Bug 1094285
| Summary: | Hot plug CPU not working with RHEL6 machine types running on RHEL7 host. | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | Karen Noel <knoel> | ||||
| Component: | qemu-kvm | Assignee: | Paolo Bonzini <pbonzini> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> | ||||
| Severity: | high | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 7.0 | CC: | areis, flang, gklein, hhuang, iheim, imammedo, jherrman, juzhang, knoel, lersek, lpeer, michal.skrivanek, michen, mkalinin, mrezanin, nsednev, pbonzini, qzhang, rbalakri, Rhev-m-bugs, virt-maint, xfu, yeylon | ||||
| Target Milestone: | rc | Keywords: | ZStream | ||||
| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | virt | ||||||
| Fixed In Version: | qemu-kvm-1.5.3-62.el7 | Doc Type: | Bug Fix | ||||
| Doc Text: |
Previously, an internal error prevented KVM from executing a CPU hot plug on a Red Hat Enterprise Linux 7 guest running on a Red Hat Enterprise Linux 7 host. This update addresses the internal error and CPU hot plugging in the described scenario now functions correctly.
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Story Points: | --- | ||||
| Clone Of: | 1093411 | Environment: | |||||
| Last Closed: | 2015-03-05 08:06:47 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 1076184, 1093411, 1094820 | ||||||
| Attachments: |
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Comment 1
Paolo Bonzini
2014-05-05 13:48:34 UTC
Reproduced this issue with qemu-kvm-rhev-1.5.3-60.el7ev.x86_64.
steps:
1.Boot qemu-kvm process as following command line
/usr/libexec/qemu-kvm -M rhel6.x.x -m 8G -smp 4,sockets=2,cores=2,thread=1,maxcpus=160 .......
2. check vcpu number
(qemu) info cpus
* CPU #0: pc=0x00000000000fe7e0 thread_id=32603
CPU #1: pc=0x00000000000f6277 (halted) thread_id=32604
CPU #2: pc=0x00000000000f6277 (halted) thread_id=32605
CPU #3: pc=0x00000000000f6277 (halted) thread_id=32606
3. hotplug vcpu via qmp command
{ "execute": "cpu-add", "arguments": { "id": 4 }}
result:
{"error": {"class": "GenericError", "desc": "Not supported"}}
4. re-check vcpu number
(qemu) info cpus
* CPU #0: pc=0x00000000000fe7e0 thread_id=32603
CPU #1: pc=0x00000000000f6277 (halted) thread_id=32604
CPU #2: pc=0x00000000000f6277 (halted) thread_id=32605
CPU #3: pc=0x00000000000f6277 (halted) thread_id=32606
Notes:
QE tested -M rhel6.0.0 ~ rhel6.5.0. All machine type rhel6.x.x don't work.
Created attachment 892795 [details]
[RHEL-7.0 qemu-kvm PATCH] pc: enable CPU hotplug for RHEL6.{45}u PIIX machines and disable it for Q35
Comment on attachment 892795 [details]
[RHEL-7.0 qemu-kvm PATCH] pc: enable CPU hotplug for RHEL6.{45}u PIIX machines and disable it for Q35
it was a wrong patch.
Reproduce this bug as follow version:
Host:
# uname -r
3.10.0-210.el7.x86_64
# rpm -q qemu-kvm-rhev
qemu-kvm-rhev-1.5.3-60.el7ev.x86_64
guest:
win2012r2
Steps:
1.Boot guest with "-M rhel6.5.0"
...-smp 2,maxcpus=8...
2.Hotadd vcpu
{ "execute": "cpu-add", "arguments": { "id":2 }}
{"error": {"class": "GenericError", "desc": "Not supported"}}
Results: Not support
Verify this bug as follow version:
Version:
# uname -r
3.10.0-210.el7.x86_64
# rpm -q qemu-kvm-rhev
qemu-kvm-rhev-1.5.3-82.el7ev.x86_64
Guest:wini2012r2
Steps
1.Boot guest with "-M rhel6.5.0"
...-M rhel6.5.0...-smp 2,maxcpus=8...
2.Hotadd vcpu
{ "execute": "cpu-add", "arguments": { "id":2 }}
{ "execute": "cpu-add", "arguments": { "id":3 }}
3.Tried the same steps for "-M rhel6.4.0/rhel6.3.0/rhel6.2.0/rhel6.1.0/rhel6.0.0/pc-i440fx-rhel7.0.0
Results:
...
{ "execute": "cpu-add", "arguments": { "id":2 }}
{"return": {}}
{ "execute": "cpu-add", "arguments": { "id":3 }}
{"return": {}}
In guest: can be see the new add vcpu
Addtinonal info:
1.Also tried rhel6 guest,work well
2.Tried on AMD machine,work well
According to above test ,this bug has been fixed.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2015-0349.html |