** Changed in: linux (Ubuntu Yakkety)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1656381
Title:
Xen MSI setup code incorrectly re-uses cached pirq
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
New
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Yakkety:
Fix Committed
Status in linux source package in Zesty:
In Progress
Bug description:
[Impact]
This bug fixes the root problem reported in bug 1648449, so its
description can be mostly reused here:
On an Amazon AWS instance that has NVMe drives, the NVMe drives fail
to initialize, and so aren't usable by the system. If one of the NVMe
drives contains the root filesystem, the instance won't boot.
[Test Case]
Boot an AWS instance with multiple NVMe drives. All except the first
will fail to initialize, and errors will appear in the system log (if
the system boots at all). With a patched kernel, all NVMe drives are
initialized and enumerated and work properly.
[Regression Potential]
Patching the Xen MSI setup function may cause problems with other PCI
devices using MSI/MSIX interrupts on a Xen guest.
[Other Info]
The patch from bug 1648449 was only a workaround, that changed the
NVMe driver to not trigger this Xen bug. However, there have been
reports of that patch causing non-Xen systems with NVMe drives to stop
working, in bug 1626894. So, the best thing to do is revert the
workaround patch (and its regression fix patch from bug 1651602) back
to the original NVMe drive code, and apply the real Xen patch to fix
the problem. That should restore functionality for non-Xen systems,
and should allow Xen systems with multiple NVMe controllers to work.
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