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Bug
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Resolution: Unresolved
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Undefined
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None
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rhel-9.2.0, rhel-9.3.0, rhel-9.4
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None
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Moderate
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rhel-virt-core
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ssg_virtualization
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5
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False
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False
-
-
None
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None
-
None
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None
-
-
x86_64
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None
What were you trying to do that didn't work?
Setting up a VM with a large number of CPUs (>255) requires an IOMMU device, such as below
<iommu model='intel'> <driver intremap='on' eim='on'/> </iommu>
However, if the VM has a large about of memory (i.e. >= 1T), the Guest will then fail to boot with a loop on this:
[ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: QI PRIOR: UNKNOWN qw0 = 0x0, qw1 = 0x0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: QI HEAD: Invalidation Wait qw0 = 0x200000025, qw1 = 0x10000061c04 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0 [ 1.303054] DMAR: QI HEAD: Invalidation Wait qw0 = 0x200000025, qw1 = 0x10000061c04 [ 1.303054] DMAR: VT-d detected Invalidation Queue Error: Reason 0
As a workaroud, booting the guest with the below in the command line makes it boot fine.
intremap=off
Please provide the package NVR for which bug is seen:
Both Guest and Host RHEL 9.4
kernel-5.14.0-427.23.1.el9_4.x86_64 qemu-kvm-8.2.0-11.el9_4.3.x86_64
How reproducible:
Always
Steps to reproduce
- Get a large machine for hypervisor
- Setup a VM with:
- >=1 T of RAM
- 255+ vCPUS (not really required to reproduce but its part of the use case)
- Enable IOMMU with <driver intremap='on' eim='on'/>
- Boot it
Expected results
Guest Runs
Actual results
Guest Hangs
