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Re: [Xen-devel] Setting up page directories and tables
- To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
- From: "Dave Pacheco" <dap@xxxxxxxxxxxx>
- Date: Fri, 27 Apr 2007 20:56:12 -0400
- Cc: Joel Weinberger <joel@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 27 Apr 2007 17:54:44 -0700
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On 4/27/07, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
On 27/4/07 21:11, "Dave Pacheco" <
dap@xxxxxxxxxxxx> wrote:
All of these steps succeed (the hypercall returns 0, and the argument indicating how many updates succeeded is 1 in both cases). But later, when switching into the context of this process, I try to update the user base pointer with
HYPERVISOR_mmuext_op({MMUEXT_NEW_USER_BASEPTR, mfn of P}...).
Only x86/64 has a separate USER_BASEPTR. You want to use just MMUEXT_NEW_BASEPTR.
When I use that, the domain immediately crashes. I would have expected a page fault, since the page tables aren't actually set up yet, but I don't even get that. (It's possible that it faulted again trying to load the fault handler.)
/var/log/xen/xend.log doesn't say much useful, other than that the domain crashed. Is there a way to tell why a domain crashed (i.e. executing an illegal instruction, or triple fault, or something like that)?
Thanks,
Dave
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