qemu_capabilities.c 73.8 KB
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/*
 * qemu_capabilities.c: QEMU capabilities generation
 *
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 * Copyright (C) 2006-2013 Red Hat, Inc.
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 * 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
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 * License along with this library.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 *
 * Author: Daniel P. Berrange <berrange@redhat.com>
 */

#include <config.h>

#include "qemu_capabilities.h"
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#include "viralloc.h"
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#include "virlog.h"
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#include "virerror.h"
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#include "virutil.h"
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#include "virfile.h"
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#include "virpidfile.h"
#include "virprocess.h"
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#include "nodeinfo.h"
#include "cpu/cpu.h"
#include "domain_conf.h"
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#include "vircommand.h"
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#include "virbitmap.h"
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#include "virnodesuspend.h"
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#include "qemu_monitor.h"
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#include <fcntl.h>
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#include <sys/stat.h>
#include <unistd.h>
#include <sys/wait.h>
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#include <stdarg.h>
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#define VIR_FROM_THIS VIR_FROM_QEMU

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/* 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 */
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              "vhost-net",
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              "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",
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              "pci-multifunction", /* 60 */
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              "virtio-blk-pci.ioeventfd",
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              "sga",
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              "virtio-blk-pci.event_idx",
              "virtio-net-pci.event_idx",
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              "cache-directsync", /* 65 */
              "piix3-usb-uhci",
              "piix4-usb-uhci",
              "usb-ehci",
              "ich9-usb-ehci1",

              "vt82c686b-usb-uhci", /* 70 */
              "pci-ohci",
              "usb-redir",
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              "usb-hub",
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              "no-shutdown",
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              "cache-unsafe", /* 75 */
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              "rombar",
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              "ich9-ahci",
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              "no-acpi",
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              "fsdev-readonly",
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              "virtio-blk-pci.scsi", /* 80 */
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              "blk-sg-io",
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              "drive-copy-on-read",
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              "cpu-host",
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              "fsdev-writeout",
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              "drive-iotune", /* 85 */
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              "system_wakeup",
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              "scsi-disk.channel",
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              "scsi-block",
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              "transaction",
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              "block-job-sync", /* 90 */
              "block-job-async",
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              "scsi-cd",
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              "ide-cd",
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              "no-user-config",
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              "hda-micro", /* 95 */
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              "dump-guest-memory",
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              "nec-usb-xhci",
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              "virtio-s390",
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              "balloon-event",
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              "bridge", /* 100 */
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              "lsi",
              "virtio-scsi-pci",
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              "blockio",
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              "disable-s3",
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              "disable-s4", /* 105 */
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              "usb-redir.filter",
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              "ide-drive.wwn",
              "scsi-disk.wwn",
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              "seccomp-sandbox",
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              "reboot-timeout", /* 110 */
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              "dump-guest-core",
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              "seamless-migration",
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              "block-commit",
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              "vnc",
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              "drive-mirror", /* 115 */
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              "usb-redir.bootindex",
              "usb-host.bootindex",
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              "blockdev-snapshot-sync",
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              "qxl",

              "VGA", /* 120 */
              "cirrus-vga",
              "vmware-svga",
              "device-video-primary",
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              "s390-sclp",
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              "usb-serial", /* 125 */
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              "usb-net",
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              "add-fd",
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    );

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struct _qemuCaps {
    virObject object;

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    bool usedQMP;

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    char *binary;
    time_t mtime;

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    virBitmapPtr flags;
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    unsigned int version;
    unsigned int kvmVersion;

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    virArch arch;
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    size_t ncpuDefinitions;
    char **cpuDefinitions;

    size_t nmachineTypes;
    char **machineTypes;
    char **machineAliases;
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};

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struct _qemuCapsCache {
    virMutex lock;
    virHashTablePtr binaries;
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    char *libDir;
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    char *runDir;
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    uid_t runUid;
    gid_t runGid;
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};

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static virClassPtr qemuCapsClass;
static void qemuCapsDispose(void *obj);

static int qemuCapsOnceInit(void)
{
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    if (!(qemuCapsClass = virClassNew(virClassForObject(),
                                      "qemuCaps",
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                                      sizeof(qemuCaps),
                                      qemuCapsDispose)))
        return -1;

    return 0;
}

VIR_ONCE_GLOBAL_INIT(qemuCaps)

