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dc79852af8
This patch was made in response to: https://bugzilla.redhat.com/show_bug.cgi?id=738095 In short, qemu's default for the rombar setting (which makes the firmware ROM of a PCI device visible/not on the guest) was previously 0 (not visible), but they recently changed the default to 1 (visible). Unfortunately, there are some PCI devices that fail in the guest when rombar is 1, so the setting must be exposed in libvirt to prevent a regression in behavior (it will still require explicitly setting <rom bar='off'/> in the guest XML). rombar is forced on/off by adding: <rom bar='on|off'/> inside a <hostdev> element that defines a PCI device. It is currently ignored for all other types of devices. At the moment there is no clean method to determine whether or not the rombar option is supported by QEMU - this patch uses the advice of a QEMU developer to assume support for qemu-0.12+. There is currently a patch in the works to put this information in the output of "qemu-kvm -device pci-assign,?", but of course if we switch to keying off that, we would lose support for setting rombar on all the versions of qemu between 0.12 and whatever version gets that patch.
30 lines
825 B
XML
30 lines
825 B
XML
<domain type='qemu'>
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<name>QEMUGuest2</name>
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<uuid>c7a5fdbd-edaf-9466-926a-d65c16db1809</uuid>
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<memory>219100</memory>
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<currentMemory>219100</currentMemory>
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<vcpu>1</vcpu>
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<os>
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<type arch='i686' machine='pc'>hvm</type>
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<boot dev='hd'/>
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</os>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<emulator>/usr/bin/qemu</emulator>
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<disk type='block' device='disk'>
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<source dev='/dev/HostVG/QEMUGuest2'/>
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<target dev='hda' bus='ide'/>
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</disk>
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<hostdev mode='subsystem' type='pci' managed='yes'>
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<source>
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<address domain='0x0000' bus='0x06' slot='0x12' function='0x5'/>
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</source>
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<rom bar='off'/>
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</hostdev>
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<memballoon model='virtio'/>
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</devices>
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</domain>
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