[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-ia64-devel] Memory problem with mini-os
Am Montag, 2. Oktober 2006 09:57 schrieb Tristan Gingold: > Le Lundi 02 Octobre 2006 09:35, Dietmar Hahn a écrit : > > Hi, > > > > after my vacation I switched from xen-ia64 change-set 11039 to 11635. > > And now I have a problem with my mini-os executing the efi/pal code > > (currently the getTime - function from efi). Every time the function gets > > called I get an trap 22 (Instruction access rights vector). The strange > > thing is that the trap also occurs if I don't do the mapping of the pal > > code. > > I inserted some trace messages in vcpu_itr_i() in xen to see all > > parameters. But it looks ok. > > For a test I removed the call of in ia64_itr() in efi_map_pal_code() in > > the linux code and nevertheless efi_gettimeofday() runs fine (linux as > > domU). It seems, there is another tlb entry for this page. > > I saw that the pal/efi stuff was reorganized in the new change-set. > > Can anybody give me a hint where to look in the memory handling or do > > some trace messages! I'm currently still not familiar enough with this > > stuff. > > Hi, > > After your comments I have reorganized fw memory. To much honour ;-), > The PAL/SAL/EFI firmware is now between 0 and 4Kb. > ACPI and system tables are between 4Kb and 12Kb. > Because the size is very small there might be an entry in the TLB even > without the itr. > > I think you should start debugging gu understand where and why the fault > occurs. You may modify Xen to disp more details when a fault is reflected. > > Tristan. I think I understand the problem! I use the Alternate Data TLB trap for the data translations needed for efi/pal/sal/acpi. These translations are done with access rights RW. In XEN ITC and DTC seem to be unified, so the data tlb entry is used for the translation of the efi-code. And there is no X bit set -> trap 22. If I set RWX for the access rights of the data translations all runs well. The better way is a ptc.l before mapping of the pal code via a itr.i! Thanks. DIetmar. _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel
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