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static virArch qemuCapsArchFromString(const char *arch)
{
    if (STREQ(arch, "i386"))
        return VIR_ARCH_I686;
    if (STREQ(arch, "arm"))
        return VIR_ARCH_ARMV7L;

    return virArchFromString(arch);
}


static const char *qemuCapsArchToString(virArch arch)
{
    if (arch == VIR_ARCH_I686)
        return "i386";
    else if (arch == VIR_ARCH_ARMV7L)
        return "arm";

    return virArchToString(arch);
}


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struct _qemuCapsHookData {
    uid_t runUid;
    gid_t runGid;
};
typedef struct _qemuCapsHookData qemuCapsHookData;
typedef qemuCapsHookData *qemuCapsHookDataPtr;

static int qemuCapsHook(void * data)
{
    int ret;
    qemuCapsHookDataPtr hookData = data;

    if (!hookData) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("QEMU uid:gid not specified by caller"));
        ret = -1;
        goto cleanup;
    }

    VIR_DEBUG("Switch QEMU uid:gid to %d:%d",
              hookData->runUid, hookData->runGid);
    ret = virSetUIDGID(hookData->runUid, hookData->runGid);

cleanup:
    return ret;
}

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static virCommandPtr
qemuCapsProbeCommand(const char *qemu,
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                     qemuCapsPtr caps,
                     qemuCapsHookDataPtr hookData)
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{
    virCommandPtr cmd = virCommandNew(qemu);

    if (caps) {
        if (qemuCapsGet(caps, QEMU_CAPS_NO_USER_CONFIG))
            virCommandAddArg(cmd, "-no-user-config");
        else if (qemuCapsGet(caps, QEMU_CAPS_NODEFCONFIG))
            virCommandAddArg(cmd, "-nodefconfig");
    }

    virCommandAddEnvPassCommon(cmd);
    virCommandClearCaps(cmd);
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    virCommandSetPreExecHook(cmd, qemuCapsHook, hookData);
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    return cmd;
}


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static void
qemuSetDefaultMachine(qemuCapsPtr caps,
                      size_t defIdx)
{
    char *name = caps->machineTypes[defIdx];
    char *alias = caps->machineAliases[defIdx];

    memmove(caps->machineTypes + 1,
            caps->machineTypes,
            sizeof(caps->machineTypes[0]) * defIdx);
    memmove(caps->machineAliases + 1,
            caps->machineAliases,
            sizeof(caps->machineAliases[0]) * defIdx);
    caps->machineTypes[0] = name;
    caps->machineAliases[0] = alias;
}

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/* Format is:
 * <machine> <desc> [(default)|(alias of <canonical>)]
 */
static int
qemuCapsParseMachineTypesStr(const char *output,
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                             qemuCapsPtr caps)
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{
    const char *p = output;
    const char *next;
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    size_t defIdx = 0;
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    do {
        const char *t;
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        char *name;
        char *canonical = NULL;
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        if ((next = strchr(p, '\n')))
            ++next;

        if (STRPREFIX(p, "Supported machines are:"))
            continue;

        if (!(t = strchr(p, ' ')) || (next && t >= next))
            continue;

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        if (!(name = strndup(p, t - p)))
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            goto no_memory;

        p = t;
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        if ((t = strstr(p, "(default)")) && (!next || t < next))
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            defIdx = caps->nmachineTypes;
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        if ((t = strstr(p, "(alias of ")) && (!next || t < next)) {
            p = t + strlen("(alias of ");
            if (!(t = strchr(p, ')')) || (next && t >= next))
                continue;

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            if (!(canonical = strndup(p, t - p))) {
                VIR_FREE(name);
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                goto no_memory;
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            }
        }

        if (VIR_REALLOC_N(caps->machineTypes, caps->nmachineTypes + 1) < 0 ||
            VIR_REALLOC_N(caps->machineAliases, caps->nmachineTypes + 1) < 0) {
            VIR_FREE(name);
            VIR_FREE(canonical);
            goto no_memory;
        }
        caps->nmachineTypes++;
        if (canonical) {
            caps->machineTypes[caps->nmachineTypes-1] = canonical;
            caps->machineAliases[caps->nmachineTypes-1] = name;
        } else {
            caps->machineTypes[caps->nmachineTypes-1] = name;
            caps->machineAliases[caps->nmachineTypes-1] = NULL;
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        }
    } while ((p = next));

