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libvirt/src/qemu/qemu_capabilities.c
Jiri Denemark 2d76fea134 qemu: Use common helper when probing qemu capabilities 
QEMU binary is called several times when we probe different kinds of
capabilities the binary supports. This patch introduces new common
helper so that all probes use a consistent way of invoking qemu.
2012-04-27 12:09:32 +02:00

1646 lines
48 KiB
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/*
* qemu_capabilities.c: QEMU capabilities generation
*
* Copyright (C) 2006-2012 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "qemu_capabilities.h"
#include "memory.h"
#include "logging.h"
#include "virterror_internal.h"
#include "util.h"
#include "virfile.h"
#include "nodeinfo.h"
#include "cpu/cpu.h"
#include "domain_conf.h"
#include "qemu_conf.h"
#include "command.h"
#include "virnodesuspend.h"
#include <sys/stat.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <stdarg.h>
#define VIR_FROM_THIS VIR_FROM_QEMU
/* While not public, these strings must not change. They
* are used in domain status files which are read on
* daemon restarts
*/
VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
"kqemu", /* 0 */
"vnc-colon",
"no-reboot",
"drive",
"drive-boot",
"name", /* 5 */
"uuid",
"domid",
"vnet-hdr",
"migrate-kvm-stdio",
"migrate-qemu-tcp", /* 10 */
"migrate-qemu-exec",
"drive-cache-v2",
"kvm",
"drive-format",
"vga", /* 15 */
"0.10",
"pci-device",
"mem-path",
"drive-serial",
"xen-domid", /* 20 */
"migrate-qemu-unix",
"chardev",
"enable-kvm",
"monitor-json",
"balloon", /* 25 */
"device",
"sdl",
"smp-topology",
"netdev",
"rtc", /* 30 */
"vhost-net",
"rtc-td-hack",
"no-hpet",
"no-kvm-pit",
"tdf", /* 35 */
"pci-configfd",
"nodefconfig",
"boot-menu",
"enable-kqemu",
"fsdev", /* 40 */
"nesting",
"name-process",
"drive-readonly",
"smbios-type",
"vga-qxl", /* 45 */
"spice",
"vga-none",
"migrate-qemu-fd",
"boot-index",
"hda-duplex", /* 50 */
"drive-aio",
"pci-multibus",
"pci-bootindex",
"ccid-emulated",
"ccid-passthru", /* 55 */
"chardev-spicevmc",
"device-spicevmc",
"virtio-tx-alg",
"device-qxl-vga",
"pci-multifunction", /* 60 */
"virtio-blk-pci.ioeventfd",
"sga",
"virtio-blk-pci.event_idx",
"virtio-net-pci.event_idx",
"cache-directsync", /* 65 */
"piix3-usb-uhci",
"piix4-usb-uhci",
"usb-ehci",
"ich9-usb-ehci1",
"vt82c686b-usb-uhci", /* 70 */
"pci-ohci",
"usb-redir",
"usb-hub",
"no-shutdown",
"cache-unsafe", /* 75 */
"rombar",
"ich9-ahci",
"no-acpi",
"fsdev-readonly",
"virtio-blk-pci.scsi", /* 80 */
"blk-sg-io",
"drive-copy-on-read",
"cpu-host",
"fsdev-writeout",
"drive-iotune", /* 85 */
"system_wakeup",
"scsi-disk.channel",
"scsi-block",
"transaction",
"block-job-sync", /* 90 */
"block-job-async",
"scsi-cd",
"ide-cd",
);
struct qemu_feature_flags {
const char *name;
const int default_on;
const int toggle;
};
struct qemu_arch_info {
const char *arch;
int wordsize;
const char *machine;
const char *binary;
const char *altbinary;
const struct qemu_feature_flags *flags;
int nflags;
};
/* Feature flags for the architecture info */
static const struct qemu_feature_flags const arch_info_i686_flags [] = {
{ "pae", 1, 0 },
{ "nonpae", 1, 0 },
{ "acpi", 1, 1 },
{ "apic", 1, 0 },
};
static const struct qemu_feature_flags const arch_info_x86_64_flags [] = {
{ "acpi", 1, 1 },
{ "apic", 1, 0 },
};
/* The archicture tables for supported QEMU archs */
static const struct qemu_arch_info const arch_info_hvm[] = {
{ "i686", 32, NULL, "qemu",
"qemu-system-x86_64", arch_info_i686_flags, 4 },
{ "x86_64", 64, NULL, "qemu-system-x86_64",
NULL, arch_info_x86_64_flags, 2 },
{ "arm", 32, NULL, "qemu-system-arm", NULL, NULL, 0 },
{ "microblaze", 32, NULL, "qemu-system-microblaze", NULL, NULL, 0 },
{ "microblazeel", 32, NULL, "qemu-system-microblazeel", NULL, NULL, 0 },
{ "mips", 32, NULL, "qemu-system-mips", NULL, NULL, 0 },
{ "mipsel", 32, NULL, "qemu-system-mipsel", NULL, NULL, 0 },
{ "sparc", 32, NULL, "qemu-system-sparc", NULL, NULL, 0 },
{ "ppc", 32, NULL, "qemu-system-ppc", NULL, NULL, 0 },
{ "ppc64", 64, NULL, "qemu-system-ppc64", NULL, NULL, 0 },
{ "itanium", 64, NULL, "qemu-system-ia64", NULL, NULL, 0 },
{ "s390x", 64, NULL, "qemu-system-s390x", NULL, NULL, 0 },
};
static const struct qemu_arch_info const arch_info_xen[] = {
{ "i686", 32, "xenner", "xenner", NULL, arch_info_i686_flags, 4 },
{ "x86_64", 64, "xenner", "xenner", NULL, arch_info_x86_64_flags, 2 },
};
/* Format is:
* <machine> <desc> [(default)|(alias of <canonical>)]
*/
static int
qemuCapsParseMachineTypesStr(const char *output,
virCapsGuestMachinePtr **machines,
int *nmachines)
{
const char *p = output;
const char *next;
virCapsGuestMachinePtr *list = NULL;
int nitems = 0;
do {
const char *t;
virCapsGuestMachinePtr machine;
if ((next = strchr(p, '\n')))
++next;
if (STRPREFIX(p, "Supported machines are:"))
continue;
if (!(t = strchr(p, ' ')) || (next && t >= next))
continue;
if (VIR_ALLOC(machine) < 0)
goto no_memory;
if (!(machine->name = strndup(p, t - p))) {
VIR_FREE(machine);
goto no_memory;
}
if (VIR_REALLOC_N(list, nitems + 1) < 0) {
VIR_FREE(machine->name);
VIR_FREE(machine);
goto no_memory;
}
p = t;
if (!(t = strstr(p, "(default)")) || (next && t >= next)) {
list[nitems++] = machine;
} else {
/* put the default first in the list */
memmove(list + 1, list, sizeof(*list) * nitems);
list[0] = machine;
nitems++;
}
if ((t = strstr(p, "(alias of ")) && (!next || t < next)) {
p = t + strlen("(alias of ");
if (!(t = strchr(p, ')')) || (next && t >= next))
continue;
if (!(machine->canonical = strndup(p, t - p)))
goto no_memory;
}
} while ((p = next));
*machines = list;
*nmachines = nitems;
return 0;
no_memory:
virReportOOMError();
virCapabilitiesFreeMachines(list, nitems);
return -1;
}
int
qemuCapsProbeMachineTypes(const char *binary,
virBitmapPtr qemuCaps,
virCapsGuestMachinePtr **machines,
int *nmachines)
{
char *output;
int ret = -1;
virCommandPtr cmd;
int status;
/* Make sure the binary we are about to try exec'ing exists.
