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Re: [Qemu-discuss] virtio device instances identification by guest

From: Artem Pisarenko
Subject: Re: [Qemu-discuss] virtio device instances identification by guest
Date: Thu, 8 Nov 2018 17:20:53 +0600

Ok, I found a way better, but it still not elegant, because depends on
machine hardware configuration. One may use 'addr' property to assign
address on PCI bus (and, if there are multiple PCI buses, identify bus
somehow, but I didn't looked at).
In my case on x86_64 target with default machine and given '-device
virtio-net-pci,addr=<hex_8bit_id>.0,...' on command line guest application
can get network interface name with:
`ls /sys/devices/pci0000\:00/0000\:00\:<hex_8bit_id>.0/virtio*/net/`

чт, 8 нояб. 2018 г. в 14:56, Artem Pisarenko <address@hidden>:

> Forgot to clarify that identification needs to be unique only to machine
> scope. 'virtio-net-pci' has 'mac' property, but if user wants to
> instantiate multiple such machines and connect them in one network, then
> 'mac' value also needs to be unique per this network. Thus, user have to
> generate 'mac' from some <network host id> and <NIC id> parts and guest
> should find network interface by mac address masked with <NIC id> part.
> Itsn't as elegant as in examples above. Although, it's better than
> nothing...
> чт, 8 нояб. 2018 г. в 14:18, Artem Pisarenko <address@hidden
> >:
>> Hi everyone,
>> Is there are any way to make guest system able to identify specific
>> instances of virtio devices as specified by qemu user (on command line or
>> via qmp command)?
>> More specifically, I'm interested in virtio-net devices.
>> I know it's possible for some other devices:
>> - virtserialport/virtconsole have 'name=<name>' property and guest
>> application accesses serial device via "/dev/virtio-ports/<name>"
>> - virtio-9p-pci/virtfs have 'mount_tag=<mount_tag>' and guest
>> application mounts filesystem with "mount -t 9p -o trans=virtio <mount_tag>
>> ..."
>> But I cannot find any way to associate '-device virtio-net-pci' instances
>> with eth<X> network interfaces in guest.
>> Thanks in advance,
>> Artem

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