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    if (defIdx)
        qemuSetDefaultMachine(caps, defIdx);
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    return 0;

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no_memory:
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    virReportOOMError();
    return -1;
}

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static int
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qemuCapsProbeMachineTypes(qemuCapsPtr caps, qemuCapsHookDataPtr hookData)
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{
    char *output;
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    int ret = -1;
    virCommandPtr cmd;
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    int status;
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    /* 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.
     */
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    if (!virFileIsExecutable(caps->binary)) {
        virReportSystemError(errno, _("Cannot find QEMU binary %s"),
                             caps->binary);
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        return -1;
    }

436
    cmd = qemuCapsProbeCommand(caps->binary, caps, hookData);
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    virCommandAddArgList(cmd, "-M", "?", NULL);
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    virCommandSetOutputBuffer(cmd, &output);
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    /* Ignore failure from older qemu that did not understand '-M ?'.  */
    if (virCommandRun(cmd, &status) < 0)
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        goto cleanup;

444
    if (qemuCapsParseMachineTypesStr(output, caps) < 0)
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        goto cleanup;
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    ret = 0;

cleanup:
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    VIR_FREE(output);
    virCommandFree(cmd);
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    return ret;
}


typedef int
(*qemuCapsParseCPUModels)(const char *output,
459
                          qemuCapsPtr caps);
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/* Format:
 *      <arch> <model>
 * qemu-0.13 encloses some model names in []:
 *      <arch> [<model>]
 */
static int
qemuCapsParseX86Models(const char *output,
468
                       qemuCapsPtr caps)
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{
    const char *p = output;
    const char *next;
472
    int ret = -1;
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    do {
        const char *t;
476
        size_t len;
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        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;

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        if (VIR_EXPAND_N(caps->cpuDefinitions, caps->ncpuDefinitions, 1) < 0) {
            virReportOOMError();
            goto cleanup;
        }
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        if (next)
            len = next - p - 1;
        else
            len = strlen(p);
503

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        if (len > 2 && *p == '[' && p[len - 1] == ']') {
            p++;
            len -= 2;
        }
508

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        if (!(caps->cpuDefinitions[caps->ncpuDefinitions - 1] = strndup(p, len))) {
            virReportOOMError();
            goto cleanup;
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        }
    } while ((p = next));

515
    ret = 0;
516

517 518
cleanup:
    return ret;
519 520
}

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/* ppc64 parser.
 * Format : PowerPC <machine> <description>
 */
static int
qemuCapsParsePPCModels(const char *output,
526
                       qemuCapsPtr caps)
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{
    const char *p = output;
    const char *next;
530
    int ret = -1;
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    do {
        const char *t;
534
        size_t len;
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        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;

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        if (VIR_EXPAND_N(caps->cpuDefinitions, caps->ncpuDefinitions, 1) < 0) {
            virReportOOMError();
            goto cleanup;
        }
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560
        len = t - p - 1;
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        if (!(caps->cpuDefinitions[caps->ncpuDefinitions - 1] = strndup(p, len))) {
            virReportOOMError();
            goto cleanup;
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        }
    } while ((p = next));

568
    ret = 0;
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cleanup:
    return ret;
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}
573

574
static int
575
qemuCapsProbeCPUModels(qemuCapsPtr caps, qemuCapsHookDataPtr hookData)
576 577 578 579
{
    char *output = NULL;
    int ret = -1;
    qemuCapsParseCPUModels parse;
580
    virCommandPtr cmd;
581

582 583
    if (caps->arch == VIR_ARCH_I686 ||
        caps->arch == VIR_ARCH_X86_64)
584
        parse = qemuCapsParseX86Models;
585
    else if (caps->arch == VIR_ARCH_PPC64)
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        parse = qemuCapsParsePPCModels;
587
    else {
588
        VIR_DEBUG("don't know how to parse %s CPU models",
589
                  virArchToString(caps->arch));
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        return 0;
    }

593
    cmd = qemuCapsProbeCommand(caps->binary, caps, hookData);
594
    virCommandAddArgList(cmd, "-cpu", "?", NULL);
595
    virCommandSetOutputBuffer(cmd, &output);
596

597
    if (virCommandRun(cmd, NULL) < 0)
598 599
        goto cleanup;

