[Bug 207447] Add hw.pci.honor_msi_blacklist=0 to GCE images

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Feb 23 21:39:34 UTC 2016


            Bug ID: 207447
           Summary: Add hw.pci.honor_msi_blacklist=0 to GCE images
           Product: Base System
           Version: 10.3-BETA2
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wac at google.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Due to the way Google Compute Engine currently populates the virtual PCI bus it
presents to VMs, sys/dev/pci/pci.c's pci_msi_blacklisted() blocks use of MSI.
Since there is no 0:0:0 bridge device the existing workarounds there, such as
the one for qemu, won't work.

Adding hw.pci.honor_msi_blacklist=0 to /boot/loader.conf on the images intended
for Google Compute Engine will allow use of MSI, which is supported by the

Efforts are underway to make this unnecessary, but are unlikely to be complete
before 10.3-RELEASE.

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