Re: [PATCH v3 00/21] TDX host kernel support

[Dave Hansen]

On 4/29/22 14:20, Dan Williams wrote:
> Is there something already like this today for people that, for
> example, attempt to use PCI BAR mappings as memory? Or does KVM simply
> allow for garbage-in garbage-out?

I'm just guessing, but I _assume_ those garbage PCI BAR mappings are how
KVM does device passthrough.

I know that some KVM users even use mem= to chop down the kernel-owned
'struct page'-backed memory, then have a kind of /dev/mem driver to let
the memory get mapped back into userspace.  KVM is happy to pass through
those mappings.