* Technically we could catch the exec() failure, but that's
* in a sub-process so it's hard to feed back a useful error.
*/
if (!virFileIsExecutable(binary)) {
virReportSystemError(errno, _("Cannot find QEMU binary %s"), binary);
return -1;
}
cmd = qemuCapsProbeCommand(binary, qemuCaps);
virCommandAddArgList(cmd, "-M", "?", NULL);
virCommandSetOutputBuffer(cmd, &output);
/* Ignore failure from older qemu that did not understand '-M ?'. */
if (virCommandRun(cmd, &status) < 0)
goto cleanup;
if (qemuCapsParseMachineTypesStr(output, machines, nmachines) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
static int
qemuCapsGetOldMachinesFromInfo(virCapsGuestDomainInfoPtr info,
const char *emulator,
time_t emulator_mtime,
virCapsGuestMachinePtr **machines,
int *nmachines)
{
virCapsGuestMachinePtr *list;
int i;
if (!info->nmachines)
return 0;
if (!info->emulator || !STREQ(emulator, info->emulator))
return 0;
if (emulator_mtime != info->emulator_mtime) {
VIR_DEBUG("mtime on %s has changed, refreshing machine types",
info->emulator);
return 0;
}
if (VIR_ALLOC_N(list, info->nmachines) < 0) {
virReportOOMError();
return 0;
}
for (i = 0; i < info->nmachines; i++) {
if (VIR_ALLOC(list[i]) < 0) {
goto no_memory;
}
if (info->machines[i]->name &&
!(list[i]->name = strdup(info->machines[i]->name))) {
goto no_memory;
}
if (info->machines[i]->canonical &&
!(list[i]->canonical = strdup(info->machines[i]->canonical))) {
goto no_memory;
}
}
*machines = list;
*nmachines = info->nmachines;
return 1;
no_memory:
virReportOOMError();
virCapabilitiesFreeMachines(list, info->nmachines);
return 0;
}
static int
qemuCapsGetOldMachines(const char *ostype,
const char *arch,
int wordsize,
const char *emulator,
time_t emulator_mtime,
virCapsPtr old_caps,
virCapsGuestMachinePtr **machines,
int *nmachines)
{
int i;
for (i = 0; i < old_caps->nguests; i++) {
virCapsGuestPtr guest = old_caps->guests[i];
int j;
if (!STREQ(ostype, guest->ostype) ||
!STREQ(arch, guest->arch.name) ||
wordsize != guest->arch.wordsize)
continue;
for (j = 0; j < guest->arch.ndomains; j++) {
virCapsGuestDomainPtr dom = guest->arch.domains[j];
if (qemuCapsGetOldMachinesFromInfo(&dom->info,
emulator, emulator_mtime,
machines, nmachines))
return 1;
}
if (qemuCapsGetOldMachinesFromInfo(&guest->arch.defaultInfo,
emulator, emulator_mtime,
machines, nmachines))
return 1;
}
return 0;
}
typedef int
(*qemuCapsParseCPUModels)(const char *output,
unsigned int *retcount,
const char ***retcpus);
/* Format:
* <arch> <model>
* qemu-0.13 encloses some model names in []:
* <arch> [<model>]
*/
static int
qemuCapsParseX86Models(const char *output,
unsigned int *retcount,
const char ***retcpus)
{
const char *p = output;
const char *next;
unsigned int count = 0;
const char **cpus = NULL;
int i;
do {
const char *t;
if ((next = strchr(p, '\n')))
next++;
if (!(t = strchr(p, ' ')) || (next && t >= next))
continue;
if (!STRPREFIX(p, "x86"))
continue;
p = t;
while (*p == ' ')
p++;
if (*p == '\0' || *p == '\n')
continue;
if (retcpus) {
unsigned int len;
if (VIR_REALLOC_N(cpus, count + 1) < 0) {
virReportOOMError();
goto error;
}
if (next)
len = next - p - 1;
else
len = strlen(p);
if (len > 2 && *p == '[' && p[len - 1] == ']') {
p++;
len -= 2;
}
if (!(cpus[count] = strndup(p, len))) {
virReportOOMError();
goto error;
}
}
count++;
} while ((p = next));
if (retcount)
*retcount = count;
if (retcpus)
*retcpus = cpus;
return 0;
error:
if (cpus) {
for (i = 0; i < count; i++)
VIR_FREE(cpus[i]);
}
VIR_FREE(cpus);
return -1;
}
/* ppc64 parser.
