[libvirt] [PATCH 2/2] libxl: allow an <emulator> to be selected in the domain config XML

[David Scott]

We cross-check the given path against the capabilties, and translate
it into a libxl_device_model_version.

Signed-off-by: David Scott <dave.scott at eu.citrix.com>
---
 src/libxl/libxl_conf.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 472d116..868d0cf 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -75,6 +75,11 @@ static const char* emulator_lib32_path [] = {
     EMULATOR_LIB32 EMULATOR_UPSTREAM,
 };
 
+static const libxl_device_model_version emulator_to_device_model [] = {
+    LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL,
+    LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN,
+};
+
 struct guest_arch {
     virArch arch;
     int bits;
@@ -833,6 +838,38 @@ libxlMakeCapabilities(libxl_ctx *ctx)
 }
 
 int
+libxlMakeEmulator(virDomainDefPtr def, libxl_domain_config *d_config)
+{
+    virArch hostarch;
+    const char *path;
+    int i;
+
+    /* No explicit override means use the default */
+    if (!def->emulator) {
+        return 0;
+    }
+
+    hostarch = virArchFromHost();
+
+    for (i = 0; i < emulator_last; ++i) {
+       path = ((hostarch == VIR_ARCH_X86_64) ?
+               emulator_lib64_path[i] :
+               emulator_lib32_path[i]);
+       if (STREQ(path, def->emulator)) {
+           d_config->b_info.device_model_version =
+               emulator_to_device_model[i];
+           return 0;
+       }
+    }
+
+    virReportError(VIR_ERR_INTERNAL_ERROR,
+                   _("libxenlight doesn't support emulator '%s'"),
+                   def->emulator);
+    return -1;
+}
+
+
+int
 libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
                        virDomainDefPtr def, libxl_domain_config *d_config)
 {
@@ -856,6 +893,10 @@ libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
         goto error;
     }
 
+    if (libxlMakeEmulator(def, d_config) < 0) {
+        goto error;
+    }
+
     d_config->on_reboot = def->onReboot;
     d_config->on_poweroff = def->onPoweroff;
     d_config->on_crash = def->onCrash;
-- 
1.7.1