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Type: Bug
Resolution: Unresolved
Priority: Normal
Fix Version/s: rhel-10.1
Affects Version/s: rhel-9.3.0
Component/s: virtio-win / virtio-win-prewhql
Labels:

Regression:
None
Severity:
Moderate
Keywords:

CustomerScenariosInitiative

Pool Team:

rhel-sst-virtualization-windows
Sub-System Group:

ssg_virtualization

Story Points:
5
Blocked:
False
Blocked Reason:

Hide

None

Show
None
Product Documentation Required:
None
Sprint:
None

Preliminary Testing:
None
Test Link:
https://polarion.engineering.redhat.com/polarion/#/project/RHELVIRT/workitem?id=VIRT-95542
Test Coverage:

Automated

Release Note Type:
Known Issue
Release Note Text:

Hide
.The virtio balloon driver sometimes does not work on Windows 10 VMs

Under certain circumstances, the virtio-balloon driver does not work correctly on virtual machines (VMs) that use a Windows 10 guest operating system. As a consequence, such VMs might not use their assigned memory efficiently. There is currently no workaround for this issue.

Show
.The virtio balloon driver sometimes does not work on Windows 10 VMs Under certain circumstances, the virtio-balloon driver does not work correctly on virtual machines (VMs) that use a Windows 10 guest operating system. As a consequence, such VMs might not use their assigned memory efficiently. There is currently no workaround for this issue.
Release Note Status:
Done

Experience:
Architecture:

x86_64
Bugzilla Bug:
RHBZ: 2189948

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

Description of problem:
Boot up win10-64 guest with 30G memory, try to evict guest memory to a minimum value and then try to enlarge it to the maximum one, and then evict it to half of the maximum one, and then reboot guest os, after the system booted up and watch the balloon value, it was not ballooned to the expected value(15G), so seems that balloon doesn't work after os reboot.

Here is the qmp log before and after the system reboot.
```
2023-04-26 02:40:56:

{"execute": "query-balloon", "id": "lRp6Y5LN"}

2023-04-26 02:40:56: {"return":

{"actual": 18107858944}

, "id": "lRp6Y5LN"}
2023-04-26 02:41:11: {"timestamp":

{"seconds": 1682491271, "microseconds": 286694}

, "event": "BALLOON_CHANGE", "data": {"actual": 32212254720}}
2023-04-26 02:41:43: {"timestamp":

{"seconds": 1682491303, "microseconds": 607396}

, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
2023-04-26 02:41:43: {"timestamp":

{"seconds": 1682491303, "microseconds": 615880}

, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
2023-04-26 02:43:45: {"timestamp":

{"seconds": 1682491311, "microseconds": 66905}

, "event": "BALLOON_CHANGE", "data": {"actual": 32210157568}}
2023-04-26 02:43:45: {"timestamp":

{"seconds": 1682491312, "microseconds": 62397}

, "event": "BALLOON_CHANGE", "data": {"actual": 32208060416}}
2023-04-26 02:43:45:

{"execute": "query-balloon", "id": "11PU1Cgr"}

2023-04-26 02:43:45: {"return":

{"actual": 32208060416}

, "id": "11PU1Cgr"}
2023-04-26 02:43:55:

{"execute": "query-balloon", "id": "FUSSA9YL"}

2023-04-26 02:43:55: {"return":

{"actual": 32208060416}

, "id": "FUSSA9YL"}
2023-04-26 02:44:03:

{"execute": "query-balloon", "id": "VwuFkLts"}

2023-04-26 02:44:03: {"return":

{"actual": 32208060416}

, "id": "VwuFkLts"}
2023-04-26 02:44:12:

{"execute": "query-balloon", "id": "TNPdjEFX"}

2023-04-26 02:44:12: {"return":

{"actual": 32208060416}

, "id": "TNPdjEFX"}
2023-04-26 02:44:20:

{"execute": "query-balloon", "id": "CUF3X1hU"}

2023-04-26 02:44:20: {"return":

{"actual": 32208060416}

, "id": "CUF3X1hU"}
2023-04-26 02:44:28:

{"execute": "query-balloon", "id": "CDDg0jXH"}

2023-04-26 02:44:28: {"return":

{"actual": 32208060416}

, "id": "CDDg0jXH"}
2023-04-26 02:44:37:

{"execute": "query-balloon", "id": "i7zjcSx5"}

2023-04-26 02:44:37: {"return":

{"actual": 32208060416}

, "id": "i7zjcSx5"}
2023-04-26 02:44:45:

{"execute": "query-balloon", "id": "Pkd82nf3"}

2023-04-26 02:44:45: {"return":

{"actual": 32208060416}

, "id": "Pkd82nf3"}
2023-04-26 02:44:53:

{"execute": "query-balloon", "id": "agkGOKzR"}

2023-04-26 02:44:53: {"return":

{"actual": 32208060416}

, "id": "agkGOKzR"}
2023-04-26 02:45:02:

{"execute": "query-balloon", "id": "yEjAWK7X"}

2023-04-26 02:45:02: {"return":

{"actual": 32208060416}

, "id": "yEjAWK7X"}
2023-04-26 02:45:10:

{"execute": "query-balloon", "id": "xihgQ1Wg"}

2023-04-26 02:45:10: {"return":

{"actual": 32208060416}

, "id": "xihgQ1Wg"}
2023-04-26 02:45:18:

{"execute": "query-balloon", "id": "bBPNk1gV"}

2023-04-26 02:45:18: {"return":

{"actual": 32208060416}

, "id": "bBPNk1gV"}
```
Note:
The guest rebooted successfully and quickly.