* Format : PowerPC <machine> <description>
*/
static int
qemuCapsParsePPCModels(const char *output,
unsigned int *retcount,
const char ***retcpus)
{
const char *p = output;
const char *next;
unsigned int count = 0;
const char **cpus = NULL;
int i, ret = -1;
do {
const char *t;
if ((next = strchr(p, '\n')))
next++;
if (!STRPREFIX(p, "PowerPC "))
continue;
/* Skip the preceding sub-string "PowerPC " */
p += 8;
/*Malformed string, does not obey the format 'PowerPC <model> <desc>'*/
if (!(t = strchr(p, ' ')) || (next && t >= next))
continue;
if (*p == '\0')
break;
if (*p == '\n')
continue;
if (retcpus) {
unsigned int len;
if (VIR_REALLOC_N(cpus, count + 1) < 0) {
virReportOOMError();
goto cleanup;
}
len = t - p - 1;
if (!(cpus[count] = strndup(p, len))) {
virReportOOMError();
goto cleanup;
}
}
count++;
} while ((p = next));
if (retcount)
*retcount = count;
if (retcpus) {
*retcpus = cpus;
cpus = NULL;
}
ret = 0;
cleanup:
if (cpus) {
for (i = 0; i < count; i++)
VIR_FREE(cpus[i]);
VIR_FREE(cpus);
}
return ret;
}
int
qemuCapsProbeCPUModels(const char *qemu,
virBitmapPtr qemuCaps,
const char *arch,
unsigned int *count,
const char ***cpus)
{
char *output = NULL;
int ret = -1;
qemuCapsParseCPUModels parse;
virCommandPtr cmd;
if (count)
*count = 0;
if (cpus)
*cpus = NULL;
if (STREQ(arch, "i686") || STREQ(arch, "x86_64"))
parse = qemuCapsParseX86Models;
else if (STREQ(arch, "ppc64"))
parse = qemuCapsParsePPCModels;
else {
VIR_DEBUG("don't know how to parse %s CPU models", arch);
return 0;
}
cmd = qemuCapsProbeCommand(qemu, qemuCaps);
virCommandAddArgList(cmd, "-cpu", "?", NULL);
virCommandSetOutputBuffer(cmd, &output);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (parse(output, count, cpus) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
static int
qemuCapsInitGuest(virCapsPtr caps,
virCapsPtr old_caps,
const char *hostmachine,
const struct qemu_arch_info *info,
int hvm)
{
virCapsGuestPtr guest;
int i;
int haskvm = 0;
int haskqemu = 0;
char *kvmbin = NULL;
char *binary = NULL;
time_t binary_mtime;
virCapsGuestMachinePtr *machines = NULL;
int nmachines = 0;
struct stat st;
unsigned int ncpus;
virBitmapPtr qemuCaps = NULL;
int ret = -1;
/* Check for existance of base emulator, or alternate base
* which can be used with magic cpu choice
*/
binary = virFindFileInPath(info->binary);
if (binary == NULL || !virFileIsExecutable(binary)) {
VIR_FREE(binary);
binary = virFindFileInPath(info->altbinary);
}
/* Can use acceleration for KVM/KQEMU if
* - host & guest arches match
* Or
* - hostarch is x86_64 and guest arch is i686
* The latter simply needs "-cpu qemu32"
*/
if (STREQ(info->arch, hostmachine) ||
(STREQ(hostmachine, "x86_64") && STREQ(info->arch, "i686"))) {
if (access("/dev/kvm", F_OK) == 0) {
const char *const kvmbins[] = { "/usr/libexec/qemu-kvm", /* RHEL */
"qemu-kvm", /* Fedora */
"kvm" }; /* Upstream .spec */
for (i = 0; i < ARRAY_CARDINALITY(kvmbins); ++i) {
kvmbin = virFindFileInPath(kvmbins[i]);
if (!kvmbin)
continue;
haskvm = 1;
if (!binary)
binary = kvmbin;
break;
}
}
if (access("/dev/kqemu", F_OK) == 0)
haskqemu = 1;
}
if (!binary)
return 0;
/* Ignore binary if extracting version info fails */
if (qemuCapsExtractVersionInfo(binary, info->arch, NULL, &qemuCaps) < 0) {
ret = 0;
goto cleanup;
}
if (stat(binary, &st) == 0) {
binary_mtime = st.st_mtime;
} else {
char ebuf[1024];
VIR_WARN("Failed to stat %s, most peculiar : %s",
binary, virStrerror(errno, ebuf, sizeof(ebuf)));
binary_mtime = 0;
}
if (info->machine) {
virCapsGuestMachinePtr machine;
if (VIR_ALLOC(machine) < 0) {
goto no_memory;
}
if (!(machine->name = strdup(info->machine))) {
VIR_FREE(machine);
goto no_memory;
}
nmachines = 1;
if (VIR_ALLOC_N(machines, nmachines) < 0) {
VIR_FREE(machine->name);
VIR_FREE(machine);
goto no_memory;
}
machines[0] = machine;
} else {
int probe = 1;
if (old_caps && binary_mtime)
probe = !qemuCapsGetOldMachines(hvm ? "hvm" : "xen", info->arch,
info->wordsize, binary, binary_mtime,
old_caps, &machines, &nmachines);
if (probe &&
qemuCapsProbeMachineTypes(binary, qemuCaps,
&machines, &nmachines) < 0)
goto error;
}
/* We register kvm as the base emulator too, since we can
* just give -no-kvm to disable acceleration if required */
if ((guest = virCapabilitiesAddGuest(caps,
hvm ? "hvm" : "xen",
info->arch,
info->wordsize,
binary,
NULL,
nmachines,
machines)) == NULL)
goto error;
machines = NULL;
nmachines = 0;
guest->arch.defaultInfo.emulator_mtime = binary_mtime;
if (caps->host.cpu &&
