Re: Virtualization layers

On Wed, 16 Apr 2025 21:48:49 +0000, Stefan Monnier wrote:

Given 4 layers in the stack {Secure, Hyper, Super, User} and we have
interrupts targeting {Secure, Hyper, Super}, do we pick up any liability
or do we gain flexibility by being able to target interrupts directly to
{user} ?? (the 4th element).

>
All these discussions seem to presume a very fixed structure that (I
presume) corresponds to a typical situation in servers nowadays.
>
But shouldn't the hardware aim for something more flexible to account
for other use cases?

The goal is that::
The two layers in the middle can be managed as an accordion; supporting
any number of HVs and GuestOSs between Secure and User.

E.g. What if I want to run my own VM as a user?  Or my own HV?
That's likely to be a common desire for people working on the
development and testing of OSes and HVs?

Use the accordion

>
        Stefan