#asahi-dev on 2025-04-13 — irc logs at oftc.irclog.whitequark.org

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05:35 <nickchan> had some success hacking iboot's data abort handler hopefully i could do it for xnu soon

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09:42 <maz> alyssa: the PCIe series is 6.16 material, I expect. I'll ping Bjorn around -rc4 to make sure it hasn't got off his radar.

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10:01 <sven> nickchan: got a link to that series that i haven't picked up yet? can't seem to find it :/

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10:16 <chadmed> aaa ive written myself into a corner with the adt rust stuff. i need a mutable reference to a property to implement setprop but everything is immutable :p

10:16 <chadmed> .as_mut() on the Result doesnt work because it contains a reference which is immutable

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10:42 <nickchan> sven: https://lore.kernel.org/asahi/20250220-caches-v1-0-2c7011097768@gmail.com/T

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10:46 <nickchan> there's also https://lore.kernel.org/asahi/20250407-apple-cpmu-v6-0-ae8c2f225c1f@gmail.com/T which comes with some dts patches but nothing from the arm64 side so it continues to sit there

10:48 <sven> alright, applied the first one

10:49 <sven> the second one has to be merged through the arm64 (or whatever the correct subsystem is) tree first before i can pick up the dts changes

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11:00 <nickchan> i2c hwrev (0x28) is 6 since a12 and 3 on a11... not like the a12 part has any practical sigificance anyways

11:02 <nickchan> t2 is unknown because accessing both the i2c and related pmgr pwrstate regs in whatever state iboot puts the kernel in results in serror

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11:03 <nickchan> can probably try mapping physical memory to el0 from bridgeOS on t2 too to find out but i think it's better to hack on xnu vbar first

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12:24 <sven> https://github.com/AsahiLinux/linux/commits/b4/pasemi-fixes/ v2 of the pasemi fixes i'll send out tomorrow

12:25 <sven> let's see if i can also get smc in shape now

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12:50 <sven> huh, is the current m1n1 main hv on m1 broken for anyone else? https://gist.github.com/svenpeter42/f290098342f96c6c9d9ca35eaa6b6f02

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13:18 <jannau> sven: no issues on linux but I have seen proxy communication issues during exception handling

13:18 <jannau> I'm using raw m1n1 payloads though

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13:27 <sven> raw payload also triggers a similar exception

13:27 <sven> weird

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13:37 <sven> bisect isn't very helpful either it seems. that resulted in two different commits that made no sense and where reverting also didn't fix anything

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15:31 <sven> okay, wtf, adding more prints and iodev_console_flush to hv_enter_secondary seems to fix it

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15:31 <sven> *hv_start_secondary actually

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15:34 <sven> ah, no, i just messed up and forgot to chainload

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16:56 <sven> still no idea what causes that exception above except that it's something in the host m1n1, but smc finally works again

16:56 <sven> [ 0.354555] mfd-macsmc 23e400000.smc: RTKit: Initializing (protocol version 12)

16:56 <sven> [ 0.356430] mfd-macsmc 23e400000.smc: Initialized (922 keys #KEY (0x234b4559) .. zETM (0x7a45544d))

16:56 <sven> [ 0.358617] macsmc-gpio macsmc-gpio: First GPIO key: gP01 (0x67503031)

17:02 <sven> ugh, wait, did i break the binary search for the first gpio key? shouldn't that be gP00?

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17:07 <sven> nope, looks like gP01 is correct

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17:13 <LarstiQ> 1-based indexing? What is this, matlab? ;)

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19:43 <sven> tried to track down that weird exception some more, it seems to somehow jump to a weird PC sometime after reaching smp_secondary_entry

19:44 <sven> this smells like weird memory corruption or something like that to me but i can't figure out what causes it

19:44 <sven> the last few times it does the weird jump somewhere in mmu_secondary_setup but before reaching smp_secondary_entry again

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19:47 <jannau> can you upload the m1n1+payload?

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19:54 <sven> see /msg

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19:54 <sven> the m1n1 has one patch that might annoying for you, i've hardcoded the serial_str to dummy_serial_str because my m1n1 bootobject still has that old code

20:00 <jannau> the binary fails for on macho parsing: https://paste.debian.net/1369328/

20:01 <sven> it's a raw binary, i switched to that to rule out macho issues

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20:05 <jannau> does the execption happens before trying to mount the rootfs? it boots until that here

20:05 <sven> oh, duh, this won't crash for you: the issue is somewhere in the host m1n1

20:09 <sven> https://f.svpe.dev/m1n1.bin that's the host one that almost always crashes when running run_guest.py for me

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20:15 <jannau> that reproduces

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20:17 <sven> it seems to break when returning from mmu_secondary_setup to smp_secondary_entry

20:17 <sven> so something somehow seems to corrupt lr there

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20:22 <jannau> looks that way. does always break at starting cpu 2?

20:23 <sven> i think so, but i didn't pay close attention

20:23 <sven> let me try a few time

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20:24 <sven> nope, just crashed when trying to start cpu 1

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