On 11/21/24 5:33 AM, Florian Lohoff via wrote: > > Hi, > is there a way with qemu-guest-agent to push infos down to the > hypervisor?
I may be placing undue emphasis on your use of the word "push", but as far as I'm aware, qemu-guest-agent strictly responds to requests *from* the hypervisor, and does not have a way of sending information unsolicited to it. > In VMWare one cat set guestinfo variables from within the guest which > can then be retrieved from the Hypervisor. This enables a trusted way to > pass on information for example ssh host keys which we use after > installation. > > We try to avoid connecting with -o stricthostkeychecking=no and > insecurities alike. So having an off-channel method of retrieving > ssh keys would be nice. That said, the hypervisor can send requests to qemu-ga whenever it wants (assuming the guest agent is listening.) The qemu-ga protocol supports a number of remote procedure calls[1]. I recommend checking it out. With regards to the specific use-case above, you might be able to accomplish that with one or more of guest-file-open, guest-exec, or maybe something else I didn't see. [1] https://www.qemu.org/docs/master/interop/qemu-ga-ref.html -- Connor
