From: Ian Campbell <ian.campbell@citrix.com>
Date: Fri, 29 Jan 2016 16:28:42 +0000 (+0000)
Subject: libxendevicemodel: support for marking memory dirty
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=55227469fdc11bc4ff66c926eeffed2e13c4924a;p=people%2Fliuw%2Flibxenctrl-split%2Fxen.git

libxendevicemodel: support for marking memory dirty

XXX underlying hypercall is not stable. Note this with the version of
    @@UNSTABLE. Also in order to build need to define __XEN_TOOLS__,
    use a separate source file to avoid accidentally poluting the
    stable bits of the library.

TBD replace hypercall with a stable variant and move to core.c +
    version as @@1.0

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---

diff --git a/tools/libs/devicemodel/Makefile b/tools/libs/devicemodel/Makefile
index 49599990f2..7410de35ca 100644
--- a/tools/libs/devicemodel/Makefile
+++ b/tools/libs/devicemodel/Makefile
@@ -13,7 +13,7 @@ CFLAGS   += $(CFLAGS_libxencall)
 LDLIBS   += $(LDLIBS_libxentoollog)
 LDLIBS   += $(LDLIBS_libxencall)
 
-SRCS-y   += core.c
+SRCS-y   += core.c core_unstable.c
 SRCS-y   += emuirq.c emuirq_unstable.c
 SRCS-y   += ioreqserv_unstable.c
 
@@ -26,6 +26,7 @@ LIB += libxendevicemodel.so
 endif
 
 # XXX These use unstable hypervisor interfaces
+core_unstable.o core_unstable.opic: CFLAGS += -D__XEN_TOOLS__
 emuirq_unstable.o emuirq_unstable.opic: CFLAGS += -D__XEN_TOOLS__
 ioreqserv_unstable.o ioreqserv_unstable.opic: CFLAGS += -D__XEN_TOOLS__
 
diff --git a/tools/libs/devicemodel/core_unstable.c b/tools/libs/devicemodel/core_unstable.c
new file mode 100644
index 0000000000..af9e0bc9a2
--- /dev/null
+++ b/tools/libs/devicemodel/core_unstable.c
@@ -0,0 +1,60 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "private.h"
+
+int xendevicemodel_mark_memory_region_dirty(xendevicemodel_handle *dm,
+                                            xen_pfn_t start, xen_pfn_t nr)
+{
+    xen_hvm_modified_memory_t *arg;
+    int ret = -1;
+
+    arg = xencall_alloc_buffer(dm->call, sizeof(*arg));
+    if ( arg == NULL )
+    {
+        LOGE(ERROR, "unable to allocate memory for modified memory hypercall");
+        goto err;
+    }
+
+    arg->domid     = dm->domid;
+    arg->first_pfn = start;
+    arg->nr        = nr;
+
+    ret = xencall2(dm->call, __HYPERVISOR_hvm_op,
+                   HVMOP_modified_memory,
+                   (uintptr_t)arg);
+
+    if ( ret )
+        LOGE(ERROR, "modified memory hypercall failed");
+
+    xencall_free_buffer(dm->call, arg);
+
+ err:
+    return ret;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libs/devicemodel/include/xendevicemodel.h b/tools/libs/devicemodel/include/xendevicemodel.h
index 42058b752d..0858d68e9f 100644
--- a/tools/libs/devicemodel/include/xendevicemodel.h
+++ b/tools/libs/devicemodel/include/xendevicemodel.h
@@ -144,6 +144,18 @@ int xendevicemodel_set_isa_irq_level(xendevicemodel_handle *dm,
 int xendevicemodel_inject_msi(xendevicemodel_handle *dm,
                               uint64_t addr, uint32_t data);
 
+/*
+ * Memory handling
+ * ===============
+ */
+
+/*
+ * Indicates to the hypervisor that emulation has resulting in the
+ * specified region of RAM has being modified.
+ */
+int xendevicemodel_mark_memory_region_dirty(xendevicemodel_handle *dm,
+                                            xen_pfn_t start, xen_pfn_t nr);
+
 /*
  * IOREQ Servers
  * =============
diff --git a/tools/libs/devicemodel/libxendevicemodel.map b/tools/libs/devicemodel/libxendevicemodel.map
index f544eadbad..ea183c0903 100644
--- a/tools/libs/devicemodel/libxendevicemodel.map
+++ b/tools/libs/devicemodel/libxendevicemodel.map
@@ -10,6 +10,8 @@ UNSTABLE {
 		xendevicemodel_unmap_pcidev_from_ioreq_server;
 		xendevicemodel_destroy_ioreq_server;
 
+		xendevicemodel_mark_memory_region_dirty;
+
 		xendevicemodel_inject_msi;
 };