Hi Ju,
On Thu, Oct 01, 2020 at 11:30:14PM +0900, Ju Hyung Park wrote:
> Hi Stefano,
>
> On Thu, Oct 1, 2020 at 5:59 PM Stefano Garzarella <sgarz...@redhat.com> wrote:
> > Please, can you share the qemu command line that you are using?
> > This can be useful for the analysis.
>
> Sure.
Thanks for sharing.
The issue seems related to io_uring and the new io_uring fd monitoring
implementation available from QEMU 5.0.
I'll try to reproduce.
For now, as a workaround, you can rebuild qemu by disabling io-uring support:
../configure --disable-linux-io-uring ...
Thanks,
Stefano
>
> QEMU:
> /usr/bin/qemu-system-x86_64 -name guest=win10,debug-threads=on -S
> -object
> secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-win10/master-key.aes
> -blockdev
> {"driver":"file","filename":"/usr/share/OVMF/OVMF_CODE.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}
> -blockdev
> {"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}
> -blockdev
> {"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/win10_VARS.fd","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}
> -blockdev
> {"node-name":"libvirt-pflash1-format","read-only":false,"driver":"raw","file":"libvirt-pflash1-storage"}
> -machine
> pc-q35-5.0,accel=kvm,usb=off,vmport=off,dump-guest-core=off,mem-merge=off,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format
> -cpu
> Skylake-Client-IBRS,ss=on,vmx=on,hypervisor=on,tsc-adjust=on,clflushopt=on,umip=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaves=on,pdpe1gb=on,ibpb=on,amd-ssbd=on,fma=off,avx=off,f16c=off,rdrand=off,bmi1=off,hle=off,avx2=off,bmi2=off,rtm=off,rdseed=off,adx=off,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff,hv-vpindex,hv-runtime,hv-synic,hv-stimer,hv-reset
> -m 8192 -mem-prealloc -mem-path /dev/hugepages/libvirt/qemu/1-win10
> -overcommit mem-lock=off -smp 4,sockets=1,dies=1,cores=2,threads=2
> -uuid 7ccc3031-1dab-4267-b72a-d60065b5ff7f -display none
> -no-user-config -nodefaults -chardev
> socket,id=charmonitor,fd=32,server,nowait -mon
> chardev=charmonitor,id=monitor,mode=control -rtc
> base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=delay
> -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global
> ICH9-LPC.disable_s4=1 -boot menu=off,strict=on -device
> pcie-root-port,port=0x8,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x1
> -device pcie-root-port,port=0x9,chassis=2,id=pci.2,bus=pcie.0,addr=0x1.0x1
> -device pcie-root-port,port=0xa,chassis=3,id=pci.3,bus=pcie.0,addr=0x1.0x2
> -device pcie-root-port,port=0xb,chassis=4,id=pci.4,bus=pcie.0,addr=0x1.0x3
> -device pcie-pci-bridge,id=pci.5,bus=pci.2,addr=0x0 -device
> qemu-xhci,id=usb,bus=pci.1,addr=0x0 -blockdev
> {"driver":"host_device","filename":"/dev/disk/by-partuuid/05c3750b-060f-4703-95ea-6f5e546bf6e9","node-name":"libvirt-1-storage","cache":{"direct":false,"no-flush":true},"auto-read-only":true,"discard":"unmap"}
> -blockdev
> {"node-name":"libvirt-1-format","read-only":false,"discard":"unmap","detect-zeroes":"unmap","cache":{"direct":false,"no-flush":true},"driver":"raw","file":"libvirt-1-storage"}
> -device
> virtio-blk-pci,scsi=off,bus=pcie.0,addr=0xa,drive=libvirt-1-format,id=virtio-disk0,bootindex=1,write-cache=on
> -netdev tap,fd=34,id=hostnet0 -device
> e1000,netdev=hostnet0,id=net0,mac=52:54:00:c6:bb:bc,bus=pcie.0,addr=0x3
> -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x4 -device
> hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device
> vfio-pci,host=0000:00:02.0,id=hostdev0,bus=pcie.0,addr=0x2,rombar=0
> -device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x8 -object
> rng-random,id=objrng0,filename=/dev/urandom -device
> virtio-rng-pci,rng=objrng0,id=rng0,bus=pcie.0,addr=0x9 -msg
> timestamp=on
>
> And I use libvirt 6.3.0 to manage the VM. Here's an xml of my VM.
