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[Xen-devel] Setting page type for GDT page

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Setting page type for GDT page
From: Trammell Hudson <hudson@xxxxxxxxxxxxxx>
Date: Fri, 31 Aug 2007 12:15:38 -0400
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I'm trying to install my own GDT in a lightweight kernel domU
and am receiving an error from HYPERVISOR_set_gdt() that my page
does not have the expected type.  I've made sure that the page is
mapped read-only and walked the active page tables to check for
any writable mappings.  There are two mappings of page 0x2abcd,
both with only the present and user bits set:

load_gdt_xen:313: Setting GDT page 0000006000524000 read-only
Mappings of 0000006000524000 (page 000000002abcd000):
PML1 0x6000024000[124] = 001000002abcd005 (va=0000000000524000 000 000 002 124)
PML1 0x6000024000[124] = 001000002abcd005 (va=0000006000524000 000 180 002 124)
load_gdt_xen:318: Setting GDT 0x6000524000 => 000000000002abcd (12 entries)
(XEN) mm.c:1664:d10 Bad type (saw 00000000e8000001 != exp 00000000a0000000) for 
mfn 2abcd (pfn 524)
load_gdt_xen:322: Unable to set GDT!  rc=-22

Is there a way to designate that the page will be used for the GDT,
similar to MMUEXT_PIN_L4_TABLE?

-- Trammell

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