Re: [Qemu-devel] [v2][PATCH 2/2] libxl: introduce gfx_passthru_kind

["Chen, Tiejun" <tiejun.chen@intel.com>]

>> +            case LIBXL_GFX_PASSTHRU_KIND_DEFAULT:
>> +                LOG(ERROR, "unable to detect required gfx_passthru_kind");
>
> In this case you will now have logged twice. I'd suggest logging only
> here and not in the helper.
>
>> +            default:
>
> And this case is subtly different to LIBXL_GFX_PASSTHRU_KIND_DEFAULT
> since it would indicate some sort of corruption. So, I would drop the
> logging on failure in libxl__detect_gfx_passthru_kind and here do:
>             case LIBXL_GFX_PASSTHRU_KIND_DEFAULT:
>                 LOG(ERROR, "unable to detect required gfx_passthru_kind");
>                 return NULL;
>             default:
>                 LOG(ERROR, "invalid value for gfx_passthru_kind");
>                 return NULL;
>


Okay, I update this patch. If this is fine to you I'd like to send this 
whole series.

---
  tools/libxl/libxl.h          |  6 ++++++
  tools/libxl/libxl_dm.c       | 36 +++++++++++++++++++++++++++++++++---
  tools/libxl/libxl_internal.h |  4 ++++
  tools/libxl/libxl_types.idl  |  6 ++++++
  tools/libxl/xl_cmdimpl.c     | 23 +++++++++++++++++++++--
  5 files changed, 70 insertions(+), 5 deletions(-)

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 6bbc52d..62b3ae5 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -720,6 +720,12 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, 
libxl_mac *src);
  #define LIBXL_HAVE_PSR_MBM 1
  #endif

+/*
+ * libxl_domain_build_info has the u.hvm.gfx_passthru_kind field and
+ * the libxl_gfx_passthru_kind enumeration is defined.
+*/
+#define LIBXL_HAVE_GFX_PASSTHRU_KIND
+
  typedef char **libxl_string_list;
  void libxl_string_list_dispose(libxl_string_list *sl);
  int libxl_string_list_length(const libxl_string_list *sl);
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 8599a6a..bf72103 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -409,6 +409,22 @@ static char *dm_spice_options(libxl__gc *gc,
      return opt;
  }

+static enum libxl_gfx_passthru_kind
+libxl__detect_gfx_passthru_kind(libxl__gc *gc,
+                                const libxl_domain_config *guest_config)
+{
+    const libxl_domain_build_info *b_info = &guest_config->b_info;
+
+    if (b_info->u.hvm.gfx_passthru_kind != LIBXL_GFX_PASSTHRU_KIND_DEFAULT)
+        return b_info->u.hvm.gfx_passthru_kind;
+
+    if (libxl__is_igd_vga_passthru(gc, guest_config)) {
+        return LIBXL_GFX_PASSTHRU_KIND_IGD;
+    }
+
+    return LIBXL_GFX_PASSTHRU_KIND_DEFAULT;
+}
+
  static char ** libxl__build_device_model_args_new(libxl__gc *gc,
                                          const char *dm, int guest_domid,
                                          const libxl_domain_config 
*guest_config,
@@ -710,9 +726,6 @@ static char ** 
libxl__build_device_model_args_new(libxl__gc *gc,
              flexarray_append(dm_args, "-net");
              flexarray_append(dm_args, "none");
          }
-        if (libxl_defbool_val(b_info->u.hvm.gfx_passthru)) {
-            flexarray_append(dm_args, "-gfx_passthru");
-        }
      } else {
          if (!sdl && !vnc) {
              flexarray_append(dm_args, "-nographic");
@@ -757,6 +770,23 @@ static char ** 
libxl__build_device_model_args_new(libxl__gc *gc,
                                              machinearg, max_ram_below_4g);
              }
          }
+
+        if (libxl_defbool_val(b_info->u.hvm.gfx_passthru)) {
+            enum libxl_gfx_passthru_kind gfx_passthru_kind =
+                            libxl__detect_gfx_passthru_kind(gc, 
guest_config);
+            switch (gfx_passthru_kind) {
+            case LIBXL_GFX_PASSTHRU_KIND_IGD:
+                machinearg = GCSPRINTF("%s,igd-passthru=on", machinearg);
+                break;
+            case LIBXL_GFX_PASSTHRU_KIND_DEFAULT:
+                LOG(ERROR, "unable to detect required gfx_passthru_kind");
+                return NULL;
+            default:
+                LOG(ERROR, "invalid value for gfx_passthru_kind");
+                return NULL;
+            }
+        }
+
          flexarray_append(dm_args, machinearg);
          for (i = 0; b_info->extra_hvm && b_info->extra_hvm[i] != NULL; 
i++)
              flexarray_append(dm_args, b_info->extra_hvm[i]);
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index c97c62d..26a01cb 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3632,6 +3632,10 @@ static inline void 
libxl__update_config_vtpm(libxl__gc *gc,
   */
  void libxl__bitmap_copy_best_effort(libxl__gc *gc, libxl_bitmap *dptr,
                                      const libxl_bitmap *sptr);
+
+bool libxl__is_igd_vga_passthru(libxl__gc *gc,
+                                const libxl_domain_config *d_config);
+
  #endif

