Cosmic)
Status: Triaged => Opinion
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Including VFIO in the kernel would be great! This would resolve all
kinds of pass-through crashes.
Currently, the only way to do this is to hope that the USB controller
behaves properly during reclamation by the kernel (most of them do not),
which varies wildly by vendor. In my case, it gets as
What is necessary for this change to happen?
To me it looks like just changing CONFIG_VFIO_PCI=m to CONFIG_VFIO_PCI=y would
be enough and I don't think this may cause any regressions.
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** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Also affects: linux (Ubuntu Cosmic)
Importance: Medium
Status: Triaged
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