[Xen-devel] [PATCH] xen: allow HVM save/restore from different changesets

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

Allow HVM save/restore from different changesets of Xen.  
The HVM save records are supposed to be backwards compatible; XenServer
live-migrates between versions of Xen during upgrades.

Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>

diff -r 281896d3343a xen/common/hvm/save.c
--- a/xen/common/hvm/save.c     Thu Jul 08 12:07:16 2010 +0100
+++ b/xen/common/hvm/save.c     Thu Jul 08 12:10:59 2010 +0100
@@ -184,8 +184,6 @@
 
 int hvm_load(struct domain *d, hvm_domain_context_t *h)
 {
-    char *c;
-    uint64_t cset;
     struct hvm_save_header hdr;
     struct hvm_save_descriptor *desc;
     hvm_load_handler handler;
@@ -200,21 +198,6 @@
 
     if ( arch_hvm_load(d, &hdr) )
         return -1;
-
-    c = strrchr(xen_changeset(), ':');
-    if ( hdr.changeset == -1ULL )
-        gdprintk(XENLOG_WARNING, 
-                 "HVM restore: Xen changeset was not saved.\n");
-    else if ( c == NULL )
-        gdprintk(XENLOG_WARNING, 
-                 "HVM restore: Xen changeset is not available.\n");
-    else
-    {
-        cset = simple_strtoll(c, NULL, 16);
-        if ( hdr.changeset != cset )
-        gdprintk(XENLOG_WARNING, "HVM restore: saved Xen changeset (%#"PRIx64
-                 ") does not match host (%#"PRIx64").\n", hdr.changeset, cset);
-    }
 
     /* Down all the vcpus: we only re-enable the ones that had state saved. */
     for_each_vcpu(d, v) 

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