Hypervisor in 1k Lines(1000hv.seiya.me)

129 pointsby lioeters5 months ago7 comments

arghwhat5 months 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.)
- ge965 months ago
  Any thoughts on OsakaOS
  - arghwhat5 months 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.
nighthawk4545 months ago
Also discussed at:
https://news.ycombinator.com/item?id=45070019
userbinator5 months ago
See also https://ionescu007.github.io/SimpleVisor/ in around 500 lines of C.
- notorandit5 months ago
  That's not risc-v, though.
  - notorandit5 months ago
    Why demoting? It Is x86-64 only!
chubot5 months 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!
- courtcircuits5 months 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 !
- LiamPowell5 months ago
  How do you define an OS? You can write an EFI "OS" that prints "Hello, world" in approximately 5 lines.
  - spongebobism5 months 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-star5 months ago
    that's not an OS, that's an EFI application
giveita5 months ago
Why does it need qemu? Isn't it a qemu?
- ahakki5 months ago
  I guess because it's a risc-v hypervisor and the author expects you to run it on an x86 machine.
  - giveita5 months ago
    Thanks. Good use of a turtle. (Turtles all the way down)
curtisszmania5 months ago
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TacticalCoder5 months ago
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