** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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Title:
ipmmu is always registered
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This bug was fixed in the package linux - 4.15.0-38.41
---
linux (4.15.0-38.41) bionic; urgency=medium
* linux: 4.15.0-38.41 -proposed tracker (LP: #1797061)
* Silent data corruption in Linux kernel 4.15 (LP: #1796542)
- block: add a lower-level bio_add_page interface
-
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Title:
ipmmu is always registered
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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-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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Title:
ipmmu is always registered
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** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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Title:
ipmmu is always registered
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** Description changed:
+ [Impact]
+
+ The ipmmu-vmsa driver registers itself to the system via an initcall()
+ to ipmmu_init(), and in case it's the first (or the only) iommu driver,
+ it registers its iommu ops to the platform bus - in the tegra2 case,
+ there's no iommu hardware, so all
The patch looks good, but i'll have to wait until it's pulled into Linus
tree.
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Title:
ipmmu is always registered
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Paolo Pisati (p-pisati)
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Title:
ipmmu is always registered
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It is possible that it didn't show up in older kernels (4.4 for X)
because Tegra didn't used the IOMMU at that time.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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It started after upgrade from X to B. This may only show up on Tegra2, which
does not have an IOMMU, and which creates problems if one is registered. Sorry,
I don't understand the technical details. AFAICT, the whole driver is still
broken in mainline kernel (since 3.20). An upstream fixed is
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.18
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
ipmmu is always registered
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