[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Problem setting up a custom GDT
At Fri, 09 Jun 2006 13:07:02 +0200, Mathieu Ropert wrote: > > Simon Kagstrom wrote: > > >Hello! > > > >I have some problems setting up a custom GDT (I need one where the > >code is readable). Anyway, I try to switch to my own GDT as follows: > > > > unsigned long frames[16]; > > > > volatile unsigned long va = (unsigned long)GDT; > > volatile unsigned long pa = to_phys(va); > > volatile unsigned long ma = phys_to_machine(pa) & ~_PAGE_RW | > > _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY; > > > > /* Make it read-only */ > > HYPERVISOR_update_va_mapping(va, (pte_t){ ma }, 0); > > frames[0] = ma; > > The machine address you pass to Xen is a page table entry. Xen want a > machine frame number. > > frames[0] = ma >> PAGE_SHIFT; > > should fix you problem. Ah, thank you! This fixed the problem! I see now that Linux uses virt_to_mfn() - I should have looked at that one... // Simon _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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