[xen staging] libxl: devd: Spawn QEMU for 9pfs

[patchbot@xxxxxxx]

commit 09abf1b61b45f65ebd017a246d887254dc50e0f8
Author:     Jason Andryuk <jandryuk@xxxxxxxxx>
AuthorDate: Sun Apr 7 16:58:09 2024 -0400
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Apr 11 16:41:09 2024 +0100

    libxl: devd: Spawn QEMU for 9pfs
    
    Add support for xl devd to support 9pfs in a domU.  devd need to spawn a
    pvqemu for the domain to service 9pfs as well as qdisk backends.  Rename
    num_qdisks to pvqemu_refcnt to be more generic.
    
    Keep the qdisk-backend-pid xenstore key as well as the disk-%u log file.
    They are externally visible, so they might be used by other tooling.
    
    Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libs/light/libxl_device.c   | 22 ++++++++++++----------
 tools/libs/light/libxl_dm.c       |  5 +++--
 tools/libs/light/libxl_internal.h |  4 ++--
 3 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/tools/libs/light/libxl_device.c b/tools/libs/light/libxl_device.c
index 6f0100d05e..a3d9f6f7df 100644
--- a/tools/libs/light/libxl_device.c
+++ b/tools/libs/light/libxl_device.c
@@ -1524,12 +1524,12 @@ static void device_complete(libxl__egc *egc, 
libxl__ao_device *aodev)
     libxl__nested_ao_free(aodev->ao);
 }
 
-static void qdisk_spawn_outcome(libxl__egc *egc, libxl__dm_spawn_state *dmss,
-                                int rc)
+static void qemu_xenpv_spawn_outcome(libxl__egc *egc,
+                                     libxl__dm_spawn_state *dmss, int rc)
 {
     STATE_AO_GC(dmss->spawn.ao);
 
-    LOGD(DEBUG, dmss->guest_domid, "qdisk backend spawn %s",
+    LOGD(DEBUG, dmss->guest_domid, "qemu xenpv backend spawn %s",
                 rc ? "failed" : "succeed");
 
     libxl__nested_ao_free(dmss->spawn.ao);
@@ -1552,7 +1552,7 @@ typedef struct libxl__ddomain_device {
  */
 typedef struct libxl__ddomain_guest {
     uint32_t domid;
-    int num_qdisks;
+    int pvqemu_refcnt;
     XEN_SLIST_HEAD(, struct libxl__ddomain_device) devices;
     XEN_SLIST_ENTRY(struct libxl__ddomain_guest) next;
 } libxl__ddomain_guest;
@@ -1646,15 +1646,16 @@ static int add_device(libxl__egc *egc, libxl__ao *ao,
 
     switch(dev->backend_kind) {
     case LIBXL__DEVICE_KIND_QDISK:
-        if (dguest->num_qdisks == 0) {
+    case LIBXL__DEVICE_KIND_9PFS:
+        if (dguest->pvqemu_refcnt == 0) {
             GCNEW(dmss);
             dmss->guest_domid = dev->domid;
             dmss->spawn.ao = ao;
-            dmss->callback = qdisk_spawn_outcome;
+            dmss->callback = qemu_xenpv_spawn_outcome;
 
-            libxl__spawn_qdisk_backend(egc, dmss);
+            libxl__spawn_qemu_xenpv_backend(egc, dmss);
         }
-        dguest->num_qdisks++;
+        dguest->pvqemu_refcnt++;
         break;
     default:
         GCNEW(aodev);
@@ -1685,8 +1686,9 @@ static int remove_device(libxl__egc *egc, libxl__ao *ao,
 
     switch(ddev->dev->backend_kind) {
     case LIBXL__DEVICE_KIND_QDISK:
-        if (--dguest->num_qdisks == 0) {
-            rc = libxl__destroy_qdisk_backend(gc, dev->domid);
+    case LIBXL__DEVICE_KIND_9PFS:
+        if (--dguest->pvqemu_refcnt == 0) {
+            rc = libxl__destroy_qemu_xenpv_backend(gc, dev->domid);
             if (rc)
                 goto out;
         }
diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index 0b03a7c747..567ae1ec7e 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -3381,7 +3381,8 @@ static void device_model_postconfig_done(libxl__egc *egc,
     dmss->callback(egc, dmss, rc);
 }
 
-void libxl__spawn_qdisk_backend(libxl__egc *egc, libxl__dm_spawn_state *dmss)
+void libxl__spawn_qemu_xenpv_backend(libxl__egc *egc,
+                                     libxl__dm_spawn_state *dmss)
 {
     STATE_AO_GC(dmss->spawn.ao);
     flexarray_t *dm_args, *dm_envs;
@@ -3471,7 +3472,7 @@ static int kill_device_model(libxl__gc *gc, const char 
*xs_path_pid)
 }
 
 /* Helper to destroy a Qdisk backend */
-int libxl__destroy_qdisk_backend(libxl__gc *gc, uint32_t domid)
+int libxl__destroy_qemu_xenpv_backend(libxl__gc *gc, uint32_t domid)
 {
     char *pid_path;
     int rc;
diff --git a/tools/libs/light/libxl_internal.h 
b/tools/libs/light/libxl_internal.h
index 803dbc1a03..3b58bb2d7f 100644
--- a/tools/libs/light/libxl_internal.h
+++ b/tools/libs/light/libxl_internal.h
@@ -4192,9 +4192,9 @@ _hidden char *libxl__stub_dm_name(libxl__gc *gc, const 
char * guest_name);
 
 /* Qdisk backend launch helpers */
 
-_hidden void libxl__spawn_qdisk_backend(libxl__egc *egc,
+_hidden void libxl__spawn_qemu_xenpv_backend(libxl__egc *egc,
                                         libxl__dm_spawn_state *dmss);
-_hidden int libxl__destroy_qdisk_backend(libxl__gc *gc, uint32_t domid);
+_hidden int libxl__destroy_qemu_xenpv_backend(libxl__gc *gc, uint32_t domid);
 
 /*----- Domain creation -----*/
 
--
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