  /*
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 47af340..76642a8 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -140,6 +140,11 @@ libxl_tsc_mode = Enumeration("tsc_mode", [
      (3, "native_paravirt"),
      ])

+libxl_gfx_passthru_kind = Enumeration("gfx_passthru_kind", [
+    (0, "default"),
+    (1, "igd"),
+    ])
+
  # Consistent with the values defined for HVM_PARAM_TIMER_MODE.
  libxl_timer_mode = Enumeration("timer_mode", [
      (-1, "unknown"),
@@ -430,6 +435,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
                                         ("spice", 
libxl_spice_info),

                                         ("gfx_passthru", 
libxl_defbool),
+                                       ("gfx_passthru_kind", 
libxl_gfx_passthru_kind),

                                         ("serial",           string),
                                         ("boot",             string),
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 5c40e84..5518759 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1953,8 +1953,27 @@ skip_vfb:
          xlu_cfg_replace_string (config, "spice_streaming_video",
                                  &b_info->u.hvm.spice.streaming_video, 0);
          xlu_cfg_get_defbool(config, "nographic", 
&b_info->u.hvm.nographic, 0);
-        xlu_cfg_get_defbool(config, "gfx_passthru",
-                            &b_info->u.hvm.gfx_passthru, 0);
+        if (!xlu_cfg_get_long(config, "gfx_passthru", &l, 1)) {
+            libxl_defbool_set(&b_info->u.hvm.gfx_passthru, l);
+        } else if (!xlu_cfg_get_string(config, "gfx_passthru", &buf, 0)) {
+            if (libxl_gfx_passthru_kind_from_string(buf,
+ 
&b_info->u.hvm.gfx_passthru_kind)) {
+                fprintf(stderr,
+                        "ERROR: invalid value \"%s\" for 
\"gfx_passthru\"\n",
+                        buf);
+                exit (1);
+            }
+            libxl_defbool_set(&b_info->u.hvm.gfx_passthru, true);
+        }
+        if (!xlu_cfg_get_string(config, "gfx_passthru_kind", &buf, 0)) {
+            if (libxl_gfx_passthru_kind_from_string(buf,
+ 
&b_info->u.hvm.gfx_passthru_kind)) {
+                fprintf(stderr,
+                        "ERROR: invalid value \"%s\" for 
\"gfx_passthru_kind\"\n",
+                        buf);
+                exit (1);
+            }
+        }
          switch (xlu_cfg_get_list_as_string_list(config, "serial",
 
&b_info->u.hvm.serial_list,
                                                  1))

Thanks
Tiejun