mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-12-26 23:55:23 +00:00
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'>
|
|
<name>QEMUGuest1</name>
|
|
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
|
|
<memory unit='KiB'>219136</memory>
|
|
<currentMemory unit='KiB'>219136</currentMemory>
|
|
<vcpu placement='static'>1</vcpu>
|
|
<os>
|
|
<type arch='i686' machine='pc'>hvm</type>
|
|
<boot dev='hd'/>
|
|
</os>
|
|
<clock offset='utc'/>
|
|
<on_poweroff>destroy</on_poweroff>
|
|
<on_reboot>restart</on_reboot>
|
|
<on_crash>destroy</on_crash>
|
|
<devices>
|
|
<emulator>/usr/bin/qemu-system-i386</emulator>
|
|
<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'/>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
|
|
</disk>
|
|
<disk type='nvme' device='disk'>
|
|
<driver name='qemu' type='raw'/>
|
|
<source type='pci' managed='yes' namespace='2'>
|
|
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
|
|
</source>
|
|
<target dev='vdb' bus='virtio'/>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
|
|
</disk>
|
|
<disk type='nvme' device='disk'>
|
|
<driver name='qemu' type='raw'/>
|
|
<source type='pci' managed='no' namespace='1'>
|
|
<address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
|
|
</source>
|
|
<target dev='vdc' bus='virtio'/>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
|
|
</disk>
|
|
<disk type='nvme' device='disk'>
|
|
<driver name='qemu' type='qcow2' cache='none'/>
|
|
<source type='pci' managed='no' namespace='2'>
|
|
<address domain='0x0001' bus='0x02' slot='0x00' function='0x0'/>
|
|
<encryption format='luks'>
|
|
<secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
|
|
</encryption>
|
|
</source>
|
|
<target dev='vdd' bus='virtio'/>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
|
|
</disk>
|
|
<controller type='usb' index='0'>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
|
|
</controller>
|
|
<controller type='pci' index='0' model='pci-root'/>
|
|
<controller type='scsi' index='0' model='virtio-scsi'>
|
|
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
|
|
</controller>
|
|
<input type='mouse' bus='ps2'/>
|
|
<input type='keyboard' bus='ps2'/>
|
|
<memballoon model='none'/>
|
|
</devices>
|
|
</domain>
|