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libxl: Add function to determine device model type

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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@suse.com>
This commit is contained in:
Jim Fehlig 2014-09-19 10:32:43 -06:00
parent 9320c3ff19
commit c5a003508f
2 changed files with 35 additions and 0 deletions
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32
src/libxl/libxl_conf.c
View File

@ -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)
{

3
src/libxl/libxl_conf.h
View File

@ -162,6 +162,9 @@ libxlDriverNodeGetInfo(libxlDriverPrivatePtr driver,
virCapsPtr
libxlMakeCapabilities(libxl_ctx *ctx);
int
libxlDomainGetEmulatorType(const virDomainDef *def);
int
libxlMakeDisk(virDomainDiskDefPtr l_dev, libxl_device_disk *x_dev);
int