Description of problem: [ppc64le] have this fix for rhel8.4 av (spapr: Allow memory unplug to always succeed) Version-Release number of selected component (if applicable): qemu-kvm-5.2.0-2.scrmod+el8.4.0+9296+f2b1d20b.wrb210106.ppc64le How reproducible: 3/3 Steps to Reproduce: 1.hot-unplug pc-dimm on early stage of booting up a guest (see also bz1901837 for rhel8.4) /usr/libexec/qemu-kvm -name guest=nrs,debug-threads=on -machine pseries,accel=kvm,cap-ccf-assist=off -m size=20G,slots=256,maxmem=100G -smp 4,sockets=4,cores=1,threads=1 -uuid d7987973-2467-43ff-b8d2-acefc6ac59e5 -display none -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/tmp/qmp,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -boot strict=on -device qemu-xhci,id=usb,bus=pci.0,addr=0x3 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x2 -drive file=rhel840-ppc64le-virtio-scsi.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on -monitor stdio -chardev socket,id=serial_id_serial0,path=/tmp/S,server,nowait -device spapr-vty,reg=0x30000000,chardev=serial_id_serial0 -monitor unix:/tmp/monitor3,server,nowait -object memory-backend-ram,id=mem1,size=20G QEMU 4.2.0 monitor - type 'help' for more information (qemu) device_add pc-dimm,id=dimm1,memdev=mem1,node=0 (qemu) system_reset (qemu) device_del dimm1 Error: Memory hot unplug not supported for this guest (qemu) device_del dimm1 Error: Memory hot unplug not supported for this guest (qemu) device_del dimm1 Error: Memory hot unplug not supported for this guest (qemu) device_del dimm1 Error: Memory hot unplug not supported for this guest Actual results: Can't remove pc-dimm at early stage booting up and error's pop up Expected results: The linux kernel has been supporting these since 4.11. All recent enough guests are thus capable of handling the removal of a memory device at all time, including during early boot. Additional info: There's similar issue on rhel8.4 bz1901837 , it's an improvement for us and prefer to have this fix on rhel8.4 AV as well, so file this bug, thanks a lot.
Hi Greg, The test is on going, thanks. Min
Re-test the scratch build, the fix should work well, and QE will also provide some regression test for this feature as soon as I get the result. Thanks.
Created attachment 1750739 [details] test result The memory hotplug regression test passed on build from comment6, thanks.
Verified the bug with the build qemu-kvm-5.2.0-5.module+el8.4.0+9775+0937c167 kenrel-4.18.0-277.el8.ppc64le QEMU 5.2.0 monitor - type 'help' for more information (qemu) device_add pc-dimm,id=dimm1,memdev=mem1,node=0 (qemu) system_reset (qemu) device_del dimm1 (qemu) device_del dimm1 Error: Memory unplug already in progress for device dimm1 (qemu) device_del dimm1 Error: Memory unplug already in progress for device dimm1 (qemu) device_del dimm1 Error: Memory unplug already in progress for device dimm1 (qemu) device_del dimm1 Error: Memory unplug already in progress for device dimm1 (qemu) device_del dimm1 Error: Memory unplug already in progress for device dimm1 (qemu) device_del dimm1 Error: Device 'dimm1' not found Actual results, The pc-dimm can be removed at early rebooting stage Expected results, The pc-dimm can be removed at early rebooting stage The issue should be fixed, thanks.
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 (virt:av bug fix and enhancement update), 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://access.redhat.com/errata/RHBA-2021:2098