QEMU VS osxfuse

My most-wanted QEMU feature: https://github.com/qemu/qemu/commit/a2260983c6553

Using `gic-version=3` on macOS you can now use more than 8 cores on ARM chips.

A better solution is just to write a plain ass shell script that tests if various C snippets compile.

https://github.com/oilshell/oil/blob/master/configure

https://github.com/oilshell/oil/blob/master/build/detect-pwe...

Not an unholy mix of m4, shell, and C, all in the same file.

---

These are the same style as a the configure scripts that Fabrice Bellard wrote for tcc and QEMU.

They are plain ass shell scripts, because he actually understands the code he writes.

https://github.com/qemu/qemu/blob/master/configure

https://github.com/TinyCC/tinycc/blob/mob/configure

OCaml’s configure script is also “normal”.

You don’t have to copy and paste thousands of lines of GNU stuff that you don’t understand.

(copy of lobste.rs comment)

Related:

A fast Pascal (Delphi) WebAssembly interpreter:

https://github.com/marat1961/wasm

WASM-4:

https://github.com/aduros/wasm4

Curated list of awesome things regarding WebAssembly (wasm) ecosystem:

https://github.com/mbasso/awesome-wasm

Also, it would be nice if there was a WASM (soft) CPU for QEMU, which (if it existed!) would go here:

https://github.com/qemu/qemu/tree/master/target

> architectural registers are always updated

In tiny code, the guest registers (global TCG variables) are stored in the host's registers until you either call an helper which can access the CPU state or you return (`git grep la_global_sync`). This is the reason why QEMU is not so terribly slow.

But after a check, this also happens when you access the guest memory address space! https://github.com/qemu/qemu/blob/master/include/tcg/tcg-opc... (TCG_OPF_SIDE_EFFECTS is what matters)

But still, in the end, it's the same problem. What QEMU does, can be done in LLVM too. You could probably be more efficient in LLVM by using the exception handling mechanism (invoke and friends) to only serialize back to memory when there's an actual exception, at the cost of higher register pressure. More or less what we do here: https://rev.ng/downloads/bar-2019-paper.pdf

Um, in case you don't know, UTM (based on QEMU) is out for quite a while.

Some of these tools include Oracle VM VirtualBox (that I've used since before the acquisition of Sun Microsystems by Oracle), VMWare Workstation Player, and QEMU, but last year, I found out about Multipass.

For C/C++ projects that use meson as the build system, there is an excellent way to manage dependencies:

https://mesonbuild.com/Wrapdb-projects.html

https://mesonbuild.com/Wrap-dependency-system-manual.html

meson will download and build the libraries automatically and give you a variable which you pass as a regular dependency into the built target:

https://github.com/qemu/qemu/tree/005ad32358f12fe9313a4a0191...

https://github.com/harfbuzz/harfbuzz/tree/main/subprojects

https://github.com/harfbuzz/harfbuzz/blob/37457412b3212463c5...

Or, if you're using proper operating systems, they're managed by the usual package manager, just like everything else.

For all the users of the Linux platform, QEMU is the VM that you should go for. This software comes without any price tag and works as an emulator of various machines with utmost ease and completion; the software uses dynamic translations to emulate hardware peripherals and enhances its overall performance. If you are using QEMU as a virtualizer, then it will function exactly like the host system (provided you have the right set of hardware).

In this tutorial, we set up macOS and Windows virtual machines on UTM, a macOS application that provides a GUI wrapper for QEMU, a powerful open-source emulator and virtualizer. UTM allows you to easily manage and run virtual machines without memorizing complex commands. It also has special handling for macOS, making it simpler to install compared to other virtual machine software.

Install macFUSE, thank me later: https://osxfuse.github.io

I didn't exactly use any 'tutorial'. Assumming you can already SSH to the target machine, you just need to install both these pkgs then reboot to 1TR Recovery Mode and choosing Reduced Security and choose to enable Kernel Extension and then reboot again goto Security & Privacy and Allow the extension, and that's it you can now use it.

Yeah, FUSE is Linux only. But for completeness, for macs there is macFUSE, and for Windows there is winfsp. Both of these have fewer filesystems than FUSE, and I've used neither so I don't know how well they work.

https://github.com/osxfuse/osxfuse/wiki/List-of-macFUSE-File...

https://winfsp.dev/doc/Known-File-Systems/

Weird. Where did you download (lat/new)est MacFuse from? https://osxfuse.github.io/ I hope!

I lead a project that included shipping a filesystem driver and a virtual disk on Windows.

What I did to learn the lower-level APIs, and perform initial testing on the driver, was write a "mirror" drive. The user-mode code pointed to a folder on disk, the driver made a virtual disk drive, and all reads and writes in the virtual disk drive went to the mirror folder.

On Windows, you can implement something like that using Dokany, Dokan, or Winfsp. On linux, there's the Fuse API. On Mac, there's MacFUSE.

Even if you don't do a "mirror" drive, understanding the callbacks that libraries like Dokany, Dokan, Winfsp, and Fuse do helps you understand how IO happens in the driver. Many IO methods provided in popular languages provide abstractions above what the OS does. (For example, the Windows kernel has no concept of the "Stream" that's in your C# program. The "Stream"'s Position property is purely a construct within the .Net framework.)

https://dokan-dev.github.io/

https://github.com/dokan-dev/dokany

https://osxfuse.github.io/

Another place to start is the OS's documentation itself. For example, you can start with Window's CreateFileA function. This typically is what gets called "under the hood" in most programming languages when you open or create a file: https://learn.microsoft.com/en-us/windows/win32/api/fileapi/...

"FUSE-T is a kext-less implementation of FUSE for macOS that uses NFS v4 local server instead of a kernel extension. The main motivation for this project is to replace macfuse (https://osxfuse.github.io/) that implements its own kext to make fuse work. With each version of macOS it's getting harder and harder to load kernel extensions. Apple strongly discourages it and, for this reason, software distributions that include macfuse are very difficult to install. Additionally, the macfuse kext is unstable, may cause frequent system crashes and kernel lock-ups. Given those limitations many software publishers are unable to use macfuse anymore. FUSE-T doesn't make use of kernel extension, it implements its own userspace server that converts between FUSE protocol and NFS calls and let macOS mount NFS volume instead of a kernel filesystem."

MacFuse (ntfs-3g) and a Foolproof way of getting it working via Homebrew.

macos doesn’t support many Linux file system formats. You’ll have to use something like macFUSE https://osxfuse.github.io/