Hi, all, I have another question want to consult you. To enable DAX in virtiofs, according to the memu https://virtio-fs.gitlab.io/howto-qemu.html. I need to add "cache-size=2G" as below. -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs,cache-size=2G
My qemu command is: sudo qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 2 -m 4G -drive if=virtio,file=ubuntu.img -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -machine q35,memory-backend=mem -chardev socket,id=char0,path=/tmp/vhostqemu -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs_root,cache-size=2G -chardev stdio,mux=on,id=mon -mon chardev=mon,mode=readline -device virtio-serial-pci -device virtconsole,chardev=mon -vga none -display none And virtiofsd command is: sudo ./virtiofsd --socket-path=/tmp/vhostqemu -o source=/home/shirley/testdir -o cache=always But there is no option of "cache-size" in qemu 6.0, like below. So how to enable it? qemu-6.0.0$ qemu-system-x86_64 -device vhost-user-fs-pci,help vhost-user-fs-pci options: acpi-index=<uint32> - (default: 0) addr=<int32> - Slot and optional function number, example: 06.0 or 06 (default: -1) aer=<bool> - on/off (default: false) any_layout=<bool> - on/off (default: true) ats=<bool> - on/off (default: false) bootindex=<int32> chardev=<str> - ID of a chardev to use as a backend event_idx=<bool> - on/off (default: true) failover_pair_id=<str> indirect_desc=<bool> - on/off (default: true) iommu_platform=<bool> - on/off (default: false) migrate-extra=<bool> - on/off (default: true) modern-pio-notify=<bool> - on/off (default: false) multifunction=<bool> - on/off (default: false) notify_on_empty=<bool> - on/off (default: true) num-request-queues=<uint16> - (default: 1) packed=<bool> - on/off (default: false) page-per-vq=<bool> - on/off (default: false) queue-size=<uint16> - (default: 128) rombar=<uint32> - (default: 1) romfile=<str> romsize=<uint32> - (default: 4294967295) tag=<str> use-disabled-flag=<bool> - (default: true) use-started=<bool> - (default: true) vectors=<uint32> - (default: 4294967295) virtio-backend=<child<vhost-user-fs-device>> virtio-pci-bus-master-bug-migration=<bool> - on/off (default: false) x-ats-page-aligned=<bool> - on/off (default: true) x-disable-legacy-check=<bool> - (default: false) x-disable-pcie=<bool> - on/off (default: false) x-ignore-backend-features=<bool> - (default: false) x-pcie-deverr-init=<bool> - on/off (default: true) x-pcie-extcap-init=<bool> - on/off (default: true) x-pcie-flr-init=<bool> - on/off (default: true) x-pcie-lnkctl-init=<bool> - on/off (default: true) x-pcie-lnksta-dllla=<bool> - on/off (default: true) x-pcie-pm-init=<bool> - on/off (default: true) -----Original Message----- From: Zhao, Shirley Sent: Friday, July 8, 2022 8:40 AM To: Dr. David Alan Gilbert <dgilb...@redhat.com> Cc: Thomas Huth <th...@redhat.com>; qemu-devel@nongnu.org; virtio...@redhat.com; Stefan Hajnoczi <stefa...@redhat.com> Subject: RE: [Qemu] how to use viriofs in qemu without NUMA Yes, the qemu version is too old. My previous qemu version is 4.2, and I upgraded it into 6.0, and it worked now. Thanks a lot. - Shirley -----Original Message----- From: Dr. David Alan Gilbert <dgilb...@redhat.com> Sent: Tuesday, July 5, 2022 5:37 PM To: Zhao, Shirley <shirley.z...@intel.com> Cc: Thomas Huth <th...@redhat.com>; qemu-devel@nongnu.org; virtio...@redhat.com; Stefan Hajnoczi <stefa...@redhat.com> Subject: Re: [Qemu] how to use viriofs in qemu without NUMA * Zhao, Shirley (shirley.z...@intel.com) wrote: > Thanks for the information. > Yes, I also found the memory backend options on s390x, and also copy the > command to x86, but failed. > > The following is the command used to start qemu + virtiofs + ubuntu 20.04. > One is worked well using NUMA, another one is failed without NUMA. > Is there anything wrong? > > The worked one with NUMA options: > > qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 2 -m 4G -object > memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa > node,memdev=mem -chardev socket,id=char0,path=/tmp/vfsd.sock -device > vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs -chardev > stdio,mux=on,id=mon -mon chardev=mon,mode=readline -device > virtio-serial-pci -device virtconsole,chardev=mon -vga none -display > none -drive if=virtio,file=ubuntu.img > > The failed one without NUMA options: > > qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 2 -m 4G -object > memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -machine > q35,memory-backend=mem -chardev socket,id=char0,path=/tmp/vfsd.sock > -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs > -chardev stdio,mux=on,id=mon -mon chardev=mon,mode=readline -device > virtio-serial-pci -device virtconsole,chardev=mon -vga none -display > none -drive if=virtio,file=ubuntu.img What error did it give? 20.04 is quite old, what qemu version is it? I'd have to check when the memdev= went in. Dave > > Thanks. > - Shirley > > -----Original Message----- > From: Dr. David Alan Gilbert <dgilb...@redhat.com> > Sent: Tuesday, July 5, 2022 4:04 PM > To: Thomas Huth <th...@redhat.com> > Cc: Zhao, Shirley <shirley.z...@intel.com>; qemu-devel@nongnu.org; > virtio...@redhat.com; Stefan Hajnoczi <stefa...@redhat.com> > Subject: Re: [Qemu] how to use viriofs in qemu without NUMA > > * Thomas Huth (th...@redhat.com) wrote: > > On 05/07/2022 03.02, Zhao, Shirley wrote: > > > Hi, all, > > > > > > I want to use virtiofs to share folder between host and guest. > > > > > > From the guide, it must set the NUMA node. > > > https://virtio-fs.gitlab.io/howto-qemu.html > > > > > > But my guest doesn’t support NUMA. > > > > > > Is there any guide to use qemu + virtiofs without NUMA? > > > > > > Or does qemu have any plan to support it? > > > > Hi! > > > > At least on s390x, you can also specify the memory backend via the > > -machine option instead of using the -numa option, e.g.: > > > > qemu-system-s390x -machine memory-backend=mem \ > > -object memory-backend-file,id=mem,... > > > > Not sure whether that works on other architectures, too, though. > > Stefan, David, do you know? > > Right, that's the way I do it on x86. > We wrote virtiofs before the memory-backend option existed, which is why the > old docs talk about using the NUMA stuff. > > Dave > > > Thomas > > > -- > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