qemuCapsProbeCPUModels(binary, NULL, info->arch, &ncpus, NULL) == 0 &&
ncpus > 0 &&
!virCapabilitiesAddGuestFeature(guest, "cpuselection", 1, 0))
goto error;
if (qemuCapsGet(qemuCaps, QEMU_CAPS_BOOTINDEX) &&
!virCapabilitiesAddGuestFeature(guest, "deviceboot", 1, 0))
goto error;
if (hvm) {
if (virCapabilitiesAddGuestDomain(guest,
"qemu",
NULL,
NULL,
0,
NULL) == NULL)
goto error;
if (haskqemu &&
virCapabilitiesAddGuestDomain(guest,
"kqemu",
NULL,
NULL,
0,
NULL) == NULL)
goto error;
if (haskvm) {
virCapsGuestDomainPtr dom;
if (stat(kvmbin, &st) == 0) {
binary_mtime = st.st_mtime;
} else {
char ebuf[1024];
VIR_WARN("Failed to stat %s, most peculiar : %s",
binary, virStrerror(errno, ebuf, sizeof(ebuf)));
binary_mtime = 0;
}
if (!STREQ(binary, kvmbin)) {
int probe = 1;
if (old_caps && binary_mtime)
probe = !qemuCapsGetOldMachines("hvm", info->arch, info->wordsize,
kvmbin, binary_mtime,
old_caps, &machines, &nmachines);
if (probe &&
qemuCapsProbeMachineTypes(kvmbin, qemuCaps,
&machines, &nmachines) < 0)
goto error;
}
if ((dom = virCapabilitiesAddGuestDomain(guest,
"kvm",
kvmbin,
NULL,
nmachines,
machines)) == NULL) {
goto error;
}
machines = NULL;
nmachines = 0;
dom->info.emulator_mtime = binary_mtime;
}
} else {
if (virCapabilitiesAddGuestDomain(guest,
"kvm",
NULL,
NULL,
0,
NULL) == NULL)
goto error;
}
if (info->nflags) {
for (i = 0 ; i < info->nflags ; i++) {
if (virCapabilitiesAddGuestFeature(guest,
info->flags[i].name,
info->flags[i].default_on,
info->flags[i].toggle) == NULL)
goto error;
}
}
ret = 0;
cleanup:
if (binary == kvmbin) {
/* don't double free */
VIR_FREE(binary);
} else {
VIR_FREE(binary);
VIR_FREE(kvmbin);
}
qemuCapsFree(qemuCaps);
return ret;
no_memory:
virReportOOMError();
error:
virCapabilitiesFreeMachines(machines, nmachines);
goto cleanup;
}
static int
qemuCapsInitCPU(virCapsPtr caps,
const char *arch)
{
virCPUDefPtr cpu = NULL;
union cpuData *data = NULL;
virNodeInfo nodeinfo;
int ret = -1;
if (VIR_ALLOC(cpu) < 0
|| !(cpu->arch = strdup(arch))) {
virReportOOMError();
goto error;
}
if (nodeGetInfo(NULL, &nodeinfo))
goto error;
cpu->type = VIR_CPU_TYPE_HOST;
cpu->sockets = nodeinfo.sockets;
cpu->cores = nodeinfo.cores;
cpu->threads = nodeinfo.threads;
if (!(data = cpuNodeData(arch))
|| cpuDecode(cpu, data, NULL, 0, NULL) < 0)
goto error;
caps->host.cpu = cpu;
ret = 0;
cleanup:
cpuDataFree(arch, data);
return ret;
error:
virCPUDefFree(cpu);
goto cleanup;
}
static int qemuDefaultConsoleType(const char *ostype ATTRIBUTE_UNUSED)
{
return VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL;
}
virCapsPtr qemuCapsInit(virCapsPtr old_caps)
{
struct utsname utsname;
virCapsPtr caps;
int i;
char *xenner = NULL;
/* Really, this never fails - look at the man-page. */
uname (&utsname);
if ((caps = virCapabilitiesNew(utsname.machine,
1, 1)) == NULL)
goto no_memory;
/* Using KVM's mac prefix for QEMU too */
virCapabilitiesSetMacPrefix(caps, (unsigned char[]){ 0x52, 0x54, 0x00 });
/* Some machines have problematic NUMA toplogy causing
* unexpected failures. We don't want to break the QEMU
* driver in this scenario, so log errors & carry on
*/
if (nodeCapsInitNUMA(caps) < 0) {
virCapabilitiesFreeNUMAInfo(caps);
VIR_WARN("Failed to query host NUMA topology, disabling NUMA capabilities");
}
if (old_caps == NULL || old_caps->host.cpu == NULL) {
if (qemuCapsInitCPU(caps, utsname.machine) < 0)
VIR_WARN("Failed to get host CPU");
}
else {
caps->host.cpu = old_caps->host.cpu;
old_caps->host.cpu = NULL;
}
/* Add the power management features of the host */
if (virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
VIR_WARN("Failed to get host power management capabilities");
virCapabilitiesAddHostMigrateTransport(caps,
"tcp");
/* First the pure HVM guests */
for (i = 0 ; i < ARRAY_CARDINALITY(arch_info_hvm) ; i++)
if (qemuCapsInitGuest(caps, old_caps,
utsname.machine,
&arch_info_hvm[i], 1) < 0)
goto no_memory;
/* Then possibly the Xen paravirt guests (ie Xenner */
xenner = virFindFileInPath("xenner");
if (xenner != NULL && virFileIsExecutable(xenner) == 0 &&
access("/dev/kvm", F_OK) == 0) {
for (i = 0 ; i < ARRAY_CARDINALITY(arch_info_xen) ; i++)
/* Allow Xen 32-on-32, 32-on-64 and 64-on-64 */
if (STREQ(arch_info_xen[i].arch, utsname.machine) ||
(STREQ(utsname.machine, "x86_64") &&
STREQ(arch_info_xen[i].arch, "i686"))) {
if (qemuCapsInitGuest(caps, old_caps,
utsname.machine,
&arch_info_xen[i], 0) < 0)
goto no_memory;
}
}
VIR_FREE(xenner);
/* QEMU Requires an emulator in the XML */
