Re: [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO

Srivatsa Vaddagiri
2020-04-30T10:30:12Z

* Will Deacon <will@kernel.org> [2020-04-30 11:08:22]:

> > This patch is meant to seek comments. If its considered to be in right
> > direction, will work on making it more complete and send the next version!
>
> What's stopping you from implementing the trapping support in the
> hypervisor? Unlike the other patches you sent out, where the guest memory
> is not accessible to the host, there doesn't seem to be any advantage to
> not having trapping support, or am I missing something here?

Hi Will,
I have had this discussion with hypervisor folks. They seem to be
concerned about complexity of having a VM's fault be handled in another
untrusted VM. They are not keen to add MMIO support.