Add a XEN_VCPUAFFINITY_FORCE flag to xen_domctl_vcpuaffinity structure
which will allow to undo a SCHEDOP_pin_override in case of a driver
error of the hardware domain which didn't do the expected
SCHEDOP_pin_override with cpu < 0 which would have done the undo
operation.
Cc: Jan Beulich <jbeul...@suse.com>
Cc: Andrew Cooper <andrew.coop...@citrix.com>
Cc: Ian Jackson <ian.jack...@eu.citrix.com>
Cc: David Vrabel <david.vra...@citrix.com>
Cc: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Cc: Wei Liu <wei.l...@citrix.com>
Signed-off-by: Juergen Gross <jgr...@suse.com>
---
xen/common/domctl.c | 6 ++++++
xen/include/public/domctl.h | 3 +++
2 files changed, 9 insertions(+)
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index b34c0a1..e43904e 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -782,6 +782,12 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
break;
}
+ /* Undo a stuck SCHED_pin_override? */
+ if ( vcpuaff->flags & XEN_VCPUAFFINITY_FORCE )
+ vcpu_pin_override(v, -1);
+
+ ret = 0;
+
/*
* We both set a new affinity and report back to the caller what
* the scheduler will be effectively using.
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index a934318..076b1ae 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -307,6 +307,9 @@ struct xen_domctl_vcpuaffinity {
/* Set/get the soft affinity for vcpu */
#define _XEN_VCPUAFFINITY_SOFT 1
#define XEN_VCPUAFFINITY_SOFT (1U<<_XEN_VCPUAFFINITY_SOFT)
+ /* Undo SCHEDOP_pin_override */
+#define _XEN_VCPUAFFINITY_FORCE 2
+#define XEN_VCPUAFFINITY_FORCE (1U<<_XEN_VCPUAFFINITY_FORCE)
uint32_t flags;
/*
* IN/OUT variables.
--
2.6.2
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