On Wed, 14 Jul 2021 at 13:12, <c...@etri.re.kr> wrote: > > On second thought, I guess the application should convert the virtual address > to physical address (by reading the page table) and write the value to the > register.
Yes. Generally models that emulate real devices will always operate on physical addresses, because in hardware they are separate from the CPU and don't have access to the virtual-to-physical translation that the CPU does. It is possible to design purely virtual hardware that wants to take a virtual address, but this is a bad idea: a buffer that's a contiguous lump of virtual memory could be non-contiguous in physical memory if it spans multiple pages; and QEMU's APIs are not designed to make it easy to do virtual-to-physical lookups from a device model. thanks -- PMM
