[Xen-API] Question about vm hardware configs (nic model)

[Hanfei Shen <qqshfox@xxxxxxxxx>]

Hi all,

I wonder where these configs come from:
qemu-dm-48 -d 48 -m 4096 -boot dc -serial pty -vcpus 4 -videoram 4 -vncunused -k en-us -vnc 127.0.0.1:1 -usb -usbdevice tablet -net nic,vlan=0,macaddr=ae:af:b1:b2:94:1a,model=rtl8139 -net tap,vlan=0,bridge=xenbr0,ifname=tap48.0 -acpi -monitor pty

Is it possible to make changes to the hardware of VMs? For
example change NIC model (to virtio)? I know there's a hack to rewrite the `/usr/lib/xen/bin/qemu-dm` or `/opt/xensource/libexec/qemu-dm-wrapper` to replace the `rtl8139` to `virtio`. It will have a effect on all the VMs created later.

I've made several attempts to solve this by myself, such as changing the vif params:

# xe vif-param-list uuid=c08d1381-ed1c-0880-8e5f-ac238a556160
uuid ( RO)                        : c08d1381-ed1c-0880-8e5f-ac238a556160
                     vm-uuid ( RO): f092bb24-11ee-e5a3-3cfd-1c8c83161407
               vm-name-label ( RO): Other install media (1)
          allowed-operations (SRO): attach
          current-operations (SRO):
                      device ( RO): 0
                         MAC ( RO): 92:61:9c:7a:da:09
           MAC-autogenerated ( RO): true
                         MTU ( RO): 1500
          currently-attached ( RO): false
          qos_algorithm_type ( RW):
        qos_algorithm_params (MRW):
    qos_supported_algorithms (SRO):
                other-config (MRW):
                network-uuid ( RO): 8afa3eea-9ec0-0a6c-1208-580cad692cb2
          network-name-label ( RO): Pool-wide network associated with eth0
                 io_read_kbs ( RO): <unknown>
                io_write_kbs ( RO): <unknown>
                locking-mode ( RW): network_default
                ipv4-allowed (SRW):
                ipv6-allowed (SRW):

Add a config (`other-config:model=virtio`) into the `other-config` section, but no luck. Is there a better way to change the setting for a specific VM?

Best regards,
Hanfei

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