[Xen-changelog] [xen master] common/domain: helpers to pause a domain while in context

[patchbot@xxxxxxx]

commit aace3f16d23a8aab93b768b4655c138ff4ba0aa9
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jul 24 13:23:59 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jul 24 13:23:59 2015 +0200

    common/domain: helpers to pause a domain while in context
    
    For use on codepaths which would need to use domain_pause() but might be in
    the target domain's context.  In the case that the target domain is in
    context, all other vcpus are paused.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
    Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/common/domain.c     |   28 ++++++++++++++++++++++++++++
 xen/include/xen/sched.h |    5 +++++
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 791166b..1b9fcfc 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1010,6 +1010,34 @@ int domain_unpause_by_systemcontroller(struct domain *d)
     return 0;
 }
 
+void domain_pause_except_self(struct domain *d)
+{
+    struct vcpu *v, *curr = current;
+
+    if ( curr->domain == d )
+    {
+        for_each_vcpu( d, v )
+            if ( likely(v != curr) )
+                vcpu_pause(v);
+    }
+    else
+        domain_pause(d);
+}
+
+void domain_unpause_except_self(struct domain *d)
+{
+    struct vcpu *v, *curr = current;
+
+    if ( curr->domain == d )
+    {
+        for_each_vcpu( d, v )
+            if ( likely(v != curr) )
+                vcpu_unpause(v);
+    }
+    else
+        domain_unpause(d);
+}
+
 int vcpu_reset(struct vcpu *v)
 {
     struct domain *d = v->domain;
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index b29d9e7..73d3bc8 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -804,6 +804,11 @@ static inline int 
domain_pause_by_systemcontroller_nosync(struct domain *d)
 {
     return __domain_pause_by_systemcontroller(d, domain_pause_nosync);
 }
+
+/* domain_pause() but safe against trying to pause current. */
+void domain_pause_except_self(struct domain *d);
+void domain_unpause_except_self(struct domain *d);
+
 void cpu_init(void);
 
 struct scheduler;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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