600
    if (parse(output, caps) < 0)
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        goto cleanup;

    ret = 0;

cleanup:
    VIR_FREE(output);
607
    virCommandFree(cmd);
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    return ret;
}


613
static char *
614 615
qemuCapsFindBinaryForArch(virArch hostarch,
                          virArch guestarch)
616 617
{
    char *ret;
618 619
    const char *archstr = qemuCapsArchToString(guestarch);
    char *binary;
620

621 622 623 624 625 626 627 628 629 630 631 632 633 634
    if (virAsprintf(&binary, "qemu-system-%s", archstr) < 0) {
        virReportOOMError();
        return NULL;
    }

    ret = virFindFileInPath(binary);
    VIR_FREE(binary);
    if (ret && !virFileIsExecutable(ret))
        VIR_FREE(ret);

    if (guestarch == VIR_ARCH_I686 &&
        !ret &&
        hostarch == VIR_ARCH_X86_64) {
        ret = virFindFileInPath("qemu-system-x86_64");
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        if (ret && !virFileIsExecutable(ret))
            VIR_FREE(ret);
637
    }
638

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    if (guestarch == VIR_ARCH_I686 &&
        !ret) {
        ret = virFindFileInPath("qemu");
        if (ret && !virFileIsExecutable(ret))
            VIR_FREE(ret);
644
    }
645

646 647 648 649 650
    return ret;
}


static bool
651 652
qemuCapsIsValidForKVM(virArch hostarch,
                      virArch guestarch)
653
{
654
    if (hostarch == guestarch)
655
        return true;
656 657
    if (hostarch == VIR_ARCH_X86_64 &&
        guestarch == VIR_ARCH_I686)
658 659 660 661
        return true;
    return false;
}

662 663
static int
qemuCapsInitGuest(virCapsPtr caps,
664
                  qemuCapsCachePtr cache,
665 666
                  virArch hostarch,
                  virArch guestarch)
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{
    virCapsGuestPtr guest;
    int i;
    int haskvm = 0;
    int haskqemu = 0;
    char *kvmbin = NULL;
    char *binary = NULL;
    virCapsGuestMachinePtr *machines = NULL;
675
    size_t nmachines = 0;
676 677
    qemuCapsPtr qemubinCaps = NULL;
    qemuCapsPtr kvmbinCaps = NULL;
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    int ret = -1;

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    /* Check for existence of base emulator, or alternate base
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     * which can be used with magic cpu choice
     */
683
    binary = qemuCapsFindBinaryForArch(hostarch, guestarch);
684

685
    /* Ignore binary if extracting version info fails */
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    if (binary) {
        if (!(qemubinCaps = qemuCapsCacheLookup(cache, binary))) {
            virResetLastError();
            VIR_FREE(binary);
        }
    }
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    /* qemu-kvm/kvm binaries can only be used if
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     *  - host & guest arches match
     * Or
     *  - hostarch is x86_64 and guest arch is i686
     * The latter simply needs "-cpu qemu32"
     */
699
    if (qemuCapsIsValidForKVM(hostarch, guestarch)) {
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        const char *const kvmbins[] = { "/usr/libexec/qemu-kvm", /* RHEL */
                                        "qemu-kvm", /* Fedora */
                                        "kvm" }; /* Upstream .spec */
703

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        for (i = 0; i < ARRAY_CARDINALITY(kvmbins); ++i) {
            kvmbin = virFindFileInPath(kvmbins[i]);
706

707 708
            if (!kvmbin)
                continue;
709

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            if (!(kvmbinCaps = qemuCapsCacheLookup(cache, kvmbin))) {
                virResetLastError();
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                VIR_FREE(kvmbin);
                continue;
            }
715

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            if (!binary) {
                binary = kvmbin;
718
                qemubinCaps = kvmbinCaps;
719
                kvmbin = NULL;
720
                kvmbinCaps = NULL;
721
            }
722
            break;
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        }
    }

    if (!binary)
        return 0;

