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Subject: [Bug 207447] Add hw.pci.honor_msi_blacklist=0 to GCE images
Date: Tue, 23 Feb 2016 21:39:34 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: misc
X-Bugzilla-Version: 10.3-BETA2
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X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: wac@google.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207447

            Bug ID: 207447
           Summary: Add hw.pci.honor_msi_blacklist=3D0 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@FreeBSD.org
          Reporter: wac@google.com
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

Due to the way Google Compute Engine currently populates the virtual PCI bu=
s it
presents to VMs, sys/dev/pci/pci.c's pci_msi_blacklisted() blocks use of MS=
I.
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=3D0 to /boot/loader.conf on the images in=
tended
for Google Compute Engine will allow use of MSI, which is supported by the
platform.

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

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