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<
alyssa>
poking at sparse again
<
alyssa>
did an abominatio to dump apple-generated page tables
<
alyssa>
the format is basically what I got from black box
<
alyssa>
apple also sets bit 30. not sure what that does
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<
alyssa>
but that doesn't help, something is going wrong on linux before we even get that far
<
alyssa>
so.. i'm kind of stuck now tbh
<
alyssa>
my PBE descriptors look identical
<
alyssa>
clearly i'm doing
*something* wrong..
<
alyssa>
this is bizarre! it's not even making an attempt to read my page table
<
alyssa>
it's not that i can't workaround it, it's that this is clearly intended to work and doesn't :/
<
alyssa>
ooh but if I run a whole bunch of tests in sequence it tries to read it. wtf?
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<
alyssa>
block writes are attempting to read my page table, pixel writes aren't
<
alyssa>
ok so maybe sparse + block writes are working fine
<
alyssa>
and it's just non-block writes that no
<
alyssa>
wait here's a no block
<
alyssa>
oh this is.... deeply questionable. seemingly it's accessing page tables one page before where I tell it. hahah wtf
<
alyssa>
umm... here it's derefing 4 pages before despite a pt size of 1 page... uhhh
<
alyssa>
perhaps this has the answers I seek..
<
alyssa>
maybe not :-/
* alyssa
should probably verify this works at all on macOS
<
alyssa>
i think that's probably time to call it a day
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