Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram

[Paolo Bonzini]

On 01/02/2018 14:21, Eduardo Habkost wrote:
>> The device looks at its own private page tables, and not
>> to the OS ones.
> I'm still confused by your statement that the device builds its
> own [IOVA->PA] page table.  How would the device do that if it
> doesn't have access to the CPU MMU state?  Isn't the IOVA->PA
> translation table built by the OS?

The driver builds a page table for the device, either when it pins the
pages or by using MMU notifiers.

Paolo