Bug 205801

Summary:	ignore_msrs =Y and report_ignored_msrs = N not working
Product:	Virtualization	Reporter:	Ilya Yakushin (harliff)
Component:	kvm	Assignee:	virtualization_kvm
Status:	NEW ---
Severity:	low	CC:	mohdforever007
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	5.0.15-1-pve (from proxmox)	Subsystem:
Regression:	No	Bisected commit-id:

Description Ilya Yakushin 2019-12-08 15:27:10 UTC

There is a VM (windows 2016) which constantly generating more than 10 messages every second like this:
```
kvm [35691]: vcpu1, guest rIP: 0xfffff800c9fedbb3 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x1, nop
```

I can't prevent the VM from generating these MSRs due to proprietary software running inside it (maybe its due to some kind of software protection, but I'm not sure). So I wish to be able to disable this messages on KVM level or filter messages from getting to the kernel ring buffer (shown by dmesg). 

I've tried to set kvm module parameters -- without success:
- echo Y > /sys/module/kvm/parameters/ignore_msrs
- echo N > /sys/module/kvm/parameters/report_ignored_msrs

Is it due to a bug or I'm misunderstanding whats these parameters should do?

May you suggest me a workaround (to prevent these messages from getting shown on console/via dmesg/via journalctl -k)?

Comment 1 Ilya Yakushin 2019-12-08 15:40:16 UTC

The VM runned as:

/usr/bin/kvm -id 302 -name <skipped> -chardev socket,id=qmp,path=/var/run/qemu-server/302.qmp,server,nowait -mon chardev=qmp,mode=control -chardev socket,id=qmp-event,path=/var/run/qmeventd.sock,reconnect=5 -mon chardev=qmp-event,mode=control -pidfile /var/run/qemu-server/302.pid -daemonize -smbios type=1,uuid=9b793bd8-30b0-400d-8196-6264858d3300 -smp 1,sockets=1,cores=4,maxcpus=4 -device kvm64-x86_64-cpu,id=cpu2,socket-id=0,core-id=1,thread-id=0 -device kvm64-x86_64-cpu,id=cpu3,socket-id=0,core-id=2,thread-id=0 -device kvm64-x86_64-cpu,id=cpu4,socket-id=0,core-id=3,thread-id=0 -nodefaults -boot menu=on,strict=on,reboot-timeout=1000,splash=/usr/share/qemu-server/bootsplash.jpg -vnc unix:/var/run/qemu-server/302.vnc,password -no-hpet -cpu kvm64,+lahf_lm,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,hv_synic,hv_stimer,hv_tlbflush,hv_ipi,enforce -m size=1024,slots=255,maxmem=4194304M -object memory-backend-ram,id=ram-node0,size=1024M -numa node,nodeid=0,cpus=0-3,memdev=ram-node0 -object memory-backend-ram,id=mem-dimm0,size=512M -device pc-dimm,id=dimm0,memdev=mem-dimm0,node=0 -object memory-backend-ram,id=mem-dimm1,size=512M -device pc-dimm,id=dimm1,memdev=mem-dimm1,node=0 -object memory-backend-ram,id=mem-dimm2,size=512M -device pc-dimm,id=dimm2,memdev=mem-dimm2,node=0 -object memory-backend-ram,id=mem-dimm3,size=512M -device pc-dimm,id=dimm3,memdev=mem-dimm3,node=0 -object memory-backend-ram,id=mem-dimm4,size=512M -device pc-dimm,id=dimm4,memdev=mem-dimm4,node=0 -object memory-backend-ram,id=mem-dimm5,size=512M -device pc-dimm,id=dimm5,memdev=mem-dimm5,node=0 -object memory-backend-ram,id=mem-dimm6,size=512M -device pc-dimm,id=dimm6,memdev=mem-dimm6,node=0 -object memory-backend-ram,id=mem-dimm7,size=512M -device pc-dimm,id=dimm7,memdev=mem-dimm7,node=0 -object memory-backend-ram,id=mem-dimm8,size=512M -device pc-dimm,id=dimm8,memdev=mem-dimm8,node=0 -object memory-backend-ram,id=mem-dimm9,size=512M -device pc-dimm,id=dimm9,memdev=mem-dimm9,node=0 -object memory-backend-ram,id=mem-dimm10,size=512M -device pc-dimm,id=dimm10,memdev=mem-dimm10,node=0 -object memory-backend-ram,id=mem-dimm11,size=512M -device pc-dimm,id=dimm11,memdev=mem-dimm11,node=0 -object memory-backend-ram,id=mem-dimm12,size=512M -device pc-dimm,id=dimm12,memdev=mem-dimm12,node=0 -object memory-backend-ram,id=mem-dimm13,size=512M -device pc-dimm,id=dimm13,memdev=mem-dimm13,node=0 -object memory-backend-ram,id=mem-dimm14,size=512M -device pc-dimm,id=dimm14,memdev=mem-dimm14,node=0 -device pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f -device pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e -device piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device usb-tablet,id=tablet,bus=uhci.0,port=1 -device VGA,id=vga,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi initiator-name=iqn.1993-08.org.debian:01:82e1b7bc30 -device virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5 -drive file=/dev/zvol/fastpool/vm/vm-302-disk-0,if=none,id=drive-scsi0,format=raw,cache=none,aio=native,detect-zeroes=on -device scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,bootindex=100 -netdev type=tap,id=net0,ifname=tap302i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on -device virtio-net-pci,mac=F6:8B:2F:03:9F:2A,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300 -rtc driftfix=slew,base=localtime -machine type=pc -global kvm-pit.lost_tick_policy=discard

Comment 2 Ilya Yakushin 2020-01-21 21:30:04 UTC

Have anybody read this bug report? Any questions?

Comment 3 mohdforever 2022-03-23 05:19:57 UTC

echo 1 | sudo tee /sys/module/kvm/parameters/ignore_msrs