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xen: add new Xen elfnote types and use them appropriately

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Define recently added XEN_ELFNOTEs, and use them appropriately.
Most significantly, this enables domain checkpointing (xm save -c).

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-05-31 01:33:04 +01:00 committed by Ingo Molnar
parent d07af1f0e3
commit 7e0edc1bc3
2 changed files with 25 additions and 0 deletions
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5
arch/x86/xen/xen-head.S
View File

@ -7,6 +7,7 @@
#include <linux/init.h>
#include <asm/boot.h>
#include <xen/interface/elfnote.h>
#include <asm/xen/interface.h>
__INIT
ENTRY(startup_xen)
@ -32,5 +33,9 @@ ENTRY(hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz "!writable_page_tables|pae_pgdir_above_4gb")
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
.quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .long __HYPERVISOR_VIRT_START)
#endif /*CONFIG_XEN */

20
include/xen/interface/elfnote.h
View File

@ -120,6 +120,26 @@
*/
#define XEN_ELFNOTE_BSD_SYMTAB 11
/*
* The lowest address the hypervisor hole can begin at (numeric).
*
* This must not be set higher than HYPERVISOR_VIRT_START. Its presence
* also indicates to the hypervisor that the kernel can deal with the
* hole starting at a higher address.
*/
#define XEN_ELFNOTE_HV_START_LOW 12
/*
* List of maddr_t-sized mask/value pairs describing how to recognize
* (non-present) L1 page table entries carrying valid MFNs (numeric).
*/
#define XEN_ELFNOTE_L1_MFN_VALID 13
/*
* Whether or not the guest supports cooperative suspend cancellation.
*/
#define XEN_ELFNOTE_SUSPEND_CANCEL 14
#endif /* __XEN_PUBLIC_ELFNOTE_H__ */
/*