On 7/12/05, Luck, Tony <[EMAIL PROTECTED]> wrote: > This is better. But allowing access to region 6 through > /dev/kmem will open up a whole new set of problems. If the > user does an uncacheable read through region 6 from a memory > address that is mapped cacheably in region 7, then the > processor may machine check [SDM 4.4.1, page 2:64, last > paragraph: "It is recommended that the processor report a > Machine Check abort if the following memory attribute aliasing > is detected: * cache-hit on an uncacheable page"] > > So I think we should disallow access to region 6.
/dev/[k]mem should use the EFI memory attributes to determine accessibility. This is being done to some degree already (well, I didn't check the current code, but it's supposed to be there). --david - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
