Service VirtIO-FS failed to load WinFsp DLL (Status=c0000034) because WinFsp DLL is not installed

[cmigliorini]

Describe the bug
Installation of virtio-win version 0.1.266 from ISO on a vanilla Windows 10 or Windows 11 box is missing WinFSP DLL.

To Reproduce

• Install a fresh Windows 10 or 11 guest VM
• share a virtiofs folder <filesystem type="mount" accessmode="passthrough"> <driver type="virtiofs"/>
• mount virtio-win version 0.1.266 ISO
• install drivers and guest tools
• attempt to start VirtIO FS service

Expected behavior
Service should start

Screenshots

C:\Windows>"C:\Program Files\Virtio-Win\VioFS\virtiofs.exe"
The service VirtIO-FS failed to load WinFsp DLL (Status=c0000034).

Host:

• Disto: Fedora 41 KDE Plasma
• Kernel 6.13.5-200.fc41.x86_64
• QEMU version 9.1.3 (qemu-9.1.3-1.fc41)
• QEMU command line

/usr/bin/qemu-system-x86_64 \
   -name guest=win10,debug-threads=on \
   -S \
   -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-7-win10/master-key.aes"} \
   -machine pc-q35-9.1,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram,hpet=off,acpi=on \
   -accel kvm \
   -cpu host,migratable=on,hv-time=on,hv-relaxed=on,hv-vapic=on,hv-spinlocks=0x1fff,hv-vpindex=on,hv-runtime=on,hv-synic=on,hv-stimer=on,hv-frequencies=on,hv-tlbflush=on,hv-ipi=on,hv-avic=on \
   -m size=8388608k \
   -object {"qom-type":"memory-backend-memfd","id":"pc.ram","share":true,"x-use-canonical-path-for-ramblock-id":false,"size":8589934592} \
   -overcommit mem-lock=off \
   -smp 4,sockets=4,cores=1,threads=1 \
   -uuid c26239f1-a099-45d9-a6a0-270b9cfbc00e \
   -no-user-config \
   -nodefaults \
   -chardev socket,id=charmonitor,fd=28,server=on,wait=off \
   -mon chardev=charmonitor,id=monitor,mode=control \
   -rtc base=localtime,driftfix=slew \
   -global kvm-pit.lost_tick_policy=delay \
   -no-shutdown \
   -global ICH9-LPC.disable_s3=1 \
   -global ICH9-LPC.disable_s4=1 \
   -boot strict=on \
   -device {"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"} \
   -device {"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"} \
   -device {"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"} \
   -device {"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"} \
   -device {"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"} \
   -device {"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"} \
   -device {"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"} \
   -device {"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"} \
   -device {"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"} \
   -device {"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"} \
   -device {"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"} \
   -device {"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"} \
   -device {"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"} \
   -device {"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"} \
   -device {"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.2","addr":"0x0"} \
   -device {"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"} \
   -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/win10.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} \
   -blockdev {"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","driver":"qcow2","file":"libvirt-2-storage","backing":null} \
   -device {"driver":"ide-hd","bus":"ide.0","drive":"libvirt-2-format","id":"sata0-0-0","bootindex":1} \
   -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/virtio-win-0.1.266.iso","node-name":"libvirt-1-storage","read-only":true} \
   -device {"driver":"ide-cd","bus":"ide.1","drive":"libvirt-1-storage","id":"sata0-0-1"} \
   -chardev socket,id=chr-vu-fs0,path=/var/lib/libvirt/qemu/domain-7-win10/fs0-fs.sock \
   -device {"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-fs0","tag":"shares","bus":"pci.5","addr":"0x0"} \
   -netdev {"type":"tap","fd":"29","id":"hostnet0"} \
   -device {"driver":"e1000e","netdev":"hostnet0","id":"net0","mac":"52:54:00:07:93:0d","bus":"pci.1","addr":"0x0"} \
   -chardev pty,id=charserial0 \
   -device {"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0} \
   -chardev spicevmc,id=charchannel0,name=vdagent \
   -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"com.redhat.spice.0"} \
   -device {"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"} \
   -audiodev {"id":"audio1","driver":"spice"} \
   -spice port=5900,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on \
   -device {"driver":"qxl-vga","id":"video0","max_outputs":1,"ram_size":67108864,"vram_size":67108864,"vram64_size_mb":0,"vgamem_mb":16,"bus":"pcie.0","addr":"0x1"} \
   -device {"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"} \
   -device {"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"} \
   -global ICH9-LPC.noreboot=off \
   -watchdog-action reset \
   -chardev spicevmc,id=charredir0,name=usbredir \
   -device {"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"} \
   -chardev spicevmc,id=charredir1,name=usbredir \
   -device {"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"} \
   -device {"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.4","addr":"0x0"} \
   -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
   -msg timestamp=on

