From mboxrd@z Thu Jan 1 00:00:00 1970 From: Trammell Hudson Subject: Setting page type for GDT page Date: Fri, 31 Aug 2007 12:15:38 -0400 Message-ID: <20070831161538.GA25713@osresearch.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org 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