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.
