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Bug
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Resolution: Unresolved
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Normal
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None
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rhel-10.1, rhel-9.7
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None
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No
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Moderate
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rhel-systemd
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ssg_core_services
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2
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False
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False
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Yes
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None
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None
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None
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Known Issue
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Done
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Unspecified
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Unspecified
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Unspecified
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s390x
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None
What were you trying to do that didn't work?
- For rhel10, in /lib/udev/rules.d/40-redhat-hotplug.rules, memory hotplug rule is disabled for s390x:
#Memory hotadd request SUBSYSTEM!="memory", GOTO="memory_hotplug_end" ACTION!="add", GOTO="memory_hotplug_end" CONST{arch}=="s390*", GOTO="memory_hotplug_end"
2. For rhel9.7, in /lib/udev/rules.d/40-redhat.rules, memory hotplug rule is disabled for s390x:
#Memory hotadd request SUBSYSTEM!="memory", GOTO="memory_hotplug_end" ACTION!="add", GOTO="memory_hotplug_end" CONST{arch}=="s390*", GOTO="memory_hotplug_end"
So if hotplug a virtio-mem to guest, the hotplug memory is offline:
# lsmem
RANGE SIZE STATE REMOVABLE BLOCK
0x0000000000000000-0x000000003fffffff 1G online yes 0-7
0x0000000040000000-0x000000007fffffff 1G offline 8-15
Please provide the package NVR for which the bug is seen:
for rhel9.7:
# rpm -q systemd systemd-252-53.el9.s390x
for rhel10.1:
# rpm -q systemd systemd-257-11.el10.s390x
How reproducible is this bug?: 100%
Steps to reproduce
- Start a domain with below xml:
<maxMemory unit='KiB'>10485760</maxMemory>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory> - Hot plug a virtio-mem memory device to the guest:
# cat virtio-mem.xml <memory model='virtio-mem'> <target> <size unit='KiB'>2097152</size> <block unit='KiB'>1024</block> <requested unit='KiB'>1048576</requested> </target> </memory> # virsh attach-device avocado-vt-vm1 virtio-mem.xml Device attached successfully
3. Check the domain config xml for virtio-mem device:
# virsh dumpxml avocado-vt-vm1 --xpath //devices/memory <memory model="virtio-mem"> <target> <size unit="KiB">2097152</size> <block unit="KiB">1024</block> <requested unit="KiB">1048576</requested> <current unit="KiB">1048576</current> <address base="0x40000000"/> </target> <alias name="virtiomem0"/> <address type="ccw" cssid="0xfe" ssid="0x0" devno="0x0009"/> </memory>
4. Check memory info by cmd lsmem in guest, and find out newly hotplug memory is offline.
# lsmem RANGE SIZE STATE REMOVABLE BLOCK 0x0000000000000000-0x000000003fffffff 1G online yes 0-7 0x0000000040000000-0x000000007fffffff 1G offline 8-15 Memory block size: 128M Total online memory: 1G Total offline memory: 1G
Expected results
Hotplug memory should be online
Actual results
Hotplug memory is offline
Additional info:
If comment out the line in udev rule file like below:
#CONST{arch}=="s390*", GOTO="memory_hotplug_end"
Then the hotplug memory could be online.
