[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: Possible regression in "x86-64: reduce range spanned by 1:1 mapping and frame table indexes"
>>> Simon Horman <horms@xxxxxxxxxxxx> 11.12.09 02:39 >>> >106705 sh: sh_page_fault__guest_2(): fast path mmio 0x000000000b8f9e >106706 sh: sh_page_fault__guest_2(): d:v=1:0 va=0xf30000d8 err=2, rip=6f6 >... >106721 shdebug: make_fl1_shadow(): (f3000)=>118644 >106722 sh: set_fl1_shadow_status(): gfn=f3000, type=00000002, smfn=118644 >106723 shdebug: _sh_propagate(): demand write level 2 guest f30000e7 shadow >0000000118644067 >106724 sh: sh_page_fault__guest_2(): 3241: L >106725 shdebug: _sh_propagate(): demand write level 1 guest f3000067 shadow >00000000f0500037 >106726 sh: sh_page_fault__guest_2(): 3263: M >106727 shdebug: _sh_propagate(): prefetch level 1 guest f3001067 shadow >00000000f0501037 >... >106770 sh: sh_page_fault__guest_2(): emulator failure, unshadowing mfn 0xf0500 >106771 sh: sh_remove_shadows(): d=1, v=0, gmfn=f0500 The thing is that calling sh_remove_shadows(), as it is implemented, is invalid for mmio pages, as there's no guarantee that those would have a struct page_info associated (and there never was such a guarantee, with the patches referenced the likelihood just increased that this would happen). A possible fix would seem to be to simply do nothing in sh_remove_shadows() if !mfn_valid(gmfn), but me not really being knowledgeable in shadow code means that this may be the entirely wrong thing to do. Tim? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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