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[Xen-devel] Trouble using update_va_mapping

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: Mathieu Ropert <mro@xxxxxxxxxx>
  • Date: Mon, 13 Feb 2006 17:06:47 +0100
  • Delivery-date: Mon, 13 Feb 2006 16:42:31 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


i'm trying to run a very simple domU kernel on Xen/x86_64, and i'm getting some trouble with update_va_mapping(): when trying to remap some page table entry, i find the virtual address still pointing to the same machine address after the return of the hypercall.

Here's the interesting part of the code:

       cons = (struct xencons_interface *) addr;
       cons->out_prod = 0x42;

if (HYPERVISOR_update_va_mapping (addr, (xen_start_info->console_mfn << PAGE_SHIFT) | 0x67, 0))
               BUG ();

       tlb_flush ();

       cons = (struct xencons_interface *) addr;

       if (cons->out_prod == 0x42) /* Fails here */
               BUG ();

I've double-checked hypercalls and tlb_flush() function, all seems fine. So my guess is that either i missed something in the docs, or there's something wrong with update_va_mapping().



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