Virtiofs

https://virtio-fs.gitlab.io/
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Virtiofs is a shared file system that enables virtual machines to securely access host directories...
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### Launch QEMU with virtiofs

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Full command to start a QEMU instance with virtiofs enabled.

```bash
   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/vhostqemu -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=rootfsimage.qcow2
```

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### Start the virtiofs service

Source: https://virtio-fs.gitlab.io/howto-windows.html

Execute this command in an administrator Command Prompt to start the registered virtiofs service.

```cmd
C:\> sc start VirtioFsSvc
```

--------------------------------

### Build and install Linux kernel

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Standard build and installation commands for the kernel.

```bash
      make -j 8 && make -j 8 modules && make -j 8 modules_install && make -j 8 install
```

--------------------------------

### Start the virtiofs daemon

Source: https://virtio-fs.gitlab.io/howto-boot.html

Launch the virtiofsd daemon to share the root file system directory with the guest.

```bash
# virtiofsd --socket-path=/tmp/vhostqemu -o source=virtio-fs-root -o cache=none
```

--------------------------------

### Start virtiofsd daemon

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Launch the virtiofsd daemon with the specified socket path and source directory.

```bash
        /usr/libexec/virtiofsd --socket-path=/tmp/vhostqemu -o source=$TESTDIR -o cache=always
```

--------------------------------

### Build QEMU

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Configure and compile QEMU from source.

```bash
        ../configure --prefix=$PWD --target-list=x86_64-softmmu
        make -j 8
```

--------------------------------

### Clone QEMU source

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Download the QEMU source repository.

```bash
      git clone https://gitlab.com/qemu-project/qemu.git
```

--------------------------------

### Enable DAX in QEMU and guest

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Configuration for enabling DAX mode in QEMU and mounting with DAX support in the guest.

```bash
     -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs,cache-size=2G
```

```bash
   mount -t virtiofs myfs /mnt -o dax
```

--------------------------------

### Set QEMU kernel parameters

Source: https://virtio-fs.gitlab.io/howto-boot.html

Define the root file system type and mount parameters for the guest kernel.

```bash
-append "rootfstype=virtiofs root=myfs rw"
```

--------------------------------

### Create a Fedora root file system

Source: https://virtio-fs.gitlab.io/howto-boot.html

Commands to initialize a directory as a root file system using dnf.

```bash
# mkdir virtio-fs-root
# dnf --installroot=$PWD/virtio-fs-root --releasever=29 install system-release vim-minimal systemd passwd dnf rootfiles
# $EDITOR virtio-fs-root/etc/shadow # set password or allow password-less root login
```

--------------------------------

### Register the virtiofs service

Source: https://virtio-fs.gitlab.io/howto-windows.html

Execute this command in an administrator Command Prompt to register the virtiofs service for automatic startup.

```cmd
C:\> sc.exe create VirtioFsSvc binpath="(your binary location)\virtiofs.exe" start=auto depend="WinFsp.Launcher/VirtioFsDrv" DisplayName="Virtio FS Service"
```

--------------------------------

### Configure QEMU kernel path

Source: https://virtio-fs.gitlab.io/howto-boot.html

Specify the location of the guest kernel image for QEMU.

```bash
-kernel path/to/bzImage
```

--------------------------------

### Mount virtiofs in guest

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Command to mount the virtiofs filesystem inside the guest VM.

```bash
   mount -t virtiofs myfs /mnt
```

--------------------------------

### Configure Linux kernel for virtiofs

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Required configuration options for the guest kernel.

```text
      CONFIG_VIRTIO_FS
      CONFIG_FUSE_DAX   # optional
```

--------------------------------

### QEMU device configuration flags

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Individual QEMU command line flags for setting up the virtiofs communication channel and memory backend.

```bash
      -chardev socket,id=char0,path=/tmp/vhostqemu
```

```bash
      -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs
```

```bash
      -m 4G -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa node,memdev=mem
```

--------------------------------

### Clone Linux kernel source

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Download the Linux kernel source code for guest configuration.

```bash
      git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
```

--------------------------------

### Build virtiofsd

Source: https://virtio-fs.gitlab.io/howto-qemu.html

Build the virtiofs daemon using Rust's cargo.

```bash
        git clone https://gitlab.com/virtio-fs/virtiofsd.git
        cd virtiofsd
        cargo build --release
```
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