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Role(master or peer) controls how the domain behaves on migration. For more details about migration with ivshmem, see https://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/system/ivshmem.rst;hb=HEAD It's a optional attribute in libvirt, and qemu will choose default role for ivshmem device if the user is not specified. With device property 'role', the value can be 'master' or 'peer'. - 'master' (means 'master=on' in qemu), the guest will copy the shared memory on migration to the destination host. - 'peer' (means 'master=off' in qemu), the migration is disabled. Signed-off-by: Martin Kletzander <mkletzan@redhat.com> Signed-off-by: Yang Hang <yanghang44@huawei.com> Signed-off-by: Wang Xin <wangxinxin.wang@huawei.com> Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
59 lines
1.7 KiB
XML
59 lines
1.7 KiB
XML
<domain type='qemu'>
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<name>QEMUGuest1</name>
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<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
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<memory unit='KiB'>219136</memory>
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<currentMemory unit='KiB'>219136</currentMemory>
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<vcpu placement='static'>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-system-i386</emulator>
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<controller type='usb' index='0'/>
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<controller type='pci' index='0' model='pci-root'/>
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<input type='mouse' bus='ps2'/>
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<input type='keyboard' bus='ps2'/>
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<memballoon model='none'/>
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<shmem name='shmem0'>
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<model type='ivshmem-plain'/>
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</shmem>
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<shmem name='shmem1' role='peer'>
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<model type='ivshmem-plain'/>
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<size unit='M'>128</size>
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</shmem>
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<shmem name='shmem2' role='master'>
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<model type='ivshmem-plain'/>
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<size unit='M'>256</size>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
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</shmem>
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<shmem name='shmem3'>
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<model type='ivshmem-doorbell'/>
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<server/>
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</shmem>
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<shmem name='shmem4'>
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<model type='ivshmem-doorbell'/>
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<server path='/tmp/shmem4-sock'/>
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</shmem>
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<shmem name='shmem5'>
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<model type='ivshmem-doorbell'/>
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<server path='/tmp/shmem5-sock'/>
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<msi ioeventfd='off'/>
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</shmem>
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<shmem name='shmem6'>
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<model type='ivshmem-doorbell'/>
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<server path='/tmp/shmem6-sock'/>
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<msi vectors='16'/>
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</shmem>
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<shmem name='shmem7'>
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<model type='ivshmem-doorbell'/>
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<server path='/tmp/shmem7-sock'/>
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<msi vectors='32' ioeventfd='on'/>
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</shmem>
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</devices>
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</domain>
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