729
    if (access("/dev/kvm", F_OK) == 0 &&
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        (qemuCapsGet(qemubinCaps, QEMU_CAPS_KVM) ||
         qemuCapsGet(qemubinCaps, QEMU_CAPS_ENABLE_KVM) ||
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         kvmbin))
        haskvm = 1;

    if (access("/dev/kqemu", F_OK) == 0 &&
736
        qemuCapsGet(qemubinCaps, QEMU_CAPS_KQEMU))
737
        haskqemu = 1;
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    if (qemuCapsGetMachineTypesCaps(qemubinCaps, &nmachines, &machines) < 0)
        goto error;
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    /* We register kvm as the base emulator too, since we can
     * just give -no-kvm to disable acceleration if required */
    if ((guest = virCapabilitiesAddGuest(caps,
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Daniel P. Berrange 已提交
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                                         "hvm",
746
                                         guestarch,
747 748 749 750 751 752 753 754 755 756
                                         binary,
                                         NULL,
                                         nmachines,
                                         machines)) == NULL)
        goto error;

    machines = NULL;
    nmachines = 0;

    if (caps->host.cpu &&
J
Jiri Denemark 已提交
757
        caps->host.cpu->model &&
758
        qemuCapsGetCPUDefinitions(qemubinCaps, NULL) > 0 &&
759 760 761
        !virCapabilitiesAddGuestFeature(guest, "cpuselection", 1, 0))
        goto error;

762
    if (qemuCapsGet(qemubinCaps, QEMU_CAPS_BOOTINDEX) &&
J
Jiri Denemark 已提交
763
        !virCapabilitiesAddGuestFeature(guest, "deviceboot", 1, 0))
764 765
        goto error;

D
Daniel P. Berrange 已提交
766 767 768 769 770 771 772
    if (virCapabilitiesAddGuestDomain(guest,
                                      "qemu",
                                      NULL,
                                      NULL,
                                      0,
                                      NULL) == NULL)
        goto error;
773

D
Daniel P. Berrange 已提交
774 775 776 777 778 779 780 781
    if (haskqemu &&
        virCapabilitiesAddGuestDomain(guest,
                                      "kqemu",
                                      NULL,
                                      NULL,
                                      0,
                                      NULL) == NULL)
        goto error;
782

D
Daniel P. Berrange 已提交
783 784
    if (haskvm) {
        virCapsGuestDomainPtr dom;
785

D
Daniel P. Berrange 已提交
786 787 788
        if (kvmbin &&
            qemuCapsGetMachineTypesCaps(kvmbinCaps, &nmachines, &machines) < 0)
            goto error;
789

D
Daniel P. Berrange 已提交
790 791 792 793 794 795 796 797
        if ((dom = virCapabilitiesAddGuestDomain(guest,
                                                 "kvm",
                                                 kvmbin ? kvmbin : binary,
                                                 NULL,
                                                 nmachines,
                                                 machines)) == NULL) {
            goto error;
        }
798

D
Daniel P. Berrange 已提交
799 800
        machines = NULL;
        nmachines = 0;
801 802 803

    }

804 805
    if (((guestarch == VIR_ARCH_I686) ||
         (guestarch == VIR_ARCH_X86_64)) &&
806 807 808 809
        (virCapabilitiesAddGuestFeature(guest, "acpi", 1, 1) == NULL ||
         virCapabilitiesAddGuestFeature(guest, "apic", 1, 0) == NULL))
        goto error;

810
    if ((guestarch == VIR_ARCH_I686) &&
811 812 813
        (virCapabilitiesAddGuestFeature(guest, "pae", 1, 0) == NULL ||
         virCapabilitiesAddGuestFeature(guest, "nonpae", 1, 0) == NULL))
        goto error;
814 815 816 817

    ret = 0;

cleanup:
818 819
    VIR_FREE(binary);
    VIR_FREE(kvmbin);
820 821
    virObjectUnref(qemubinCaps);
    virObjectUnref(kvmbinCaps);
822 823 824 825 826 827 828 829 830 831 832 833

    return ret;

error:
    virCapabilitiesFreeMachines(machines, nmachines);

    goto cleanup;
}


static int
qemuCapsInitCPU(virCapsPtr caps,
834
                virArch arch)
835 836 837 838 839 840
{
    virCPUDefPtr cpu = NULL;
    union cpuData *data = NULL;
    virNodeInfo nodeinfo;
    int ret = -1;

841
    if (VIR_ALLOC(cpu) < 0) {
842 843 844 845
        virReportOOMError();
        goto error;
    }

846 847
    cpu->arch = arch;

