On 06/05/2021 11:42, Julien Grall wrote:
From: Julien Grall <jgr...@amazon.com>
Unfortunately, the code to support Live Update has already been merged in
Kexec and shipped since 2.0.21. Reserve the IDs used by Kexec before they
end up to be re-used for a different purpose.
This patch reserves two IDs:
* KEXEC_TYPE_LIVEUPDATE: New operation to request Live Update
* KEXEC_MA_RANGE_LIVEUPDATE: New range to query the Live Update
area below Xen
Signed-off-by: Julien Grall <jgr...@amazon.com>
Reviewed-by: Paul Durrant <p...@xen.org>
---
xen/include/public/kexec.h | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/xen/include/public/kexec.h b/xen/include/public/kexec.h
index 3f2a118381ba..650d2feb036f 100644
--- a/xen/include/public/kexec.h
+++ b/xen/include/public/kexec.h
@@ -71,17 +71,22 @@
*/
/*
- * Kexec supports two types of operation:
+ * Kexec supports three types of operation:
* - kexec into a regular kernel, very similar to a standard reboot
* - KEXEC_TYPE_DEFAULT is used to specify this type
* - kexec into a special "crash kernel", aka kexec-on-panic
* - KEXEC_TYPE_CRASH is used to specify this type
* - parts of our system may be broken at kexec-on-panic time
* - the code should be kept as simple and self-contained as possible
+ * - Live update into a new Xen, preserving all running domains
+ * - KEXEC_TYPE_LIVE_UPDATE is used to specify this type
+ * - Xen performs non-cooperative live migration and stores live
+ * update state in memory, passing it to the new Xen.
*/
-#define KEXEC_TYPE_DEFAULT 0
-#define KEXEC_TYPE_CRASH 1
+#define KEXEC_TYPE_DEFAULT 0
+#define KEXEC_TYPE_CRASH 1
+#define KEXEC_TYPE_LIVEUPDATE 2
/* The kexec implementation for Xen allows the user to load two
@@ -150,6 +155,8 @@ typedef struct xen_kexec_load_v1 {
#define KEXEC_RANGE_MA_EFI_MEMMAP 5 /* machine address and size of
* of the EFI Memory Map */
#define KEXEC_RANGE_MA_VMCOREINFO 6 /* machine address and size of vmcoreinfo
*/
+/* machine address and size of the Live Update area below Xen */
+#define KEXEC_RANGE_MA_LIVEUPDATE 7
/*
* Find the address and size of certain memory areas
