Re: [Xen-devel] [PATCH v5] libxl: fix migration of PV and PVH domUs with and without qemu

[Olaf Hering <olaf@aepfle.de>]

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Am Tue, 14 May 2019 10:05:58 +0200
schrieb Olaf Hering <olaf@aepfle.de>:

> @@ -459,7 +461,9 @@ int libxl__domain_resume(libxl__gc *gc, uint32_t domid, int suspend_cancel)
>          goto out;
>      }
>  
> -    if (type == LIBXL_DOMAIN_TYPE_HVM) {
> +    if (type == LIBXL_DOMAIN_TYPE_HVM ||
> +        libxl__device_model_version_running(gc, domid) ==
> +        LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
>          rc = libxl__domain_resume_device_model(gc, domid);
>          if (rc) {
>              LOGD(ERROR, domid, "failed to resume device model:%d", rc);

I think this could be done like that instead, so that libxl__device_model_version_running
is called just once:

--- a/tools/libxl/libxl_dom_suspend.c
+++ b/tools/libxl/libxl_dom_suspend.c
@@ -444,6 +444,8 @@ int libxl__domain_resume_device_model(libxl__gc *gc, uint32_t domid)
         if (libxl__qmp_resume(gc, domid))
             return ERROR_FAIL;
         break;
+    case LIBXL_DEVICE_MODEL_VERSION_NONE:
+        break;
     default:
         return ERROR_INVAL;
     }
@@ -461,14 +463,10 @@ int libxl__domain_resume(libxl__gc *gc, uint32_t domid, int suspend_cancel)
         goto out;
     }
 
-    if (type == LIBXL_DOMAIN_TYPE_HVM ||
-        libxl__device_model_version_running(gc, domid) ==
-        LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
-        rc = libxl__domain_resume_device_model(gc, domid);
-        if (rc) {
-            LOGD(ERROR, domid, "failed to resume device model:%d", rc);
-            goto out;
-        }
+    rc = libxl__domain_resume_device_model(gc, domid);
+    if (rc) {
+        LOGD(ERROR, domid, "failed to resume device model:%d", rc);
+        goto out;
     }
 
     if (xc_domain_resume(CTX->xch, domid, suspend_cancel)) {


While it is easy for the resume path, doing the same in the suspend path
needs more changes. libxl__domain_suspend_device_model would need to receive
the callback and set it if a device model is active.

Should this be done on top of this change?

Olaf

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