[PATCH] tools/xl: Add stubdomain_cmdline option to xl.cfg

[Scott Davis <scottwd@gmail.com>]

This adds an option to the xl domain configuration file syntax for specifying
a kernel command line for device-model stubdomains. It is intended for use with
Linux-based stubdomains.

Signed-off-by: Scott Davis <scott.davis@starlab.io>
---
 docs/man/xl.cfg.5.pod.in             | 4 ++++
 tools/golang/xenlight/helpers.gen.go | 3 +++
 tools/golang/xenlight/types.gen.go   | 1 +
 tools/libs/light/libxl_dm.c          | 1 +
 tools/libs/light/libxl_types.idl     | 1 +
 tools/xl/xl_parse.c                  | 2 ++
 6 files changed, 12 insertions(+)

diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in
index 56370a37db..6c777cad5c 100644
--- a/docs/man/xl.cfg.5.pod.in
+++ b/docs/man/xl.cfg.5.pod.in
@@ -2742,6 +2742,10 @@ In case of B<qemu-xen-traditional> it is expected to be MiniOS-based stubdomain
 image, in case of B<qemu-xen> it is expected to be Linux-based stubdomain
 kernel.
 
+=item B<stubdomain_cmdline="STRING">
+
+Append B<STRING> to the device-model stubdomain kernel command line.
+
 =item B<stubdomain_ramdisk="PATH">
 
 Override the path to the ramdisk image used as device-model stubdomain.
diff --git a/tools/golang/xenlight/helpers.gen.go b/tools/golang/xenlight/helpers.gen.go
index db82537b42..bfc1e7f312 100644
--- a/tools/golang/xenlight/helpers.gen.go
+++ b/tools/golang/xenlight/helpers.gen.go
@@ -1018,6 +1018,7 @@ return fmt.Errorf("converting field DeviceModelStubdomain: %v", err)
 }
 x.StubdomainMemkb = uint64(xc.stubdomain_memkb)
 x.StubdomainKernel = C.GoString(xc.stubdomain_kernel)
+x.StubdomainCmdline = C.GoString(xc.stubdomain_cmdline)
 x.StubdomainRamdisk = C.GoString(xc.stubdomain_ramdisk)
 x.DeviceModel = C.GoString(xc.device_model)
 x.DeviceModelSsidref = uint32(xc.device_model_ssidref)
@@ -1344,6 +1345,8 @@ return fmt.Errorf("converting field DeviceModelStubdomain: %v", err)
 xc.stubdomain_memkb = C.uint64_t(x.StubdomainMemkb)
 if x.StubdomainKernel != "" {
 xc.stubdomain_kernel = C.CString(x.StubdomainKernel)}
+if x.StubdomainCmdline != "" {
+xc.stubdomain_cmdline = C.CString(x.StubdomainCmdline)}
 if x.StubdomainRamdisk != "" {
 xc.stubdomain_ramdisk = C.CString(x.StubdomainRamdisk)}
 if x.DeviceModel != "" {
diff --git a/tools/golang/xenlight/types.gen.go b/tools/golang/xenlight/types.gen.go
index a214dd9df6..09a3bb67e2 100644
--- a/tools/golang/xenlight/types.gen.go
+++ b/tools/golang/xenlight/types.gen.go
@@ -483,6 +483,7 @@ DeviceModelVersion DeviceModelVersion
 DeviceModelStubdomain Defbool
 StubdomainMemkb uint64
 StubdomainKernel string
+StubdomainCmdline string
 StubdomainRamdisk string
 DeviceModel string
 DeviceModelSsidref uint32
diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index dbd3c7f278..2d54596834 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -2373,6 +2373,7 @@ void libxl__spawn_stub_dm(libxl__egc *egc, libxl__stub_dm_spawn_state *sdss)
     }
 
     stubdom_state->pv_kernel.path = guest_config->b_info.stubdomain_kernel;
+    stubdom_state->pv_cmdline = guest_config->b_info.stubdomain_cmdline;
     stubdom_state->pv_ramdisk.path = guest_config->b_info.stubdomain_ramdisk;
 
     /* fixme: this function can leak the stubdom if it fails */
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index f45adddab0..e782e15cf2 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -523,6 +523,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
     ("device_model_stubdomain", libxl_defbool),
     ("stubdomain_memkb",   MemKB),
     ("stubdomain_kernel",  string),
+    ("stubdomain_cmdline", string),
     ("stubdomain_ramdisk", string),
     # if you set device_model you must set device_model_version too
     ("device_model",     string),
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 9fb0791429..17dddb4cd5 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -2533,6 +2533,8 @@ skip_usbdev:
 
     xlu_cfg_replace_string (config, "stubdomain_kernel",
                             &b_info->stubdomain_kernel, 0);
+    xlu_cfg_replace_string (config, "stubdomain_cmdline",
+                            &b_info->stubdomain_cmdline, 0);
     xlu_cfg_replace_string (config, "stubdomain_ramdisk",
                             &b_info->stubdomain_ramdisk, 0);
     if (!xlu_cfg_get_long (config, "stubdomain_memory", &l, 0))
-- 
2.25.1