/usr/bin/qemu-system-x86_64 \
    -name guest=win11,debug-threads=on \
    -S \
    -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-8-win11/master-key.aes"} \
    -blockdev {"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"} \
    -blockdev {"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"} \
    -blockdev {"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/win11_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"} \
    -blockdev {"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"} \
    -machine pc-q35-9.1,usb=off,vmport=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,hpet=off,acpi=on \
    -accel kvm \
    -cpu host,migratable=on,hv-time=on,hv-relaxed=on,hv-vapic=on,hv-spinlocks=0x1fff,hv-vpindex=on,hv-runtime=on,hv-synic=on,hv-stimer=on,hv-frequencies=on,hv-tlbflush=on,hv-ipi=on,hv-avic=on \
    -global driver=cfi.pflash01,property=secure,value=on \
    -m size=8388608k \
    -object {"qom-type":"memory-backend-memfd","id":"pc.ram","share":true,"x-use-canonical-path-for-ramblock-id":false,"size":8589934592} \
    -overcommit mem-lock=off \
    -smp 4,sockets=4,cores=1,threads=1 \
    -uuid 138f94b3-6aee-41cc-9b79-37fd44d9d5c2 \
    -no-user-config \
    -nodefaults \
    -chardev socket,id=charmonitor,fd=30,server=on,wait=off \
    -mon chardev=charmonitor,id=monitor,mode=control \
    -rtc base=localtime,driftfix=slew \
    -global kvm-pit.lost_tick_policy=delay \
    -no-shutdown \
    -global ICH9-LPC.disable_s3=1 \
    -global ICH9-LPC.disable_s4=1 \
    -boot strict=on \
    -device {"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"} \
    -device {"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"} \
    -device {"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"} \
    -device {"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"} \
    -device {"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"} \
    -device {"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"} \
    -device {"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"} \
    -device {"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"} \
    -device {"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"} \
    -device {"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"} \
    -device {"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"} \
    -device {"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"} \
    -device {"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"} \
    -device {"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"} \
    -device {"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.3","addr":"0x0"} \
    -device {"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.4","addr":"0x0"} \
    -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/win11.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} \
    -blockdev {"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","driver":"qcow2","file":"libvirt-2-storage","backing":null} \
    -device {"driver":"ide-hd","bus":"ide.0","drive":"libvirt-2-format","id":"sata0-0-0","bootindex":1} \
    -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/virtio-win-0.1.266.iso","node-name":"libvirt-1-storage","read-only":true} \
    -device {"driver":"ide-cd","bus":"ide.1","drive":"libvirt-1-storage","id":"sata0-0-1"} \
    -chardev socket,id=chr-vu-fs0,path=/var/lib/libvirt/qemu/domain-8-win11/fs0-fs.sock \
    -device {"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-fs0","tag":"share","bus":"pci.1","addr":"0x0"} \
    -netdev {"type":"tap","fd":"33","id":"hostnet0"} \
    -device {"driver":"e1000e","netdev":"hostnet0","id":"net0","mac":"52:54:00:5c:5f:4b","bus":"pci.2","addr":"0x0"} \
    -chardev pty,id=charserial0 \
    -device {"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0} \
    -chardev spicevmc,id=charchannel0,name=vdagent \
    -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"com.redhat.spice.0"} \
    -chardev socket,id=chrtpm,path=/run/libvirt/qemu/swtpm/8-win11-swtpm.sock \
    -tpmdev emulator,id=tpm-tpm0,chardev=chrtpm \
    -device {"driver":"tpm-crb","tpmdev":"tpm-tpm0","id":"tpm0"} \
    -device {"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"} \
    -audiodev {"id":"audio1","driver":"spice"} \
    -spice port=5901,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on \
    -device {"driver":"qxl-vga","id":"video0","max_outputs":1,"ram_size":67108864,"vram_size":67108864,"vram64_size_mb":0,"vgamem_mb":16,"bus":"pcie.0","addr":"0x1"} \
    -device {"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"} \
    -device {"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"} \
    -global ICH9-LPC.noreboot=off \
    -watchdog-action reset \
    -chardev spicevmc,id=charredir0,name=usbredir \
    -device {"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"} \
    -chardev spicevmc,id=charredir1,name=usbredir \
    -device {"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"} \
    -device {"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.5","addr":"0x0"} \
    -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
    -msg timestamp=on

• libvirt version libvirtd (libvirt) 10.6.0
• libvirt XML file

Guest:

• Windows version 10 or 11
• virtio-win version 0.1.266

Additional context
Add any other context about the problem here.

[cmigliorini]

Installing WinFsp from https://winfsp.dev/rel/ solves the issue

[cmigliorini]

Not sure I submitted on the right repo, though