[libvirt] [PATCH 3/5] libxl: Add function to determine device model type
This patch introduces a function to detect whether the specified
emulator is QEMU_XEN or QEMU_XEN_TRADITIONAL. Detection is based on the
string "Options specific to the Xen version:" in '$qemu -help' output.
AFAIK, the only qemu containing that string in help output is the
old Xen fork (aka qemu-dm).
Note:
QEMU_XEN means a qemu that contains support for Xen.
QEMU_XEN_TRADITIONAL means Xen's old forked qemu 0.10.2
Signed-off-by: Jim Fehlig <jfehlig(a)suse.com>
---
src/libxl/libxl_conf.c | 32 ++++++++++++++++++++++++++++++++
src/libxl/libxl_conf.h | 3 +++
2 files changed, 35 insertions(+)
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 0a781f9..ff3f6b5 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -40,6 +40,7 @@
#include "viralloc.h"
#include "viruuid.h"
#include "capabilities.h"
+#include "vircommand.h"
#include "libxl_domain.h"
#include "libxl_conf.h"
#include "libxl_utils.h"
@@ -796,6 +797,37 @@ libxlDiskSetDiscard(libxl_device_disk *x_disk, int discard)
}
+#define LIBXL_QEMU_DM_STR "Options specific to the Xen version:"
+
+int
+libxlDomainGetEmulatorType(const virDomainDef *def)
+{
+ int ret = LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN;
+ virCommandPtr cmd = NULL;
+ char *output = NULL;
+
+ if (STREQ(def->os.type, "hvm")) {
+ if (def->emulator) {
+ cmd = virCommandNew(def->emulator);
+
+ virCommandAddArgList(cmd, "-help", NULL);
+ virCommandSetOutputBuffer(cmd, &output);
+
+ if (virCommandRun(cmd, NULL) < 0)
+ goto cleanup;
+
+ if (strstr(output, LIBXL_QEMU_DM_STR))
+ ret = LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL;
+ }
+ }
+
+ cleanup:
+ VIR_FREE(output);
+ virCommandFree(cmd);
+ return ret;
+}
+
+
int
libxlMakeDisk(virDomainDiskDefPtr l_disk, libxl_device_disk *x_disk)
{
diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
index da66b4e..25f77ea 100644
--- a/src/libxl/libxl_conf.h
+++ b/src/libxl/libxl_conf.h
@@ -163,6 +163,9 @@ virCapsPtr
libxlMakeCapabilities(libxl_ctx *ctx);
int
+libxlDomainGetEmulatorType(const virDomainDef *def);
+
+int
libxlMakeDisk(virDomainDiskDefPtr l_dev, libxl_device_disk *x_dev);
int
libxlMakeNic(virDomainDefPtr def,
--
1.8.4.5