>
> <domain type="kvm">
> <name>win10</name>
> <uuid>7ccc3031-1dab-4267-b72a-d60065b5ff7f</uuid>
> <metadata>
> <libosinfo:libosinfo
> xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0";>
> <libosinfo:os id="http://microsoft.com/win/10"/>
> </libosinfo:libosinfo>
> </metadata>
> <memory unit="KiB">8388608</memory>
> <currentMemory unit="KiB">8388608</currentMemory>
> <memoryBacking>
> <hugepages/>
> <nosharepages/>
> </memoryBacking>
> <vcpu placement="static">4</vcpu>
> <cputune>
> <vcpupin vcpu="0" cpuset="0"/>
> <vcpupin vcpu="1" cpuset="2"/>
> <vcpupin vcpu="2" cpuset="1"/>
> <vcpupin vcpu="3" cpuset="3"/>
> </cputune>
> <os>
> <type arch="x86_64" machine="pc-q35-5.0">hvm</type>
> <loader readonly="yes" type="pflash">/usr/share/OVMF/OVMF_CODE.fd</loader>
> <nvram>/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
> <boot dev="hd"/>
> <bootmenu enable="no"/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <hyperv>
> <relaxed state="on"/>
> <vapic state="on"/>
> <spinlocks state="on" retries="8191"/>
> <vpindex state="on"/>
> <runtime state="on"/>
> <synic state="on"/>
> <stimer state="on"/>
> <reset state="on"/>
> </hyperv>
> <vmport state="off"/>
> </features>
> <cpu mode="host-model" check="partial">
> <topology sockets="1" dies="1" cores="2" threads="2"/>
> </cpu>
> <clock offset="localtime">
> <timer name="rtc" tickpolicy="catchup"/>
> <timer name="pit" tickpolicy="delay"/>
> <timer name="hpet" present="no"/>
> <timer name="hypervclock" present="yes"/>
> </clock>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>destroy</on_crash>
> <pm>
> <suspend-to-mem enabled="no"/>
> <suspend-to-disk enabled="no"/>
> </pm>
> <devices>
> <emulator>/usr/bin/qemu-system-x86_64</emulator>
> <disk type="block" device="disk">
> <driver name="qemu" type="raw" cache="unsafe" discard="unmap"
> detect_zeroes="unmap"/>
> <source
> dev="/dev/disk/by-partuuid/05c3750b-060f-4703-95ea-6f5e546bf6e9"/>
> <target dev="vda" bus="virtio"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x0a"
> function="0x0"/>
> </disk>
> <controller type="pci" index="0" model="pcie-root"/>
> <controller type="pci" index="1" model="pcie-root-port">
> <model name="pcie-root-port"/>
> <target chassis="1" port="0x8"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x01"
> function="0x0" multifunction="on"/>
> </controller>
> <controller type="pci" index="2" model="pcie-root-port">
> <model name="pcie-root-port"/>
> <target chassis="2" port="0x9"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x01"
> function="0x1"/>
> </controller>
> <controller type="pci" index="3" model="pcie-root-port">
> <model name="pcie-root-port"/>
> <target chassis="3" port="0xa"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x01"
> function="0x2"/>
> </controller>
> <controller type="pci" index="4" model="pcie-root-port">
> <model name="pcie-root-port"/>
> <target chassis="4" port="0xb"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x01"
> function="0x3"/>
> </controller>
> <controller type="pci" index="5" model="pcie-to-pci-bridge">
> <model name="pcie-pci-bridge"/>
> <address type="pci" domain="0x0000" bus="0x02" slot="0x00"
> function="0x0"/>
> </controller>
> <controller type="usb" index="0" model="qemu-xhci">
> <address type="pci" domain="0x0000" bus="0x01" slot="0x00"
> function="0x0"/>
> </controller>
> <controller type="sata" index="0">
> <address type="pci" domain="0x0000" bus="0x00" slot="0x1f"
> function="0x2"/>
> </controller>
> <interface type="network">
> <mac address="52:54:00:c6:bb:bc"/>
> <source network="default"/>
> <model type="e1000"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x03"
> function="0x0"/>
> </interface>
> <input type="mouse" bus="ps2"/>
> <input type="keyboard" bus="ps2"/>
> <sound model="ich9">
> <address type="pci" domain="0x0000" bus="0x00" slot="0x04"
> function="0x0"/>
> </sound>
> <hostdev mode="subsystem" type="pci" managed="yes">
> <source>
> <address domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
> </source>
> <rom bar="off"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x02"
> function="0x0"/>
> </hostdev>
> <memballoon model="virtio">
> <address type="pci" domain="0x0000" bus="0x00" slot="0x08"
> function="0x0"/>
> </memballoon>
> <rng model="virtio">
> <backend model="random">/dev/urandom</backend>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x09"
> function="0x0"/>
> </rng>
> </devices>
> </domain>
>
