[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH - proposed] XI Shadow Page Table Mechanism]
Hi, Robert, There is another minor problem. in dt_init_action: + if (_32pae_l3 || c_curr_accessed) + action |= a_present; + /* else make present when accessed */ + if (c_curr_rw) + action |= a_rw; According to your comments, the following snippet may be more correct: + if (_32pae_l3 || c_curr_accessed) + action |= a_present; + /* else make present when accessed */ + if (c_curr_rw && !_32_pae_l3) + action |= a_rw;The doc said we should retain R/W be zero for pae_l3_pte in legacy mode. If returned a_rw, resync_spte will set _PAGE_RW for the corresponding spte. _______________________________________________________ Best Regards, hanzhu Robert Phillips дµÀ: Yes, that's true. If the caller supplied a bogus PFN (one larger than ram size), we'd crash. BTW, we are avoiding use of grant table transfers because they fragment PSE pages. -- rsp On 6/30/06, zhu <vanbas.han@xxxxxxxxx> wrote:I'm afraid it could trigger some certain problems only when you open l2 PSE flag and use grant table to transfer pages between domains. I'm not very sure about it. :-) _______________________________________________________ Best Regards, hanzhu Robert Phillips $B<LF;(B: > Hi Han, > You are right again. I have not seen this cause a problem but we'll > certainly fix it. > -- rsp > > On 6/29/06, zhu <vanbas.han@xxxxxxxxx> wrote: >> >> Hi, Robert, >> I found out another confusing code snippet: >> in void xi_invl_mfn(struct domain *d, unsigned long mfn) >> if (ext && pfn < ext->large_page_aligned_size) >> >> According to the code, it should be >> if (ext && (pfn>>SPT_ENTRIES_ORDER) < ext->large_page_aligned_size) >> >> If I made any mistake, please point it out. >> _______________________________________________________ >> Best Regards, >> hanzhu >> > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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