[Bug 211117] dma_mmap_coherent() - garbage sound output with mem_encrypt on Ryzen platform

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https://bugzilla.kernel.org/show_bug.cgi?id=211117

--- Comment #18 from Triton Circonflexe (triton+enkelr@xxxxxxxxxx) ---
Tested with iommu=pt (and no mem_encrypt option, so "on" by default): still
white noise.

Regarding the encryption, I don't really have a _need_ for that. If I use it,
it's in part because Virtualbox seems to require it in some use cases (not even
entirely sure about that) and mostly because it's activated by default (and I
like default settings to work correctly).
I checked the BIOS anyway but did not find any TSME or similar option (thanks
for the information, though).

Right now, I'm working with mem_encrypt=off and I can do everything I need for
now (no vbox for the moment).
I will continue to follow this bug because I can reproduce the problem easily
and do tests if required.

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