On Thu, Aug 24, 2017 at 09:31:17AM -0700, Dan Williams wrote: > External agent is a DMA device, or a hypervisor like Xen. In the DMA > case perhaps we can use the fcntl lease mechanism, I'll investigate. > In the Xen case it actually would need to use fiemap() to discover the > physical addresses that back the file to setup their M2P tables. > Here's the discussion where we discovered that physical address > dependency: > > https://lists.xen.org/archives/html/xen-devel/2017-04/msg00419.html fiemap does not work to discover physical addresses. If they want to do anything involving physical address they will need a kernel driver. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
