[PATCH v3 2/4] tools/xendevicemodel: Introduce ..._get_ioreq_server_info_ext

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Add xendevicemodel_get_ioreq_server_info_ext() which additionally
returns output flags that XEN_DMOP_get_ioreq_server_info can now return.
Do not change signature of existing
xendevicemodel_get_ioreq_server_info() so existing users will not need
to be changed.

This advertises behavior change of "x86/msi: passthrough all MSI-X
vector ctrl writes to device model" patch.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
v3:
 - new patch

Should there be some HAVE_* #define in the header? Does this change
require soname bump (I hope it doesn't...).
---
 tools/include/xendevicemodel.h | 23 +++++++++++++++++++++++
 tools/libs/devicemodel/core.c  | 16 ++++++++++++++--
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/tools/include/xendevicemodel.h b/tools/include/xendevicemodel.h
index 797e0c6b2961..77a99e670551 100644
--- a/tools/include/xendevicemodel.h
+++ b/tools/include/xendevicemodel.h
@@ -72,6 +72,29 @@ int xendevicemodel_get_ioreq_server_info(
     evtchn_port_t *bufioreq_port);
 
 /**
+ * This function retrieves the necessary information to allow an
+ * emulator to use an IOREQ Server, including feature flags.
+ *
+ * @parm dmod a handle to an open devicemodel interface.
+ * @parm domid the domain id to be serviced
+ * @parm id the IOREQ Server id.
+ * @parm ioreq_gfn pointer to a xen_pfn_t to receive the synchronous ioreq
+ *                  gfn. (May be NULL if not required)
+ * @parm bufioreq_gfn pointer to a xen_pfn_t to receive the buffered ioreq
+ *                    gfn. (May be NULL if not required)
+ * @parm bufioreq_port pointer to a evtchn_port_t to receive the buffered
+ *                     ioreq event channel. (May be NULL if not required)
+ * @parm flags pointer to receive flags bitmask, see hvm/dm_op.h for details.
+ *             (May be NULL if not required)
+ * @return 0 on success, -1 on failure.
+ */
+int xendevicemodel_get_ioreq_server_info_ext(
+    xendevicemodel_handle *dmod, domid_t domid, ioservid_t id,
+    xen_pfn_t *ioreq_gfn, xen_pfn_t *bufioreq_gfn,
+    evtchn_port_t *bufioreq_port,
+    unsigned int *flags);
+
+/**
  * This function registers a range of memory or I/O ports for emulation.
  *
  * @parm dmod a handle to an open devicemodel interface.
diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c
index 8e619eeb0a1f..337622e608c2 100644
--- a/tools/libs/devicemodel/core.c
+++ b/tools/libs/devicemodel/core.c
@@ -189,10 +189,10 @@ int xendevicemodel_create_ioreq_server(
     return 0;
 }
 
-int xendevicemodel_get_ioreq_server_info(
+int xendevicemodel_get_ioreq_server_info_ext(
     xendevicemodel_handle *dmod, domid_t domid, ioservid_t id,
     xen_pfn_t *ioreq_gfn, xen_pfn_t *bufioreq_gfn,
-    evtchn_port_t *bufioreq_port)
+    evtchn_port_t *bufioreq_port, unsigned int *flags)
 {
     struct xen_dm_op op;
     struct xen_dm_op_get_ioreq_server_info *data;
@@ -226,9 +226,21 @@ int xendevicemodel_get_ioreq_server_info(
     if (bufioreq_port)
         *bufioreq_port = data->bufioreq_port;
 
+    if (flags)
+        *flags = data->flags;
+
     return 0;
 }
 
+int xendevicemodel_get_ioreq_server_info(
+    xendevicemodel_handle *dmod, domid_t domid, ioservid_t id,
+    xen_pfn_t *ioreq_gfn, xen_pfn_t *bufioreq_gfn,
+    evtchn_port_t *bufioreq_port)
+{
+    return xendevicemodel_get_ioreq_server_info_ext(
+        dmod, domid, id, ioreq_gfn, bufioreq_gfn, bufioreq_port, NULL);
+}
+
 int xendevicemodel_map_io_range_to_ioreq_server(
     xendevicemodel_handle *dmod, domid_t domid, ioservid_t id, int is_mmio,
     uint64_t start, uint64_t end)
-- 
git-series 0.9.1