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e1b022890e
There is this class of PCI devices that act like disks: NVMe.
Therefore, they are both PCI devices and disks. While we already
have <hostdev/> (and can assign a NVMe device to a domain
successfully) we don't have disk representation. There are three
problems with PCI assignment in case of a NVMe device:
1) domains with <hostdev/> can't be migrated
2) NVMe device is assigned whole, there's no way to assign only a
namespace
3) Because hypervisors see <hostdev/> they don't put block layer
on top of it - users don't get all the fancy features like
snapshots
NVMe namespaces are way of splitting one continuous NVDIMM memory
into smaller ones, effectively creating smaller NVMe-s (which can
then be partitioned, LVMed, etc.)
Because of all of this the following XML was chosen to model a
NVMe device:
<disk type='nvme' device='disk'>
<driver name='qemu' type='raw'/>
<source type='pci' managed='yes' namespace='1'>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</source>
<target dev='vda' bus='virtio'/>
</disk>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
64 lines
2.5 KiB
XML
64 lines
2.5 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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<disk type='nvme' device='disk'>
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<driver name='qemu' type='raw'/>
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<source type='pci' managed='yes' namespace='1'>
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<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
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</source>
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<target dev='vda' bus='virtio'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
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</disk>
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<disk type='nvme' device='disk'>
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<driver name='qemu' type='raw'/>
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<source type='pci' managed='yes' namespace='2'>
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<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
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</source>
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<target dev='vdb' bus='virtio'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
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</disk>
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<disk type='nvme' device='disk'>
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<driver name='qemu' type='raw'/>
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<source type='pci' managed='no' namespace='1'>
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<address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
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</source>
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<target dev='vdc' bus='virtio'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
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</disk>
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<disk type='nvme' device='disk'>
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<driver name='qemu' type='qcow2' cache='none'/>
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<source type='pci' managed='no' namespace='2'>
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<address domain='0x0001' bus='0x02' slot='0x00' function='0x0'/>
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<encryption format='luks'>
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<secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
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</encryption>
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</source>
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<target dev='vdd' bus='virtio'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
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</disk>
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<controller type='usb' index='0'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
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</controller>
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<controller type='pci' index='0' model='pci-root'/>
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<controller type='scsi' index='0' model='virtio-scsi'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
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</controller>
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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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</devices>
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</domain>
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