virCapabilitiesSetEmulatorRequired(caps);
caps->defaultConsoleTargetType = qemuDefaultConsoleType;
return caps;
no_memory:
VIR_FREE(xenner);
virCapabilitiesFree(caps);
return NULL;
}
static int
qemuCapsComputeCmdFlags(const char *help,
unsigned int version,
unsigned int is_kvm,
unsigned int kvm_version,
virBitmapPtr flags,
bool check_yajl ATTRIBUTE_UNUSED)
{
const char *p;
const char *fsdev;
if (strstr(help, "-no-kqemu"))
qemuCapsSet(flags, QEMU_CAPS_KQEMU);
if (strstr(help, "-enable-kqemu"))
qemuCapsSet(flags, QEMU_CAPS_ENABLE_KQEMU);
if (strstr(help, "-no-kvm"))
qemuCapsSet(flags, QEMU_CAPS_KVM);
if (strstr(help, "-enable-kvm"))
qemuCapsSet(flags, QEMU_CAPS_ENABLE_KVM);
if (strstr(help, "-no-reboot"))
qemuCapsSet(flags, QEMU_CAPS_NO_REBOOT);
if (strstr(help, "-name")) {
qemuCapsSet(flags, QEMU_CAPS_NAME);
if (strstr(help, ",process="))
qemuCapsSet(flags, QEMU_CAPS_NAME_PROCESS);
}
if (strstr(help, "-uuid"))
qemuCapsSet(flags, QEMU_CAPS_UUID);
if (strstr(help, "-xen-domid"))
qemuCapsSet(flags, QEMU_CAPS_XEN_DOMID);
else if (strstr(help, "-domid"))
qemuCapsSet(flags, QEMU_CAPS_DOMID);
if (strstr(help, "-drive")) {
const char *cache = strstr(help, "cache=");
qemuCapsSet(flags, QEMU_CAPS_DRIVE);
if (cache && (p = strchr(cache, ']'))) {
if (memmem(cache, p - cache, "on|off", sizeof("on|off") - 1) == NULL)
qemuCapsSet(flags, QEMU_CAPS_DRIVE_CACHE_V2);
if (memmem(cache, p - cache, "directsync", sizeof("directsync") - 1))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_CACHE_DIRECTSYNC);
if (memmem(cache, p - cache, "unsafe", sizeof("unsafe") - 1))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_CACHE_UNSAFE);
}
if (strstr(help, "format="))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_FORMAT);
if (strstr(help, "readonly="))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_READONLY);
if (strstr(help, "aio=threads|native"))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_AIO);
if (strstr(help, "copy-on-read=on|off"))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_COPY_ON_READ);
if (strstr(help, "bps="))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_IOTUNE);
}
if ((p = strstr(help, "-vga")) && !strstr(help, "-std-vga")) {
const char *nl = strstr(p, "\n");
qemuCapsSet(flags, QEMU_CAPS_VGA);
if (strstr(p, "|qxl"))
qemuCapsSet(flags, QEMU_CAPS_VGA_QXL);
if ((p = strstr(p, "|none")) && p < nl)
qemuCapsSet(flags, QEMU_CAPS_VGA_NONE);
}
if (strstr(help, "-spice"))
qemuCapsSet(flags, QEMU_CAPS_SPICE);
if (strstr(help, "boot=on"))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_BOOT);
if (strstr(help, "serial=s"))
qemuCapsSet(flags, QEMU_CAPS_DRIVE_SERIAL);
if (strstr(help, "-pcidevice"))
qemuCapsSet(flags, QEMU_CAPS_PCIDEVICE);
if (strstr(help, "-mem-path"))
qemuCapsSet(flags, QEMU_CAPS_MEM_PATH);
if (strstr(help, "-chardev")) {
qemuCapsSet(flags, QEMU_CAPS_CHARDEV);
if (strstr(help, "-chardev spicevmc"))
qemuCapsSet(flags, QEMU_CAPS_CHARDEV_SPICEVMC);
}
if (strstr(help, "-balloon"))
qemuCapsSet(flags, QEMU_CAPS_BALLOON);
if (strstr(help, "-device")) {
qemuCapsSet(flags, QEMU_CAPS_DEVICE);
/*
* When -device was introduced, qemu already supported drive's
* readonly option but didn't advertise that.
*/
qemuCapsSet(flags, QEMU_CAPS_DRIVE_READONLY);
}
if (strstr(help, "-nodefconfig"))
qemuCapsSet(flags, QEMU_CAPS_NODEFCONFIG);
/* The trailing ' ' is important to avoid a bogus match */
if (strstr(help, "-rtc "))
qemuCapsSet(flags, QEMU_CAPS_RTC);
/* to wit */
if (strstr(help, "-rtc-td-hack"))
qemuCapsSet(flags, QEMU_CAPS_RTC_TD_HACK);
if (strstr(help, "-no-hpet"))
qemuCapsSet(flags, QEMU_CAPS_NO_HPET);
if (strstr(help, "-no-acpi"))
qemuCapsSet(flags, QEMU_CAPS_NO_ACPI);
if (strstr(help, "-no-kvm-pit-reinjection"))
qemuCapsSet(flags, QEMU_CAPS_NO_KVM_PIT);
if (strstr(help, "-tdf"))
qemuCapsSet(flags, QEMU_CAPS_TDF);
if (strstr(help, "-enable-nesting"))
qemuCapsSet(flags, QEMU_CAPS_NESTING);
if (strstr(help, ",menu=on"))
qemuCapsSet(flags, QEMU_CAPS_BOOT_MENU);
if ((fsdev = strstr(help, "-fsdev"))) {
qemuCapsSet(flags, QEMU_CAPS_FSDEV);
if (strstr(fsdev, "readonly"))
qemuCapsSet(flags, QEMU_CAPS_FSDEV_READONLY);
if (strstr(fsdev, "writeout"))
qemuCapsSet(flags, QEMU_CAPS_FSDEV_WRITEOUT);
}
if (strstr(help, "-smbios type"))
qemuCapsSet(flags, QEMU_CAPS_SMBIOS_TYPE);
if (strstr(help, "-netdev")) {
/* Disable -netdev on 0.12 since although it exists,
* the corresponding netdev_add/remove monitor commands
* do not, and we need them to be able to do hotplug.
