[regression] cannot use more than one vcpu
Bug #287533 reported by
Jamie Strandboge
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| libvirt (Ubuntu) |
Fix Released
|
High
|
Jamie Strandboge | ||
Bug Description
Binary package hint: virt-manager
When using x86_64 as the architecture, and kvm as the hyperviser, I cannot use more than 1 VCPU on my dual core system. I get this error message:
Number of vcpus must be no greater than 1 for this vm type
virt-manager: 0.5.4-2ubuntu1
Related branches
| description: | updated |
| description: | updated |
Revision history for this message
| Jamie Strandboge (jdstrand) wrote | #1 |
Revision history for this message
| Jamie Strandboge (jdstrand) wrote | #2 |
| Changed in virt-manager: | |
| assignee: | nobody → jdstrand |
| status: | New → Triaged |
| Changed in libvirt: | |
| importance: | Undecided → High |
Revision history for this message
| Jamie Strandboge (jdstrand) wrote | #3 |
| Changed in libvirt: | |
| status: | Triaged → Fix Committed |
Revision history for this message
| Launchpad Janitor (janitor) wrote | #4 |
| Changed in libvirt: | |
| status: | Fix Committed → Fix Released |
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Problem is due to this code in qemudGetMaxVCPUs() from qemu_driver.c of libvirt:
/* XXX future KVM will support SMP. Need to probe
kernel to figure out KVM module version i guess */
if (STRCASEEQ(type, "kvm"))
return 1;
Apparently, kvm in hardy and intrepid can do vcpus up to 16. As a workaround, I hacked a small patch to /usr/share/
--- ./util.py.orig 2008-10-22 09:54:01.000000000 -0500
+++ util.py 2008-10-22 10:03:09.000000000 -0500
@@ -220,7 +220,11 @@
if type is None:
type = conn.getType()
try:
- max = conn.getMaxVcpu
+ # workaround for LP: #287533
+ if type == "kvm":
+ max = 16
+ else:
+ max = conn.getMaxVcpu
except libvirt.
max = 32
return max
While this is very likely not the patch we should include, it does allow my to use virt-manager and virt-install for intrepid ISO testing with multiple VCPUs.