On Fri, 31 May 2019 13:32:29 +0000 Thanos Makatos <[email protected]> wrote:
> When configuring device pass-through via VFIO to a VM, I noticed that > QEMU tries to register (DMA_MAP) all memory regions of a guest (not > only RAM). That includes firmware regions like "pc.rom". Would a > physical device ever need access to those? Probably not, but are those things not in the address space of the device on a physical system? > Am I missing something? Does this cause a problem? It's not always easy to identify regions that should not be mapped to a device, clearly we're not going to create a whitelist based on the name of the region. Thanks, Alex