* But see below about RHEL build. */
if (version >= 13000)
qemuCapsSet(flags, QEMU_CAPS_NETDEV);
}
if (strstr(help, "-sdl"))
qemuCapsSet(flags, QEMU_CAPS_SDL);
if (strstr(help, "cores=") &&
strstr(help, "threads=") &&
strstr(help, "sockets="))
qemuCapsSet(flags, QEMU_CAPS_SMP_TOPOLOGY);
if (version >= 9000)
qemuCapsSet(flags, QEMU_CAPS_VNC_COLON);
if (is_kvm && (version >= 10000 || kvm_version >= 74))
qemuCapsSet(flags, QEMU_CAPS_VNET_HDR);
if (strstr(help, ",vhost=")) {
qemuCapsSet(flags, QEMU_CAPS_VHOST_NET);
}
/* Do not use -no-shutdown if qemu doesn't support it or SIGTERM handling
* is most likely buggy when used with -no-shutdown (which applies for qemu
* 0.14.* and 0.15.0)
*/
if (strstr(help, "-no-shutdown") && (version < 14000 || version > 15000))
qemuCapsSet(flags, QEMU_CAPS_NO_SHUTDOWN);
/*
* Handling of -incoming arg with varying features
* -incoming tcp (kvm >= 79, qemu >= 0.10.0)
* -incoming exec (kvm >= 80, qemu >= 0.10.0)
* -incoming unix (qemu >= 0.12.0)
* -incoming fd (qemu >= 0.12.0)
* -incoming stdio (all earlier kvm)
*
* NB, there was a pre-kvm-79 'tcp' support, but it
* was broken, because it blocked the monitor console
* while waiting for data, so pretend it doesn't exist
*/
if (version >= 10000) {
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_TCP);
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_EXEC);
if (version >= 12000) {
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_UNIX);
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_FD);
}
} else if (kvm_version >= 79) {
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_TCP);
if (kvm_version >= 80)
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_QEMU_EXEC);
} else if (kvm_version > 0) {
qemuCapsSet(flags, QEMU_CAPS_MIGRATE_KVM_STDIO);
}
if (version >= 10000)
qemuCapsSet(flags, QEMU_CAPS_0_10);
if (version >= 11000)
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_SG_IO);
/* While JSON mode was available in 0.12.0, it was too
* incomplete to contemplate using. The 0.13.0 release
* is good enough to use, even though it lacks one or
* two features. This is also true of versions of qemu
* built for RHEL, labeled 0.12.1, but with extra text
* in the help output that mentions that features were
* backported for libvirt. The benefits of JSON mode now
* outweigh the downside.
*/
#if HAVE_YAJL
if (version >= 13000) {
qemuCapsSet(flags, QEMU_CAPS_MONITOR_JSON);
} else if (version >= 12000 &&
strstr(help, "libvirt")) {
qemuCapsSet(flags, QEMU_CAPS_MONITOR_JSON);
qemuCapsSet(flags, QEMU_CAPS_NETDEV);
}
#else
/* Starting with qemu 0.15 and newer, upstream qemu no longer
* promises to keep the human interface stable, but requests that
* we use QMP (the JSON interface) for everything. If the user
* forgot to include YAJL libraries when building their own
* libvirt but is targetting a newer qemu, we are better off
* telling them to recompile (the spec file includes the
* dependency, so distros won't hit this). */
if (version >= 15000 ||
(version >= 12000 && strstr(help, "libvirt"))) {
if (check_yajl) {
qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("this qemu binary requires libvirt to be "
"compiled with yajl"));
return -1;
}
qemuCapsSet(flags, QEMU_CAPS_NETDEV);
}
#endif
if (version >= 13000)
qemuCapsSet(flags, QEMU_CAPS_PCI_MULTIFUNCTION);
/* Although very new versions of qemu advertise the presence of
* the rombar option in the output of "qemu -device pci-assign,?",
* this advertisement was added to the code long after the option
* itself. According to qemu developers, though, rombar is
* available in all qemu binaries from release 0.12 onward.
* Setting the capability this way makes it available in more
* cases where it might be needed, and shouldn't cause any false
* positives (in the case that it did, qemu would produce an error
* log and refuse to start, so it would be immediately obvious).
*/
if (version >= 12000)
qemuCapsSet(flags, QEMU_CAPS_PCI_ROMBAR);
if (version >= 11000)
qemuCapsSet(flags, QEMU_CAPS_CPU_HOST);
return 0;
}
/* We parse the output of 'qemu -help' to get the QEMU
* version number. The first bit is easy, just parse
* 'QEMU PC emulator version x.y.z'
* or
* 'QEMU emulator version x.y.z'.
*
* With qemu-kvm, however, that is followed by a string
* in parenthesis as follows:
* - qemu-kvm-x.y.z in stable releases
* - kvm-XX for kvm versions up to kvm-85
* - qemu-kvm-devel-XX for kvm version kvm-86 and later
*
* For qemu-kvm versions before 0.10.z, we need to detect
* the KVM version number for some features. With 0.10.z
* and later, we just need the QEMU version number and
* whether it is KVM QEMU or mainline QEMU.
