marcan changed the topic of #asahi to: Asahi Linux: porting Linux to Apple Silicon macs | General project discussion | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Topics: #asahi-dev #asahi-re #asahi-gpu #asahi-offtopic | Keep things on topic | Logs: https://alx.sh/l/asahi
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<marcan> wasn't expecting the *progress report* to end up on El Reg of all things
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<jeffmiw> marcan: Thanks a lot for the monthly report, really great read, very helpful to catch-up/follow, and helpful with all the links !
<jeffmiw> I like the idea of booting macos with m1n1 as an hypervisor, sounds like fun and very useful to optimize the linux port
<tpw_rules> marcan: fun fact about HLT on windows 95: microsoft could have done it, but some hardware was buggy and it locked the machine up: https://devblogs.microsoft.com/oldnewthing/20030828-00/?p=42753
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<jeffmiw> what would be the starting point for such a thin VM hypervisor in m1n1 ?
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<arnd> jeffmiw: all the cool kids these days build on top of rustvmm
<jeffmiw> ok, thanks arnd
<bpye> Presumably the m1n1 hypervisor wouldn't really need much of a VMM stack, it'd mostly be passthrough with the ability to log reads/writes to certain MMIO ranges and possibly inject them?
<bpye> I guess if you wanted to provide a thin hypervisor to make M1 look like a more normal device (emulating SBSA I guess?) then maybe your thinking is different.
<pipcet[m]> so the idea would be to run macOS and letting it believe it was directly on hardware, but to intercept MMIO and MSR accesses and log them? what would we do about unknown instructions?
<jeffmiw> agree with bpye, rustvmm seems to be a VM Monitor, not really a thin hypervisor, not sure this is what we need for m1n1
<jeffmiw> I see a thin hypervisor like a layer that will control the hw if needed to stop, dump memory, decide memory allocation, could intercept interrupts, ..
<jeffmiw> I was more thinking about things like xen or kvm for instance
<arnd> jeffmiw: right, rustvmm is a set of library that can do different parts of the whole solution, but I suppose the part you need most is probably one that is not there
<arnd> Stefano Stabellini has done some interesting work on trimming down Xen to the point where it mainly does static partitioning and is overall very small, see https://xenproject.org/2019/12/16/true-static-partitioning-with-xen-dom0-less/ for an older talk from him
<jeffmiw> trimmed down xen could be interesting
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