848 849 850 851 852 853 854
    if (nodeGetInfo(NULL, &nodeinfo))
        goto error;

    cpu->type = VIR_CPU_TYPE_HOST;
    cpu->sockets = nodeinfo.sockets;
    cpu->cores = nodeinfo.cores;
    cpu->threads = nodeinfo.threads;
J
Jiri Denemark 已提交
855
    caps->host.cpu = cpu;
856

857
    if (!(data = cpuNodeData(arch))
858
        || cpuDecode(cpu, data, NULL, 0, NULL) < 0)
J
Jiri Denemark 已提交
859
        goto cleanup;
860 861 862 863

    ret = 0;

cleanup:
864
    cpuDataFree(arch, data);
865 866 867 868 869 870 871 872 873

    return ret;

error:
    virCPUDefFree(cpu);
    goto cleanup;
}


874
static int qemuDefaultConsoleType(const char *ostype ATTRIBUTE_UNUSED,
875
                                  virArch arch)
876
{
877 878
    if (arch == VIR_ARCH_S390 ||
        arch == VIR_ARCH_S390X)
879 880 881
        return VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_VIRTIO;
    else
        return VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL;
882 883 884
}


885
virCapsPtr qemuCapsInit(qemuCapsCachePtr cache)
886 887 888
{
    virCapsPtr caps;
    int i;
889 890

    if ((caps = virCapabilitiesNew(virArchFromHost(),
891
                                   1, 1)) == NULL)
892
        goto error;
893 894 895 896 897 898 899 900 901 902

    /* 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);
903
        VIR_WARN("Failed to query host NUMA topology, disabling NUMA capabilities");
904 905
    }

906
    if (qemuCapsInitCPU(caps, virArchFromHost()) < 0)
907
        VIR_WARN("Failed to get host CPU");
908

909 910
    /* Add the power management features of the host */

911
    if (virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
912 913
        VIR_WARN("Failed to get host power management capabilities");

914 915 916
    virCapabilitiesAddHostMigrateTransport(caps,
                                           "tcp");

917 918 919 920 921
    /* QEMU can support pretty much every arch that exists,
     * so just probe for them all - we gracefully fail
     * if a qemu-system-$ARCH binary can't be found
     */
    for (i = 0 ; i < VIR_ARCH_LAST ; i++)
922
        if (qemuCapsInitGuest(caps, cache,
923 924
                              virArchFromHost(),
                              i) < 0)
925
            goto error;
926 927 928 929

    /* QEMU Requires an emulator in the XML */
    virCapabilitiesSetEmulatorRequired(caps);

930
    caps->defaultConsoleTargetType = qemuDefaultConsoleType;
931 932 933

    return caps;

934
error:
935 936 937 938 939
    virCapabilitiesFree(caps);
    return NULL;
}


940
static int
941 942 943
qemuCapsComputeCmdFlags(const char *help,
                        unsigned int version,
                        unsigned int is_kvm,
944
                        unsigned int kvm_version,
945
                        qemuCapsPtr caps,
946
                        bool check_yajl ATTRIBUTE_UNUSED)
947 948
{
    const char *p;
R
Richa Marwaha 已提交
949
    const char *fsdev, *netdev;
950 951

    if (strstr(help, "-no-kqemu"))
952
        qemuCapsSet(caps, QEMU_CAPS_KQEMU);
953
    if (strstr(help, "-enable-kqemu"))
954
        qemuCapsSet(caps, QEMU_CAPS_ENABLE_KQEMU);
955
    if (strstr(help, "-no-kvm"))
956
        qemuCapsSet(caps, QEMU_CAPS_KVM);
957
    if (strstr(help, "-enable-kvm"))
958
        qemuCapsSet(caps, QEMU_CAPS_ENABLE_KVM);
959
    if (strstr(help, "-no-reboot"))
960
        qemuCapsSet(caps, QEMU_CAPS_NO_REBOOT);
961
    if (strstr(help, "-name")) {
962
        qemuCapsSet(caps, QEMU_CAPS_NAME);
963
        if (strstr(help, ",process="))
964
            qemuCapsSet(caps, QEMU_CAPS_NAME_PROCESS);
965 966
    }
    if (strstr(help, "-uuid"))
967
        qemuCapsSet(caps, QEMU_CAPS_UUID);
968
    if (strstr(help, "-xen-domid"))
969
        qemuCapsSet(caps, QEMU_CAPS_XEN_DOMID);
970
    else if (strstr(help, "-domid"))
971
        qemuCapsSet(caps, QEMU_CAPS_DOMID);
972
    if (strstr(help, "-drive")) {
973 974
        const char *cache = strstr(help, "cache=");

