[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 7/7] xen/arm: Blacklist some sun7i UARTs
On 27/09/13 18:02, Julien Grall wrote: > On 09/22/2013 03:40 PM, Ian Campbell wrote: >> On Sat, 2013-09-21 at 21:28 +0100, Julien Grall wrote: >>> On 09/20/2013 10:41 PM, Ian Campbell wrote: >>>> On Fri, 2013-09-20 at 20:02 +0100, Julien Grall wrote: >>>> >>>>>> + /* >>>>>> + * These UARTs share a page with the Xen console UART, so we don't >>>>>> + * want to map them through. >>>>>> + */ >>>>>> + DT_MATCH_PATH("/soc@01c00000/serial@01c28000"), >>>>>> + DT_MATCH_PATH("/soc@01c00000/serial@01c28400"), >>>>>> + DT_MATCH_PATH("/soc@01c00000/serial@01c28800"), >>>>>> + DT_MATCH_PATH("/soc@01c00000/serial@01c28c00"), >>>>> Can we blacklist all the UARTs via a DT_MATCH_COMPATIBLE? It's better >>>>> than relying on the path that can be changed easily in the device tree. >>>> There are other UARTS (at 0x1c29xxx) which could safely be exposed to >>>> dom0. Perhaps it is better to just blacklist the whole lot though. >>> These UARTs also share the same page, what prevents the user to use >>> these UARTs? >> Nothing, but because they don't share a page with the xen UART they >> don't cause it to get exposed to dom0. > My question wasn't clear. What does prevent the user to use another UART > for Xen? > Nothing "prevents" it. That is the problem. If several UARTs are on the same page, Xen cannot safely isolate its UART from dom0/domU. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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