*/
#define QEMU_VERSION_STR_1 "QEMU emulator version"
#define QEMU_VERSION_STR_2 "QEMU PC emulator version"
#define QEMU_KVM_VER_PREFIX "(qemu-kvm-"
#define KVM_VER_PREFIX "(kvm-"
#define SKIP_BLANKS(p) do { while ((*(p) == ' ') || (*(p) == '\t')) (p)++; } while (0)
int qemuCapsParseHelpStr(const char *qemu,
const char *help,
virBitmapPtr flags,
unsigned int *version,
unsigned int *is_kvm,
unsigned int *kvm_version,
bool check_yajl)
{
unsigned major, minor, micro;
const char *p = help;
char *strflags;
*version = *is_kvm = *kvm_version = 0;
if (STRPREFIX(p, QEMU_VERSION_STR_1))
p += strlen(QEMU_VERSION_STR_1);
else if (STRPREFIX(p, QEMU_VERSION_STR_2))
p += strlen(QEMU_VERSION_STR_2);
else
goto fail;
SKIP_BLANKS(p);
major = virParseNumber(&p);
if (major == -1 || *p != '.')
goto fail;
++p;
minor = virParseNumber(&p);
if (minor == -1)
goto fail;
if (*p != '.') {
micro = 0;
} else {
++p;
micro = virParseNumber(&p);
if (micro == -1)
goto fail;
}
SKIP_BLANKS(p);
if (STRPREFIX(p, QEMU_KVM_VER_PREFIX)) {
*is_kvm = 1;
p += strlen(QEMU_KVM_VER_PREFIX);
} else if (STRPREFIX(p, KVM_VER_PREFIX)) {
int ret;
*is_kvm = 1;
p += strlen(KVM_VER_PREFIX);
ret = virParseNumber(&p);
if (ret == -1)
goto fail;
*kvm_version = ret;
}
*version = (major * 1000 * 1000) + (minor * 1000) + micro;
if (qemuCapsComputeCmdFlags(help, *version, *is_kvm, *kvm_version,
flags, check_yajl) < 0)
goto cleanup;
strflags = virBitmapString(flags);
VIR_DEBUG("Version %u.%u.%u, cooked version %u, flags %s",
major, minor, micro, *version, NULLSTR(strflags));
VIR_FREE(strflags);
if (*kvm_version)
VIR_DEBUG("KVM version %d detected", *kvm_version);
else if (*is_kvm)
VIR_DEBUG("qemu-kvm version %u.%u.%u detected", major, minor, micro);
return 0;
fail:
p = strchr(help, '\n');
if (!p)
p = strchr(help, '\0');
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot parse %s version number in '%.*s'"),
qemu, (int) (p - help), help);
cleanup:
return -1;
}
static int
qemuCapsExtractDeviceStr(const char *qemu,
virBitmapPtr flags)
{
char *output = NULL;
virCommandPtr cmd;
int ret = -1;
/* Cram together all device-related queries into one invocation;
* the output format makes it possible to distinguish what we
* need. With qemu 0.13.0 and later, unrecognized '-device
* bogus,?' cause an error in isolation, but are silently ignored
* in combination with '-device ?'. Upstream qemu 0.12.x doesn't
* understand '-device name,?', and always exits with status 1 for
* the simpler '-device ?', so this function is really only useful
* if -help includes "device driver,?". */
cmd = qemuCapsProbeCommand(qemu, flags);
virCommandAddArgList(cmd,
"-device", "?",
"-device", "pci-assign,?",
"-device", "virtio-blk-pci,?",
"-device", "virtio-net-pci,?",
"-device", "scsi-disk,?",
NULL);
/* qemu -help goes to stdout, but qemu -device ? goes to stderr. */
virCommandSetErrorBuffer(cmd, &output);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = qemuCapsParseDeviceStr(output, flags);
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
int
qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
{
/* Which devices exist. */
if (strstr(str, "name \"hda-duplex\""))
qemuCapsSet(flags, QEMU_CAPS_HDA_DUPLEX);
if (strstr(str, "name \"ccid-card-emulated\""))
qemuCapsSet(flags, QEMU_CAPS_CCID_EMULATED);
if (strstr(str, "name \"ccid-card-passthru\""))
qemuCapsSet(flags, QEMU_CAPS_CCID_PASSTHRU);
if (strstr(str, "name \"piix3-usb-uhci\""))
qemuCapsSet(flags, QEMU_CAPS_PIIX3_USB_UHCI);
if (strstr(str, "name \"piix4-usb-uhci\""))
qemuCapsSet(flags, QEMU_CAPS_PIIX4_USB_UHCI);
if (strstr(str, "name \"usb-ehci\""))
qemuCapsSet(flags, QEMU_CAPS_USB_EHCI);
if (strstr(str, "name \"ich9-usb-ehci1\""))
qemuCapsSet(flags, QEMU_CAPS_ICH9_USB_EHCI1);
if (strstr(str, "name \"vt82c686b-usb-uhci\""))
qemuCapsSet(flags, QEMU_CAPS_VT82C686B_USB_UHCI);
if (strstr(str, "name \"pci-ohci\""))
qemuCapsSet(flags, QEMU_CAPS_PCI_OHCI);
if (strstr(str, "name \"usb-redir\""))
qemuCapsSet(flags, QEMU_CAPS_USB_REDIR);
if (strstr(str, "name \"usb-hub\""))
qemuCapsSet(flags, QEMU_CAPS_USB_HUB);
if (strstr(str, "name \"ich9-ahci\""))
qemuCapsSet(flags, QEMU_CAPS_ICH9_AHCI);
/* Prefer -chardev spicevmc (detected earlier) over -device spicevmc */
if (!qemuCapsGet(flags, QEMU_CAPS_CHARDEV_SPICEVMC) &&
strstr(str, "name \"spicevmc\""))
qemuCapsSet(flags, QEMU_CAPS_DEVICE_SPICEVMC);
/* Features of given devices. */
if (strstr(str, "pci-assign.configfd"))
qemuCapsSet(flags, QEMU_CAPS_PCI_CONFIGFD);
if (strstr(str, "virtio-blk-pci.multifunction"))
qemuCapsSet(flags, QEMU_CAPS_PCI_MULTIFUNCTION);
