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File 584fc649-fix-determining-when-domain-creation-is-complete.patch of Package xen (Revision 18d9f567aa76ad786ec2ce93bd88d638)

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# Commit 9d71e02e8420b5d4a48d92446a1edbff498ee1c6
# Date 2016-12-13 09:58:33 +0000
# Author Andrew Cooper <andrew.cooper3@citrix.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
xen: Fix determining when domain creation is complete

d->creation_finished is used in several places alter behaviour depending on
whether the domain is being created, or is already running.

However, there is a latent bug if a toolstack component makes a pair of
pause/unpause calls, where creation will be considered finished prematurely.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Paul Durrant <paul.durrant@citrix.com>

--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1004,13 +1004,6 @@ int domain_unpause_by_systemcontroller(s
 {
     int old, new, prev = d->controller_pause_count;
 
-    /*
-     * We record this information here for populate_physmap to figure out
-     * that the domain has finished being created. In fact, we're only
-     * allowed to set the MEMF_no_tlbflush flag during VM creation.
-     */
-    d->creation_finished = true;
-
     do
     {
         old = prev;
@@ -1022,6 +1015,20 @@ int domain_unpause_by_systemcontroller(s
         prev = cmpxchg(&d->controller_pause_count, old, new);
     } while ( prev != old );
 
+    /*
+     * d->controller_pause_count is initialised to 1, and the toolstack is
+     * responsible for making one unpause hypercall when it wishes the guest
+     * to start running.
+     *
+     * All other toolstack operations should make a pair of pause/unpause
+     * calls and rely on the reference counting here.
+     *
+     * Creation is considered finished when the controller reference count
+     * first drops to 0.
+     */
+    if ( new == 0 )
+        d->creation_finished = true;
+
     domain_unpause(d);
 
     return 0;

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File 584fc649-fix-determining-when-domain-creation-is-complete.patch of Package xen (Revision 18d9f567aa76ad786ec2ce93bd88d638)

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