On Mon, Oct 05, 2020 at 10:50:08AM +0200, Michal Privoznik wrote:
On 10/3/20 1:15 AM, Masayoshi Mizuma wrote:
On Fri, Oct 02, 2020 at 11:31:32AM -0400, Masayoshi Mizuma wrote:
Hello Jan, and Michal,
commit: 88957116c9 ("qemu: Use memory-backend-* for regular guest memory") gets the system memory sharable without numa config. The qemu options with the patch will be like as:
-machine pc-q35-5.2,accel=kvm,usb=off,vmport=off,smm=on,dump-guest-core=off,memory-backend=pc.ram \ -object memory-backend-file,id=pc.ram,mem-path=/var/lib/libvirt/qemu/ram/2-Test/pc.ram,share=yes,size=17179869184 \
So, we can remove the numa restriction of virtiofs, right? The patch to remove that is the bottom of this email.
And, 88957116c9 seems to introduce another restriction which we cannot create numa nodes on the machine. I got the following message when I set the numa config and started the VM:
2020-10-02T00:31:46.780374Z qemu-system-x86_64: '-machine memory-backend' and '-numa memdev' properties are mutually exclusive
It seems that this isn't a restriction for virtiofs. It's a bug introduced by commit: 88957116c9. <numa> element doesn't work regardless of virtiofs config...
Do you have domain XML that is failing?
Yes, I got the issue while virsh start: # virsh start Test error: Failed to start domain Test error: internal error: qemu unexpectedly closed the monitor: 2020-10-05T17:31:21.078134Z qemu-system-x86_64: '-machine memory-backend' and '-numa memdev' properties are mutually exclusive # Here is the domain XML. I'm using libvirt with the head commit: 7d77fdb90f, and qemu with the head commit: 36d9c2883e. ========= <domain type='kvm'> <name>Test</name> <uuid>12785e5c-542e-4896-87f3-2e068fb7107f</uuid> <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='x86_64' machine='pc-q35-5.2'>hvm</type> </os> <features> <acpi/> <apic/> <vmport state='off'/> <smm state='on'/> <vmcoreinfo state='on'/> </features> <cpu mode='host-model' check='partial'> <numa> <cell id='0' cpus='0-3' memory='8388608' unit='KiB'/> </numa> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/local/bin/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/Test.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='1'/> <address type='pci' domain='0x0000' bus='0x04' slot='0x00' 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='0x10'/> <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-root-port'> <model name='pcie-root-port'/> <target chassis='5' port='0xc'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x4'/> </controller> <controller type='pci' index='6' model='pcie-root-port'> <model name='pcie-root-port'/> <target chassis='6' port='0xd'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x5'/> </controller> <controller type='usb' index='0' model='qemu-xhci'> <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/> </controller> <controller type='sata' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:c1:a2:80'/> <source network='default'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> <serial type='pty'> <target type='isa-serial' port='0'> <model name='isa-serial'/> </target> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='unix'> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/> </memballoon> <rng model='virtio'> <backend model='random'>/dev/urandom</backend> <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> </rng> </devices> </domain> ========= Thanks, Masa