在 2021/6/4 上午2:00, Andi Kleen 写道:
On 6/3/2021 10:33 AM, Andy Lutomirski wrote:
On 6/2/21 5:41 PM, Andi Kleen wrote:
Only allow split mode when in a protected guest. Followon
patches harden the split mode code paths, and we don't want
an malicious host to force anything else. Also disallow
indirect mode for similar reasons.
I read this as "the virtio driver is buggy. Let's disable most of the
buggy code in one special case in which we need a driver without bugs.
In all the other cases (e.g. hardware virtio device connected over
USB-C), driver bugs are still allowed."
My understanding is most of the other modes (except for split with
separate descriptors) are obsolete and just there for compatibility.
As long as they're deprecated they won't harm anyone.
-Andi
For "mode" do you packed vs split? If yes, it's not just for
compatibility. Though packed virtqueue is designed to be more hardware
friendly, most hardware vendors choose to start from split.
Thanks
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
