-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Fri, Oct 07, 2016 at 07:57:35AM -0700, neilhard...@gmail.com wrote: > Presumably through the CPU. > > We know this option exists for hard drives for a facts. > > So I see no reason you couldn't get Ethernet + WiFi chips without DMA. > > Not all devices support switching off DMA, so I can see why Qubes decided to > use VT-D + Xen instead. > > But certainly, I think there are devices out there without DMA. I think you > just need to search the market for a Ethernet/WiFi that supports non-DMA.
I don't think any modern network adapter support non-DMA mode, with decent performance (if at all). Using CPU for just transferring the data is horrible waste of resources (few hundreds of instructions for 1KB). Regarding Xen and VT-d - Xen responsibility is only to setup allowed memory areas for given device. Actual enforcement is done by the hardware. - -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJX9+agAAoJENuP0xzK19cspTcH/2vRRR+gkaBXw0yf04BXSkA/ ooAGvCEV/If/gVXs0LiLyGLoBw/SC6HSEFu9WUEiXUnTrmY41M/H4WCDx5oXAOwP /cO0Wa0anq9QG5AkxEaJvySI043wQiBi0ZIBLxSMNGRbqi+jxr09Fvf/E31sBClh t0duS2RCJK4v1AiWh6SrGYUrWh4ijGxMwlHjyUPT/931aCLb9YRp8Hszg19lQ95i JituYaAVmQNZ+Rh8VMOKhgdViLLIYAHuswTQt/wKfsjxx79nPbOGRfyEVgYofJ7I mv6doHzzWfds5hnR1WkPxiLI67yk0AJ7QD6zpvvuGYPEpWIVvSHOjGW4JauIP7M= =NTct -----END PGP SIGNATURE----- -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/20161007181706.GI15776%40mail-itl. For more options, visit https://groups.google.com/d/optout.
