Base domain structure and public interface to support memory events.

Signed-off-by: Patrick Colp <Patrick.Colp@citrix.com>

xen/include/public/mem_event.h

@@ -0,0 +1,67 @@
+/******************************************************************************
+ * mem_event.h
+ *
+ * Memory event common structures.
+ *
+ * Copyright (c) 2009 by Citrix (R&D) Ltd. (Patrick Colp)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _XEN_PUBLIC_MEM_EVENT_H
+#define _XEN_PUBLIC_MEM_EVENT_H
+
+
+#include "xen.h"
+#include "io/ring.h"
+
+
+/* Memory event notification modes */
+#define MEM_EVENT_MODE_ASYNC    0
+#define MEM_EVENT_MODE_SYNC     (1 << 0)
+#define MEM_EVENT_MODE_SYNC_ALL (1 << 1)
+
+/* Memory event flags */
+#define MEM_EVENT_FLAG_PAUSED   (1 << 0)
+
+
+typedef struct mem_event_shared_page {
+    int port;
+} mem_event_shared_page_t;
+
+typedef struct mem_event_st {
+    unsigned long gfn;
+    unsigned long offset;
+    unsigned long p2mt;
+    int vcpu_id;
+    uint64_t flags;
+} mem_event_request_t, mem_event_response_t;
+
+
+DEFINE_RING_TYPES(mem_event, mem_event_request_t, mem_event_response_t);
+
+
+#endif
+
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */

xen/include/public/xen.h

@@ -146,6 +146,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
 #define VIRQ_XENOPROF   7  /* V. XenOprofile interrupt: new sample available */
 #define VIRQ_CON_RING   8  /* G. (DOM0) Bytes received on console            */
 #define VIRQ_PCPU_STATE 9  /* G. (DOM0) PCPU state changed                   */
+#define VIRQ_MEM_EVENT  10 /* G. (DOM0) A memory event has occured           */
 
 /* Architecture-specific VIRQ definitions. */
 #define VIRQ_ARCH_0    16

xen/include/xen/sched.h

@@ -20,6 +20,7 @@
 #include <xen/rcupdate.h>
 #include <xen/irq.h>
 #include <xen/mm.h>
+#include <public/mem_event.h>
 
 #ifdef CONFIG_COMPAT
 #include <compat/vcpu.h>
@@ -161,6 +162,32 @@ struct vcpu
 #define domain_unlock(d) spin_unlock_recursive(&(d)->domain_lock)
 #define domain_is_locked(d) spin_is_locked(&(d)->domain_lock)
 
+/* Memory event */
+struct mem_event_domain
+{
+    /* ring lock */
+    spinlock_t ring_lock;
+    /* shared page */
+    mem_event_shared_page_t *shared_page;
+    /* shared ring page */
+    void *ring_page;
+    /* front-end ring */
+    mem_event_front_ring_t front_ring;
+    /* if domain has been paused due to ring contention */
+    bool_t paused;
+    int paused_vcpus[MAX_VIRT_CPUS];
+    /* the memory event mode */
+    unsigned long mode;
+    /* domain to receive memory events */
+    struct domain *domain;
+    /* enabled? */
+    bool_t enabled;
+    /* event channel port (vcpu0 only) */
+    int xen_port;
+    /* tasklet */
+    struct tasklet tasklet;
+};
+ 
 struct domain
 {
     domid_t          domain_id;
@@ -277,6 +304,9 @@ struct domain
 
     /* Non-migratable and non-restoreable? */
     bool_t disable_migrate;
+
+    /* Memory paging support */
+    struct mem_event_domain mem_event;
 };
 
 struct domain_setup_info