xen-users
Re: [Xen-devel] DomU Kernel Mapping
As Mats says, the code is in tools/libxc. When you load an ELF binary
(such as a Linux kernel), the function
xc_dom_elfloader.c::xc_dom_load_elf_kernel() performs the mapping and
loading of the kernel.
The following chain of function calls maps the memory into dom0 for
loading the kernel:
xc_dom.h::xc_dom_seg_to_ptr() calls
xc_dom_core.c::xc_dom_pfn_to_ptr() calls
xc_dom_boot.c::xc_dom_boot_domU_map() calls
xc_{linux,solaris}.c::xc_map_foreign_ranges() which (for the Linux
case) performs an ioctl on the privcmd device, and maps the memory
into dom0 user-space using the mmu_update hypercall.
A call to libelf-loader.c::elf_load_binary() copies the kernel into
domU.
I should add that I'm currently working on moving this code to a
small, trusted domain. The goal would be to remove dom0's ability to
map arbitrary memory from other guests.
Hope this helps.
Regards,
Derek Murray.
On 17 Apr 2007, at 13:53, Security Initiative Team wrote:
Where is the code that maps the kernel of a DomU into memory?
i.e, when you do a xm create <config file>
what code is called to actually map the kernel into memory?
Is it a python script or is it re-directed to Dom0 to do?
Thanks.
-Brian
Ahhh...imagining that irresistible "new car" smell?
Check out new cars at Yahoo! Autos.
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