[Xen-devel] [PATCH 2/8] hvm: add HVM_PARAM_VM_GENERATION_ID_ADDR

[David Vrabel <david.vrabel@xxxxxxxxxx>]

HVM_PARAM_VM_GENERATION_ID_ADDR is the guest physical address of the
VM Generation ID.  This parameter will be written by hvmloader and read
by the toolstack when updating the gen. ID (e.g., after restoring from a
snapshot).

A HVM parameter is easier for the save/restore code to work with (than
a XenStore key).

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/public/hvm/params.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 517a184..4d7c692 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -145,6 +145,9 @@
 /* SHUTDOWN_* action in case of a triple fault */
 #define HVM_PARAM_TRIPLE_FAULT_REASON 31
 
-#define HVM_NR_PARAMS          32
+/* Location of the VM Generation ID in guest physical address space. */
+#define HVM_PARAM_VM_GENERATION_ID_ADDR 32
+
+#define HVM_NR_PARAMS          33
 
 #endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
-- 
1.7.10.4


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