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xen-ia64-devel
RE: [Xen-ia64-devel] Strange problem with virtual aliases
Hi,
Matthew Chapman write on 2006年11月29日 16:13:
> Hi folks,
>
> I have a curious Xen/ia64 problem which looks like it could be a bug.
>
> I'm running my own small OS in DomU. I've created two mappings which
> are supposed to be aliases; one is a large identity mapping, pinned
> through a translation register, the other maps a specific page:
>
> itr.d dtr[r0]: 0x2000000000000000 -> 0 size 256M
> (thus 0x2000000002500000 -> 0x2500000)
> itc.d: 0x00000000fbdf7000 -> 0x2500000 size 4K
Did you access 0xfbdf7038 in guest physical mode?
Seems domU only support identity mapping in region 0.
Anthony.
>
> tpa from inside the domain "proves" that the mappings are aliases:
>
> tpa(0x2000000002500038) = 0x2500038
> tpa(0xfbdf7038) = 0x2500038
>
> However reading the data shows they are not:
>
> *(0x2000000002500038) = 0x2000000001
> *(0xfbdf7038) = 0
>
> The real hardware TLB indeed has different physical addresses for the
> two pages:
>
> # VA PA RID KEY PS MA ATTR
> PL PERMS 14 V A 00000000fbdf7000 0000017309000 000008 000000 4K
> WB p a d 2 rwrwrw-- 69 V A 2000000002500000 0000017c00000
> 010008 000000 4K WB p a d 2 rwrwrw--
> ^^^^^^^^^^^^^
>
> Before I spend more time delving through Xen, does anyone have any
> ideas
> how this could have happened?
>
> N.B. I've compiled Xen with 4KB page size which may or may not be
> relevant... most likely not since Xenlinux runs fine.
>
> Matt
>
>
> _______________________________________________
> Xen-ia64-devel mailing list
> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-ia64-devel
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