Version-Release number of selected component (if applicable):
virtio-win-prewhql-0.1-236
kernel-5.14.0-302.el9.x86_64
qemu-kvm-8.0.0-1.el9.x86_64
seabios-bin-1.16.1-1.el9.noarch

How reproducible:
I tried on two hosts:
dell-per750-14: 4/10 (all logs: http://virtqetools.lab.eng.pek2.redhat.com/kvm_autotest_job_log/?jobid=7787589)
dell-per750-13: 1/10

Steps to Reproduce:
1. boot up win10-64 guest with balloon device(q35 + seabios)
-m 30720 \
-device virtio-balloon-pci,id=balloon0,bus=pcie-root-port-4,addr=0x0 \

2. in guest, install balloon driver

3. Run evict test to get the minimum memory of guests.
2023-04-26 02:39:13: {"execute": "balloon", "arguments":

{"value": 1048576}

, "id": "DHbP7HBM"}
2023-04-26 02:39:13: {"return": {}, "id": "DHbP7HBM"}
....
2023-04-26 02:40:00: {"timestamp":

{"seconds": 1682491172, "microseconds": 55184}

, "event": "BALLOON_CHANGE", "data": {"actual": 2919235584}}
2023-04-26 02:40:00:

{"execute": "query-balloon", "id": "FBLeXsgq"}

2023-04-26 02:40:00: {"return":

{"actual": 2919235584}

, "id": "FBLeXsgq"}

4. balloon memory back to the maximum one
2023-04-26 02:40:00: {"execute": "balloon", "arguments":

{"value": 32212254720}

, "id": "kfT5rtMt"}
2023-04-26 02:40:38:

{"execute": "query-balloon", "id": "RTgEDUyN"}

2023-04-26 02:40:38: {"return":

{"actual": 32212254720}

, "id": "RTgEDUyN"}

5. balloon memory to about half the size of the maximum one.
2023-04-26 02:40:45: {"execute": "balloon", "arguments":

{"value": 18107858944}

, "id": "lm8svpko"}
...
2023-04-26 02:40:56:

{"execute": "query-balloon", "id": "SGIc3MC5"}

2023-04-26 02:40:56: {"return":

{"actual": 18107858944}

, "id": "SGIc3MC5"}

6. reboot the guest.
023-04-26 02:41:11: {"timestamp":

{"seconds": 1682491271, "microseconds": 286694}

, "event": "BALLOON_CHANGE", "data": {"actual": 32212254720}}
2023-04-26 02:41:43: {"timestamp":

{"seconds": 1682491303, "microseconds": 607396}

, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
2023-04-26 02:41:43: {"timestamp":

{"seconds": 1682491303, "microseconds": 615880}

, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
2023-04-26 02:43:45: {"timestamp":

{"seconds": 1682491311, "microseconds": 66905}

, "event": "BALLOON_CHANGE", "data": {"actual": 32210157568}}
2023-04-26 02:43:45: {"timestamp":

{"seconds": 1682491312, "microseconds": 62397}

, "event": "BALLOON_CHANGE", "data": {"actual": 32208060416}}
2023-04-26 02:43:45:

{"execute": "query-balloon", "id": "11PU1Cgr"}

2023-04-26 02:43:45: {"return":

{"actual": 32208060416}

, "id": "11PU1Cgr"}
2023-04-26 02:43:55:

{"execute": "query-balloon", "id": "FUSSA9YL"}

2023-04-26 02:43:55: {"return":

{"actual": 32208060416}

, "id": "FUSSA9YL"}
2023-04-26 02:44:03:

{"execute": "query-balloon", "id": "VwuFkLts"}

2023-04-26 02:44:03: {"return":

{"actual": 32208060416}

, "id": "VwuFkLts"}
2023-04-26 02:44:12:

{"execute": "query-balloon", "id": "TNPdjEFX"}

2023-04-26 02:44:12: {"return":

{"actual": 32208060416}

, "id": "TNPdjEFX"}

Actual results:
The memory value came back to the maximum one.

Expected results:
After rebooting os, the memory keeps the value like before.

Additional info:

external trackers

Polarion test case RHELVIRT/workitem?id=VIRT-95542

Red Hat Issue Tracker RHEL-464

Red Hat Issue Tracker RHELPLAN-155859

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