ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | Non-development talk: #asahi | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev
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<nickchan>
for the interest of having apfs in the kernel would it be safe to assume every asahi linux user would be using it eventually as part of using the SEP's xART gigalocker file? that usecase be sufficiently common
<nickchan>
now granted that is an usecase that only uses a small part of the filesystem code
<nickchan>
But maybe that entirely falls in what should be handled by fuse not sure
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<nickchan>
the gigalocker file probably isn't much of an io burden
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<j`ey>
hard to know how many people from stats.asahi would actually want this
<sven>
what might be interesting for users is that apple container(?) feature where they could have a volume for macos and one for linux that share the available space. not sure if the apfs driver supports this or if that's even something users want
<sven>
the gigalocker thing we can also hack: figure out the offset of the file from m1n1 inside that disk image and then just use raw disk r/w to modify it
<j`ey>
is the gigalocker stuff used at SEP runtime, or would it just be m1n1?
<sven>
runtime
<sven>
but it's stored contiguously on the disk
<sven>
so we can kinda bypass all the apfs crap once we know where it is
<j`ey>
and SEP driver would use some block(?) APIs in the kernel directly?
<sven>
the access would happen from asahi-sepd from userspace anyway
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<nickchan>
sven: volumes in a container share space (though optional fixed allocations could be made) . To tell which volume is for which OS there are "volume groups"
<j`ey>
sven: oh ok
<sven>
j`ey: so, uh, open(/dev/nvme0ns0p3) and then just read/write essentially
<nickchan>
and then an OS may need multiple volumes for different purposes and that's what the volume role is for
<sven>
gigalocker is a key/value store and SEP just requests reads/write from there through its protocol
<sven>
so unless we want to parse that protocol in kernel space which doesn't seem like a good idea it's all userspace access
<nickchan>
i don't think kernel space access is really needed unless one wants to access SEP encrypted apfs from the kernel which no linux driver can do right now even for normal encryption
<j`ey>
but it sounds like AFPS driver wouldnt help for the SEP use case then
<sven>
it would just make it a bit more convenient and less hacky
<j`ey>
but a big burden, code wise
<sven>
yup
<sven>
but as long as we don't have to maintain it ;P
<nickchan>
linux-apfs-rw maintainer does has an incentive to maintain it since it's corellium code and that guy works at corellium
<nickchan>
probably safe to assume that corellium interanlly uses that module for something too so there's commerical interest
<sven>
let me put it differently: I don't care much about apfs support in the kernel honestly but I'm also not going to complain if someone else manages to get it upstream
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<sven>
looks like smc will be merged after -rc1 🥳
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<alyssa>
sven: FUSE sounds like the sanest for SEP no?
<sven>
probably
<sven>
is there a apfs-fuse driver? we'll have to test that one very well so make sure it doesn't corrupt that xARTs partition in any way
<sven>
because if it does you lose access to e.g. all encrypted data on the macos volumes