Hypervisor in 1k Lines

https://1000hv.seiya.me/en

129•lioeters•5mo ago

Comments

nighthawk454•5mo ago

Also discussed at:

https://news.ycombinator.com/item?id=45070019

userbinator•5mo ago

See also https://ionescu007.github.io/SimpleVisor/ in around 500 lines of C.

notorandit•5mo ago

That's not risc-v, though.

notorandit•4mo ago

Why demoting? It Is x86-64 only!

chubot•5mo ago

Hm I would like to see this in C rather than Rust. And I wonder if you can run the 1000 line OS in C along with the 1000 line hypervisor

It would be nice to see a demo!

LiamPowell•5mo ago

How do you define an OS? You can write an EFI "OS" that prints "Hello, world" in approximately 5 lines.

spongebobism•5mo ago

It's a bit more than that.

> We'll implement basic context switching, paging, user mode, a command-line shell, a disk device driver, and file read/write operations in C.

see https://1000os.seiya.me/en/

dark-star•4mo ago

that's not an OS, that's an EFI application

courtcircuits•5mo ago

This repo seems to handle VM exits and memory initialization : https://github.com/soulxu/kvmsample/blob/master/main.c

I'd say it's a good place to start !

arghwhat•4mo ago

This is a cool intro to how virtualization instructions work, but people need to understand that it is not revolutionary simplicity or anything like that. It's just a a cool tech demo lacking all the important bits of a modern hypervisor required to make it practical, like paravirtualized drivers for example.

Same when someone claims to have written an OS in 1000 lines and all it does is get you to real mode with VGA graphics and an interactive (but useless) prompt.

(Note that you can benefit from virtualization technology in specialized scenarios outside common hypervisors, but that's not really what's being demoed here.)

ge96•4mo ago

Any thoughts on OsakaOS

arghwhat•4mo ago

That it's fine to do things just to have fun an mess around, but thats all there is to it. It's not even an OS at the current state.

Other small OS's are actually OS's and can be impressive efforts. Sometimes they bring new concepts or paradigms, but that itself is rarely more than a curiosity without impact. Still fun though, at the very least for the authors.

giveita•4mo ago

Why does it need qemu? Isn't it a qemu?

ahakki•4mo ago

I guess because it's a risc-v hypervisor and the author expects you to run it on an x86 machine.

giveita•4mo ago

Thanks. Good use of a turtle. (Turtles all the way down)

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