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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<klaus_>
≤
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<jeffmiw>
I'm trying to see how to setup m1n1 as an EL2 hypervisor, from my understanding we shall set HCR_EL2.E2H(Bit 34) to zero for that, I have been trying to change this first with a proxy shell, then in exception_initialize but for some reason it does work
<jeffmiw>
this bit stays at 1
<jeffmiw>
there must be a pre-condition to be able to change it but I did not find it. If anyone has an idead on where to dig ?
<jeffmiw>
j`ey: thanks ... need to rethink my understanding for having m1n1 as an hypervisor ...
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<kettenis_>
yay, I have a m1n1/u-boot combo that doesn't need the tunables
<marcan>
\o/
<marcan>
awesome!
<marcan>
jeffmiw: m1n1 can already be a "hypervisor", you can boot m1n1 as a "guest" with chainload.py --el1
<marcan>
and then boot linux under that (only works in single-cpu mode because there's no real virtualization of the SMP spinup stuff, so the other cores come up in EL2 and that breaks)
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<marcan>
it doesn't actually hypervise anything yet though, making it do that is the next step :)
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<jn__>
mm1otrace will be fun :)
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<jeffmiw>
marcan: I did play a bit with chainload.py --el1, still, I'm trying to make a small step to hypervise something
<jeffmiw>
I was thinking to have m1n1 keeping the usb interface (I do not have the serial interface stuff, only usb) and then boot linux and virtualize the uart to do somekind of mmio tracing
<jeffmiw>
once I have that, I was thinking to do the same with macos, so we can trace registers to help reverse eng without having to disassemble and risking copyright infringement
<jeffmiw>
and I was on the plan to use the HCR_EL2.E2H to have type 1 like virtualization for that
<jeffmiw>
but then I got stuck on this sticky HCR_EL2.E2H bit ...
<jeffmiw>
now I'm rethinking the appraoch with E2H set to 1 , looking at the memory map to try to do this basic mmiotrace experiment
<marcan>
jeffmiw: you're describing what I've been planning on doing all along :p
<roxfan>
well, you aren't doing it yet so...
<marcan>
I was going to start on monday!
<roxfan>
too late!
<marcan>
kettenis_: merged :p
<marcan>
roxfan: come on, I finally did my taxes today, I need to avoid getting deported first :p
<roxfan>
congrats
<jeffmiw>
marcan: yes this is what I understood and found so powerful, i decided to try to give it a try
<jeffmiw>
don't worry I'm still catching up with all the work you have done, it took me hours to understand the armv8 virtualization stuff on top of the page tables :)
<jeffmiw>
just understanding m1n1 memory.c took me hours/days :) (not full time but still :) )
<jeffmiw>
so before I have something you will have done in a couple of hours :)
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<marcan>
I have a fairly well cooked idea in my head, just don't want to end up overlapping and ending up with wasted time :)
<marcan>
but yeah, you don't care about E2H=1. it just means EL2 can pretend to be EL1.
<marcan>
the setup that --el1 does is correct, you just need to enable the second-stage page tables (VM mode) like you would with E2H=0
<sven>
hah, looks like kettenis_ has some way of making marcan actually look at my PRs :P
<marcan>
sven: speaking of, what's the state of the USB one?
<marcan>
I actually have a draft review on that one fwiw :p
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<kettenis_>
marcan: thanks
<sven>
not much changes for the usb one fwiw, i've just split the dart and pmgr stuff out because kettenis_ needed the first and i had updates for the second
<marcan>
but also, eh, whatever *click*
<marcan>
there's your amazing review :p
<sven>
hahaha :D
<marcan>
(honestly, I don't really care too much about details with m1n1; anything broken we can fix, as long as the basic approach is fine)
<marcan>
(e.g. your framebuffer scrolling thing is definitely weird enough to get complaints; stuff like this is fine :p)
<sven>
heh, yeah. that framebuffer thing was somewhat strange
<sven>
no idea what me go into that direction when the new one is so much simpler
<sven>
you should probably do a closer review of the usb one though. that one's more critical
<marcan>
yeah, definitely
<marcan>
will review the FB stuff tomorrow too, but go over the diff a bit, there's at least one random blank line added and also some of the fix commits could use squashing
<marcan>
I expect to do some munging over the blue between fb / usb / serial / proxy after this is all merged anyway, it needs a rethink
<marcan>
which is fine as long as the underlying primitives are OK for each bit
<sven>
sure
<marcan>
*glue
<jeffmiw>
marcan: yes working to do some VM memory map and trying it, looking at VTCR_EL2 and VTTBR_EL2 before turning on HCR_EL2.VM to 1
<kettenis_>
for framebuffer scrolling trying to avoid reading back the framebuffer contents is typically a good idea
<kettenis_>
a trick that is often used is to use a shadow framebuffer
<marcan>
we map it as normal memory, so there is no difference
<marcan>
the display hardware is cache coherent as far as I can tell
<kettenis_>
ah, yes, that helps
<marcan>
sven: this reminds me, on paper we prooobably need to unmap some high RAM at some point, need to figure out what the sane way of determining what the hole is
<marcan>
because right now the CPU is allowed to speculate into a carveout there that blows up IIRC
<marcan>
that's probably going to annoy us when we least expect it
<sven>
oh, the sep carveout area?
<marcan>
yeah, I think it's up there? I know the highest part of RAM faults anyway
<sven>
hm, true. i do remember hitting something before the end of ram once after chainload m1n1 too often
<sven>
*chianloading
<marcan>
wow, you actually ran out of RAM?
<marcan>
amazing
<marcan>
I've never managed that :D
<sven>
only once :d
<sven>
when working on the usb code trying to track down some heisenbug
<marcan>
heh
<marcan>
I always crash it before that happens
<marcan>
(and reboot takes 7 seconds so whatever)
<sven>
yeah, that's usually what happens to me as well
<marcan>
still need to make chainload do in-place updates somehow
<sven>
i think it was a missing dma barrier so the bug only happened *sometimes*
<marcan>
though that's only going to work after the first chainload, properly at least
<marcan>
due to memory layout
<sven>
so i was just spamming chainload over and over again to trigger it
<marcan>
heh
<marcan>
but then again all this ties in with the xnu loading stuff for mmiotrace, I need to just write code that can rebuild the adt/bootargs/stuff anyway
<marcan>
which will allow "proper" in-place chainloads
<kettenis_>
coding-style wise, is it something exitstng (in emacs) you're using?
<marcan>
for C? we have the clang-format thing, just run "make format"
<marcan>
there's no formal coding style other than the rules in that .clang-format file (which I update sometimes) and basically following the style of the rest of the code
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<marcan>
I do enforce the clang-format thing, even when it does the "wrong" thing it's better to leave the formatting to a tool than agonize over doing things manually
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<marcan>
there's a github workflow that should do a clang-format check on all PRs
<kettenis_>
hmm, the llvm package is missing from the last OpenBSD arm64 package snapshot
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<sven>
i think the CI workflow should also just give you a diff to make clang-format happy otherwise
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