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Re: Out-of-Process Device Emulation session at KVM Forum 2020
From: |
Stefan Hajnoczi |
Subject: |
Re: Out-of-Process Device Emulation session at KVM Forum 2020 |
Date: |
Thu, 29 Oct 2020 12:08:37 +0000 |
Here are notes from the session:
protocol stability:
* vhost-user already exists for existing third-party applications
* vfio-user is more general but will take more time to develop
* libvfio-user can be provided to allow device implementations
management:
* Should QEMU launch device emulation processes?
* Nicer user experience
* Technical blockers: forking, hotplug, security is hard once
QEMU has started running
* Probably requires a new process model with a long-running
QEMU management process proxying QMP requests to the emulator process
migration:
* dbus-vmstate
* VFIO live migration ioctls
* Source device can continue if migration fails
* Opaque blobs are transferred to destination, destination can
fail migration if it decides the blobs are incompatible
* How does the VMM share the migration data region with the
device emulation process?
* The vfio-user protocol can trap or mmap
* device versioning (like versioned machine types) needed to pin
the guest-visible device ABI
* Felipe will investigate live migration
reconnection:
* How to support reconnection?
* QEMU has relatively little state of a vfio-user device
* vhost-user has more state so it's a little easier to
reconnect or migrate
* Build in reconnection and live migration from the start to avoid
difficulties in the future
* Relationship between migration and reconnection?
* VFIO has a mechanism for saving/loading device state
* Lots of different reconnection cases that need to be thought through
security & sandboxing:
* Goal: make it easy to lock down the process so developers don't
need to reinvent sandboxing
* minijail
* in-process
* firecracker jailer
* bubblewrap
* launcher tool
* systemd-run
* launcher tool
- Out-of-Process Device Emulation session at KVM Forum 2020, Stefan Hajnoczi, 2020/10/27
- RE: Out-of-Process Device Emulation session at KVM Forum 2020, Thanos Makatos, 2020/10/28
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Michael S. Tsirkin, 2020/10/28
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Stefan Hajnoczi, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020,
Stefan Hajnoczi <=
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Jason Wang, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Paolo Bonzini, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Stefan Hajnoczi, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Alex Williamson, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Jason Wang, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Alex Williamson, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Paolo Bonzini, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Jason Wang, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Alex Williamson, 2020/10/29
- Re: Out-of-Process Device Emulation session at KVM Forum 2020, Stefan Hajnoczi, 2020/10/30