https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254956
Bug ID: 254956
Summary: Assertion fails when passing-through PCI device with
large memory BAR
Product: Base System
Version: 13.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bhyve
Assignee: virtualizat...@freebsd.org
Reporter: crows...@protonmail.com
Passing-through a PCI device with a large BAR (for instance, a GPU) fails when
the 0xfff... probe address is assigned to the BAR: bhyve exists with an
assertion failed such as
Assertion failed: (error == 0), function modify_bar_registration, file
/usr/src/usr.sbin/bhyve/pci_emul.c, line 501.
During boot the system assigns the BAR a temporary address such that addr +
size = 0xffffffff. It immediately restores the previous address. This is not a
problem for most PCI devices. However, when passing through a GPU, the
temporary memory region is large enough to occupy space already taken by the
high performance time counter. This causes the assertion to fail at run time.
I propose that when a probing address such as this is assigned to the BAR, we
do not attempt to intercept it at all. My proposal is here:
https://reviews.freebsd.org/D29698
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