[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Adding PTE Flag during Page Fault
I altered the method, "__spurious_page_fault", in "xen/arch/x86/traps.c" to change a page to present when it is marked as not present. I am attempting to do this using the "l1e_add_flags(l1e, _PAGE_PRESENT);" definition call. I then set it to return EXCRET_fault_fixed, so the trap should have the client retry what it was doing with the changes I made. Unfortunately after it returns from the page fault to the user, it immediately faults again on the same error at the same memory location. This means my "l1e_add_flags(l1e, _PAGE_PRESENT)" is not actually updating the correct location in memory or if it is, the changes get discarded immediately. Does anyone who is familiar with the page_fault trap code have any idea why my change to the PTE is not sticking. I tried doing a TLB flush for the memory address, but the same thing happens. My only other guess is that the l1e defined in the function is just a copy of the actual table entry, so I need to look back further where l1e was defined. Thanks, Joe _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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