975
        qemuCapsSet(caps, QEMU_CAPS_DRIVE);
976 977
        if (cache && (p = strchr(cache, ']'))) {
            if (memmem(cache, p - cache, "on|off", sizeof("on|off") - 1) == NULL)
978
                qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_V2);
979
            if (memmem(cache, p - cache, "directsync", sizeof("directsync") - 1))
980
                qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_DIRECTSYNC);
981
            if (memmem(cache, p - cache, "unsafe", sizeof("unsafe") - 1))
982
                qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_UNSAFE);
983
        }
984
        if (strstr(help, "format="))
985
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_FORMAT);
986
        if (strstr(help, "readonly="))
987
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_READONLY);
988
        if (strstr(help, "aio=threads|native"))
989
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_AIO);
O
Osier Yang 已提交
990
        if (strstr(help, "copy-on-read=on|off"))
991
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_COPY_ON_READ);
992
        if (strstr(help, "bps="))
993
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_IOTUNE);
994 995 996 997
    }
    if ((p = strstr(help, "-vga")) && !strstr(help, "-std-vga")) {
        const char *nl = strstr(p, "\n");

998
        qemuCapsSet(caps, QEMU_CAPS_VGA);
999 1000

        if (strstr(p, "|qxl"))
1001
            qemuCapsSet(caps, QEMU_CAPS_VGA_QXL);
1002
        if ((p = strstr(p, "|none")) && p < nl)
1003
            qemuCapsSet(caps, QEMU_CAPS_VGA_NONE);
1004 1005
    }
    if (strstr(help, "-spice"))
1006
        qemuCapsSet(caps, QEMU_CAPS_SPICE);
1007 1008
    if (strstr(help, "-vnc"))
        qemuCapsSet(caps, QEMU_CAPS_VNC);
1009 1010
    if (strstr(help, "seamless-migration="))
        qemuCapsSet(caps, QEMU_CAPS_SEAMLESS_MIGRATION);
1011
    if (strstr(help, "boot=on"))
1012
        qemuCapsSet(caps, QEMU_CAPS_DRIVE_BOOT);
1013
    if (strstr(help, "serial=s"))
1014
        qemuCapsSet(caps, QEMU_CAPS_DRIVE_SERIAL);
1015
    if (strstr(help, "-pcidevice"))
1016
        qemuCapsSet(caps, QEMU_CAPS_PCIDEVICE);
1017
    if (strstr(help, "-mem-path"))
1018
        qemuCapsSet(caps, QEMU_CAPS_MEM_PATH);
1019
    if (strstr(help, "-chardev")) {
1020
        qemuCapsSet(caps, QEMU_CAPS_CHARDEV);
1021
        if (strstr(help, "-chardev spicevmc"))
1022
            qemuCapsSet(caps, QEMU_CAPS_CHARDEV_SPICEVMC);
1023
    }
1024
    if (strstr(help, "-balloon"))
1025
        qemuCapsSet(caps, QEMU_CAPS_BALLOON);
1026
    if (strstr(help, "-device")) {
1027
        qemuCapsSet(caps, QEMU_CAPS_DEVICE);
1028 1029 1030 1031
        /*
         * When -device was introduced, qemu already supported drive's
         * readonly option but didn't advertise that.
         */
1032
        qemuCapsSet(caps, QEMU_CAPS_DRIVE_READONLY);
1033 1034
    }
    if (strstr(help, "-nodefconfig"))
1035
        qemuCapsSet(caps, QEMU_CAPS_NODEFCONFIG);
1036
    if (strstr(help, "-no-user-config"))
1037
        qemuCapsSet(caps, QEMU_CAPS_NO_USER_CONFIG);
1038 1039
    /* The trailing ' ' is important to avoid a bogus match */
    if (strstr(help, "-rtc "))
1040
        qemuCapsSet(caps, QEMU_CAPS_RTC);
1041 1042
    /* to wit */
    if (strstr(help, "-rtc-td-hack"))
1043
        qemuCapsSet(caps, QEMU_CAPS_RTC_TD_HACK);
1044
    if (strstr(help, "-no-hpet"))
1045
        qemuCapsSet(caps, QEMU_CAPS_NO_HPET);
1046
    if (strstr(help, "-no-acpi"))
1047
        qemuCapsSet(caps, QEMU_CAPS_NO_ACPI);
1048
    if (strstr(help, "-no-kvm-pit-reinjection"))
1049
        qemuCapsSet(caps, QEMU_CAPS_NO_KVM_PIT);
1050
    if (strstr(help, "-tdf"))
1051
        qemuCapsSet(caps, QEMU_CAPS_TDF);
1052
    if (strstr(help, "-enable-nesting"))
1053
        qemuCapsSet(caps, QEMU_CAPS_NESTING);
1054
    if (strstr(help, ",menu=on"))
1055
        qemuCapsSet(caps, QEMU_CAPS_BOOT_MENU);
1056 1057
    if (strstr(help, ",reboot-timeout=rb_time"))
        qemuCapsSet(caps, QEMU_CAPS_REBOOT_TIMEOUT);
1058
    if ((fsdev = strstr(help, "-fsdev"))) {
1059
        qemuCapsSet(caps, QEMU_CAPS_FSDEV);
1060
        if (strstr(fsdev, "readonly"))
1061
            qemuCapsSet(caps, QEMU_CAPS_FSDEV_READONLY);
1062
        if (strstr(fsdev, "writeout"))
1063
            qemuCapsSet(caps, QEMU_CAPS_FSDEV_WRITEOUT);
1064
    }
1065
    if (strstr(help, "-smbios type"))
1066
        qemuCapsSet(caps, QEMU_CAPS_SMBIOS_TYPE);
1067 1068
    if (strstr(help, "-sandbox"))
        qemuCapsSet(caps, QEMU_CAPS_SECCOMP_SANDBOX);
1069

