[Bug 285415] [Hyper-V] i386 panic during vm_phys_early_startup()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285415

--- Comment #9 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Dimitry Andric from comment #8)
Here the assertion seems to be complaining about the bounce buffer length not
being a multiple of the page size.  The assertions in storvsc_xferbuf_prepare()
are disabled on arm64 in commits 6f7b1310b6fe3 and 0af5a0cd2788e with no real
explanation given, so I somewhat suspect that the crash is unrelated.

(Actually I am not sure how busdma can be forced to make each segment a
multiple of the page size, but this certainly appears to be a requirement of
the driver, since the callback does not store the segment length anywhere...)

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