On 07/06/2015 03:20 AM, Oliver Neukum wrote: > On Fri, 2015-07-03 at 10:51 +0200, Krzysztof Opasiak wrote: >> Doesn't we have the same problem with functionfs/gadgetfs and >> dummy_hcd? >> Or with fuse? >> >> It's a very generic problem for all "virtualized devices" and it is >> known for quite a long time. This is why many tutorials about swap >> warns >> that swap should be set up only on real block devices which are fully >> served in kernel. > > Indeed. But the point is that it isn't limited to swap. As you as > a page needs to be laundered the problem exists. > Mmapping a file for write (non private) is enough. I'm persuaded to avoid user space in the core design. Anything else fundamental to usbip that should inform the design of a usbredir driver? usbip appears to be based off a 2004 vintage of dummy_hcd. I'll look thoughtfully at the current dummy_hcd; please let me know if there is anything else I should consider. Cheers, Jeremy -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