if (strstr(str, "virtio-blk-pci.bootindex")) {
qemuCapsSet(flags, QEMU_CAPS_BOOTINDEX);
if (strstr(str, "pci-assign.bootindex"))
qemuCapsSet(flags, QEMU_CAPS_PCI_BOOTINDEX);
}
if (strstr(str, "virtio-net-pci.tx="))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_TX_ALG);
if (strstr(str, "name \"qxl-vga\""))
qemuCapsSet(flags, QEMU_CAPS_DEVICE_QXL_VGA);
if (strstr(str, "virtio-blk-pci.ioeventfd"))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_IOEVENTFD);
if (strstr(str, "name \"sga\""))
qemuCapsSet(flags, QEMU_CAPS_SGA);
if (strstr(str, "virtio-blk-pci.event_idx"))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_EVENT_IDX);
if (strstr(str, "virtio-net-pci.event_idx"))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_NET_EVENT_IDX);
if (strstr(str, "virtio-blk-pci.scsi"))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_SCSI);
if (strstr(str, "scsi-disk.channel"))
qemuCapsSet(flags, QEMU_CAPS_SCSI_DISK_CHANNEL);
if (strstr(str, "scsi-block"))
qemuCapsSet(flags, QEMU_CAPS_SCSI_BLOCK);
if (strstr(str, "scsi-cd"))
qemuCapsSet(flags, QEMU_CAPS_SCSI_CD);
if (strstr(str, "ide-cd"))
qemuCapsSet(flags, QEMU_CAPS_IDE_CD);
return 0;
}
int qemuCapsExtractVersionInfo(const char *qemu, const char *arch,
unsigned int *retversion,
virBitmapPtr *retflags)
{
int ret = -1;
unsigned int version, is_kvm, kvm_version;
virBitmapPtr flags = NULL;
char *help = NULL;
virCommandPtr cmd;
if (retflags)
*retflags = NULL;
if (retversion)
*retversion = 0;
/* Make sure the binary we are about to try exec'ing exists.
* Technically we could catch the exec() failure, but that's
* in a sub-process so it's hard to feed back a useful error.
*/
if (!virFileIsExecutable(qemu)) {
virReportSystemError(errno, _("Cannot find QEMU binary %s"), qemu);
return -1;
}
cmd = qemuCapsProbeCommand(qemu, NULL);
virCommandAddArgList(cmd, "-help", NULL);
virCommandSetOutputBuffer(cmd, &help);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (!(flags = qemuCapsNew()) ||
qemuCapsParseHelpStr(qemu, help, flags,
&version, &is_kvm, &kvm_version, true) == -1)
goto cleanup;
/* Currently only x86_64 and i686 support PCI-multibus. */
if (STREQLEN(arch, "x86_64", 6) ||
STREQLEN(arch, "i686", 4)) {
qemuCapsSet(flags, QEMU_CAPS_PCI_MULTIBUS);
}
/* qemuCapsExtractDeviceStr will only set additional flags if qemu
* understands the 0.13.0+ notion of "-device driver,". */
if (qemuCapsGet(flags, QEMU_CAPS_DEVICE) &&
strstr(help, "-device driver,?") &&
qemuCapsExtractDeviceStr(qemu, flags) < 0)
goto cleanup;
if (retversion)
*retversion = version;
if (retflags) {
*retflags = flags;
flags = NULL;
}
ret = 0;
cleanup:
VIR_FREE(help);
virCommandFree(cmd);
qemuCapsFree(flags);
return ret;
}
static void
uname_normalize (struct utsname *ut)
{
uname(ut);
/* Map i386, i486, i586 to i686. */
if (ut->machine[0] == 'i' &&
ut->machine[1] != '\0' &&
ut->machine[2] == '8' &&
ut->machine[3] == '6' &&
ut->machine[4] == '\0')
ut->machine[1] = '6';
}
int qemuCapsExtractVersion(virCapsPtr caps,
unsigned int *version)
{
const char *binary;
struct stat sb;
struct utsname ut;
if (*version > 0)
return 0;
uname_normalize(&ut);
if ((binary = virCapabilitiesDefaultGuestEmulator(caps,
"hvm",
ut.machine,
"qemu")) == NULL) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot find suitable emulator for %s"), ut.machine);
return -1;
}
if (stat(binary, &sb) < 0) {
virReportSystemError(errno,
_("Cannot find QEMU binary %s"), binary);
return -1;
}
if (qemuCapsExtractVersionInfo(binary, ut.machine, version, NULL) < 0) {
return -1;
}
return 0;
}
virBitmapPtr
qemuCapsNew(void)
{
virBitmapPtr caps;
if (!(caps = virBitmapAlloc(QEMU_CAPS_LAST)))
virReportOOMError();
return caps;
}
void
qemuCapsSet(virBitmapPtr caps,
enum qemuCapsFlags flag)
{
ignore_value(virBitmapSetBit(caps, flag));
}
void
qemuCapsSetList(virBitmapPtr caps, ...)
{
va_list list;
int flag;
va_start(list, caps);
while ((flag = va_arg(list, int)) < QEMU_CAPS_LAST)
ignore_value(virBitmapSetBit(caps, flag));
va_end(list);
}
void
qemuCapsClear(virBitmapPtr caps,
enum qemuCapsFlags flag)
{
ignore_value(virBitmapClearBit(caps, flag));
}
bool
qemuCapsGet(virBitmapPtr caps,
enum qemuCapsFlags flag)
{
bool b;
if (!caps || virBitmapGetBit(caps, flag, &b) < 0)
return false;
else
return b;
}
virCommandPtr
qemuCapsProbeCommand(const char *qemu,
virBitmapPtr qemuCaps)
{
virCommandPtr cmd = virCommandNew(qemu);
if (qemuCaps) {
if (qemuCapsGet(qemuCaps, QEMU_CAPS_NODEFCONFIG))
virCommandAddArg(cmd, "-nodefconfig");
}
virCommandAddEnvPassCommon(cmd);
virCommandClearCaps(cmd);
return cmd;
}
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