[Bug 250802] bhyve exited with status 134 when GPU PCI passthrough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250802

--- Comment #32 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to mr.xanto from comment #31)
Ok, my prolonged confusion comes from the fact that bhyvectl --get-all reports
EPT violation vmexit.  While your bhyve instance actually tries to handle
instruction emulation exit, and emulation assist requires access to the
membar.

So I restored the initial patch, that seems to do the right thing after all.
https://reviews.freebsd.org/D27138

Please apply both D27095 and D27138 and see if it helps.

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