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A comment on Why Xen Wasn't Hit by RETBleed on Intel CPUs. Parent comment

Re:Why Xen Wasn't Hit by RETBleed on Intel CPUs by bonzini on Friday August 26, 2022 @02:55PM (#32611349)
These days Amazon emulates the Xen hypercall interface on top of KVM. It's pretty much their sole substantial contribution to upstream KVM (by David Woodhouse that's mentioned elsewhere in the comments in fact).

The implementation is split between KVM and their proprietary equivalent of QEMU.

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Re:Why Xen Wasn't Hit by RETBleed on Intel CPUs by dwmw2 on Tuesday August 30, 2022 @04:42AM (#32648051)
We should remember to credit Oracle for starting the Xen-on-KVM work. I did start from their old patch set, even if what got merged was significantly different in the end.

I do still want to flesh out the Xen guest support in Rust-VMM at some point.

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