[Qemu-devel] [RFC PATCH 1/4] qemu-options: Add -filefd command line option

[Corey Bryant <coreyb@linux.vnet.ibm.com>]

This patch provides support for the -filefd command line option.
This option will allow passing of a filename and its corresponding
file descriptor to QEMU at exec time.

Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
---
 qemu-config.c   |   17 +++++++++++++++++
 qemu-config.h   |    1 +
 qemu-options.hx |   17 +++++++++++++++++
 3 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/qemu-config.c b/qemu-config.c
index be84a03..64afac6 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -613,6 +613,22 @@ QemuOptsList qemu_boot_opts = {
     },
 };
 
+QemuOptsList qemu_filefd_opts = {
+    .name = "filefd",
+    .head = QTAILQ_HEAD_INITIALIZER(qemu_filefd_opts.head),
+    .desc = {
+        {
+            .name = "file",
+            .type = QEMU_OPT_STRING,
+        }, {
+            .name = "fd",
+            .type = QEMU_OPT_NUMBER,
+        },
+        { /*End of list */ }
+    },
+};
+
+
 static QemuOptsList *vm_config_groups[32] = {
     &qemu_drive_opts,
     &qemu_chardev_opts,
@@ -628,6 +644,7 @@ static QemuOptsList *vm_config_groups[32] = {
     &qemu_machine_opts,
     &qemu_boot_opts,
     &qemu_iscsi_opts,
+    &qemu_filefd_opts,
     NULL,
 };
 
diff --git a/qemu-config.h b/qemu-config.h
index 6d7365d..6be54f1 100644
--- a/qemu-config.h
+++ b/qemu-config.h
@@ -4,6 +4,7 @@
 extern QemuOptsList qemu_fsdev_opts;
 extern QemuOptsList qemu_virtfs_opts;
 extern QemuOptsList qemu_spice_opts;
+extern QemuOptsList qemu_filefd_opts;
 
 QemuOptsList *qemu_find_opts(const char *group);
 void qemu_add_opts(QemuOptsList *list);
diff --git a/qemu-options.hx b/qemu-options.hx
index 8b66264..5f6782c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2743,6 +2743,23 @@ DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log,
     "-qtest-log LOG  specify tracing options\n",
     QEMU_ARCH_ALL)
 
+DEF("filefd", HAS_ARG, QEMU_OPTION_filefd,
+    "-filefd file=<filename>,fd=<fd>\n"
+    "                passes a filename and its corresponding file descriptor\n",
+    QEMU_ARCH_ALL)
+STEXI
+@item -filefd file=@var{filename},fd=@var{fd}
+@findex -filefd
+This is used when a management application opens a file on behalf of QEMU.
+Instead of performing an open, QEMU will use the fd passed on this option.
+@table @option
+@item file=@var{filename}
+The name of the file.
+@item fd=@var{fd}
+The file descriptor that corresponds to @var{filename}.
+@end table
+ETEXI
+
 HXCOMM This is the last statement. Insert new options before this line!
 STEXI
 @end table
-- 
1.7.7.6