> From: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Sent: Wednesday, December 18, 2019 12:31 AM > > On 17/12/19 17:18, Alex Williamson wrote: > >> > >> Alex, if you are OK we'll work on such interface and move kvmgt to use it. > >> After it's accepted, we can also mark pages dirty through this new > interface > >> in Kirti's dirty page tracking series. > > I'm not sure what you're asking for, is it an interface for the host > > CPU to read/write the memory backing of a mapped IOVA range without > > pinning pages? That seems like something like that would make sense for > > an emulation model where a page does not need to be pinned for physical > > DMA. If you're asking more for an interface that understands the > > userspace driver is a VM (ie. implied using a _guest postfix on the > > function name) and knows about GPA mappings beyond the windows > directly > > mapped for device access, I'd not look fondly on such a request. > > No, it would definitely be the former, using IOVAs to access guest > memory---kvmgt is currently doing the latter by calling into KVM, and > I'm not really fond of that either. > Exactly. let's work on the fix. Thanks Kevin
