[Xen-devel] [PATCH v5 p2 18/19] xl: Add new option dtdev

[Julien Grall <julien.grall@xxxxxxxxxx>]

From: Julien Grall <julien.grall@xxxxxxxxxx>

The option "dtdev" will be used to passthrough a device described
in the device tree to a guest.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>

---
    Changes in v5:
        - Drop "non-PCI" in the commit message
        - Add Ian's ack

    Changes in v4:
        - Typoes in the documentation
        - Wrap the line in xl_cmdimpl.c

    Changes in v2:
        - libxl_device_dt has been rename to libxl_device_dtdev
        - use xrealloc instead of realloc
---
 docs/man/xl.cfg.pod.5    |  5 +++++
 tools/libxl/xl_cmdimpl.c | 22 +++++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index ad95a9a..8357ebe 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -786,6 +786,11 @@ More information about Xen gfx_passthru feature is 
available
 on the XenVGAPassthrough L<http://wiki.xen.org/wiki/XenVGAPassthrough>
 wiki page.
 
+=item B<dtdev=[ "DTDEV_PATH", "DTDEV_PATH", ... ]>
+
+Specifies the host device tree nodes to passthrough to this guest. Each
+DTDEV_PATH is the absolute path in the device tree.
+
 =item B<ioports=[ "IOPORT_RANGE", "IOPORT_RANGE", ... ]>
 
 Allow guest to access specific legacy I/O ports. Each B<IOPORT_RANGE>
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index c2415ba..ed82b6a 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1169,7 +1169,7 @@ static void parse_config_data(const char *config_source,
     long l, vcpus = 0;
     XLU_Config *config;
     XLU_ConfigList *cpus, *vbds, *nics, *pcis, *cvfbs, *cpuids, *vtpms;
-    XLU_ConfigList *channels, *ioports, *irqs, *iomem, *viridian;
+    XLU_ConfigList *channels, *ioports, *irqs, *iomem, *viridian, *dtdevs;
     int num_ioports, num_irqs, num_iomem, num_cpus, num_viridian;
     int pci_power_mgmt = 0;
     int pci_msitranslate = 0;
@@ -1941,6 +1941,26 @@ skip_vfb:
             libxl_defbool_set(&b_info->u.pv.e820_host, true);
     }
 
+    if (!xlu_cfg_get_list (config, "dtdev", &dtdevs, 0, 0)) {
+        d_config->num_dtdevs = 0;
+        d_config->dtdevs = NULL;
+        for (i = 0; (buf = xlu_cfg_get_listitem(dtdevs, i)) != NULL; i++) {
+            libxl_device_dtdev *dtdev;
+
+            d_config->dtdevs = xrealloc(d_config->dtdevs,
+                                        sizeof (libxl_device_dtdev) * (i + 1));
+            dtdev = d_config->dtdevs + d_config->num_dtdevs;
+            libxl_device_dtdev_init(dtdev);
+
+            dtdev->path = strdup(buf);
+            if (dtdev->path == NULL) {
+                fprintf(stderr, "unable to duplicate string for dtdevs\n");
+                exit(-1);
+            }
+            d_config->num_dtdevs++;
+        }
+    }
+
     switch (xlu_cfg_get_list(config, "cpuid", &cpuids, 0, 1)) {
     case 0:
         {
-- 
2.1.4


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