R
Richa Marwaha 已提交
1070
    if ((netdev = strstr(help, "-netdev"))) {
1071 1072
        /* Disable -netdev on 0.12 since although it exists,
         * the corresponding netdev_add/remove monitor commands
1073 1074
         * do not, and we need them to be able to do hotplug.
         * But see below about RHEL build. */
R
Richa Marwaha 已提交
1075 1076
        if (version >= 13000) {
            if (strstr(netdev, "bridge"))
1077 1078
                qemuCapsSet(caps, QEMU_CAPS_NETDEV_BRIDGE);
           qemuCapsSet(caps, QEMU_CAPS_NETDEV);
R
Richa Marwaha 已提交
1079
        }
1080 1081 1082
    }

    if (strstr(help, "-sdl"))
1083
        qemuCapsSet(caps, QEMU_CAPS_SDL);
1084 1085 1086
    if (strstr(help, "cores=") &&
        strstr(help, "threads=") &&
        strstr(help, "sockets="))
1087
        qemuCapsSet(caps, QEMU_CAPS_SMP_TOPOLOGY);
1088 1089

    if (version >= 9000)
1090
        qemuCapsSet(caps, QEMU_CAPS_VNC_COLON);
1091 1092

    if (is_kvm && (version >= 10000 || kvm_version >= 74))
1093
        qemuCapsSet(caps, QEMU_CAPS_VNET_HDR);
1094

1095
    if (strstr(help, ",vhost=")) {
1096
        qemuCapsSet(caps, QEMU_CAPS_VHOST_NET);
1097 1098
    }

1099 1100
    /* 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
1101
     * 0.14.* and 0.15.0)
1102
     */
1103
    if (strstr(help, "-no-shutdown") && (version < 14000 || version > 15000))
1104
        qemuCapsSet(caps, QEMU_CAPS_NO_SHUTDOWN);
1105

1106 1107 1108
    if (strstr(help, "dump-guest-core=on|off"))
        qemuCapsSet(caps, QEMU_CAPS_DUMP_GUEST_CORE);

1109 1110 1111 1112
    /*
     * Handling of -incoming arg with varying features
     *  -incoming tcp    (kvm >= 79, qemu >= 0.10.0)
     *  -incoming exec   (kvm >= 80, qemu >= 0.10.0)
1113 1114
     *  -incoming unix   (qemu >= 0.12.0)
     *  -incoming fd     (qemu >= 0.12.0)
1115 1116 1117 1118 1119 1120 1121
     *  -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) {
1122 1123
        qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_TCP);
        qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_EXEC);
1124
        if (version >= 12000) {
1125 1126
            qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_UNIX);
            qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_FD);
1127
        }
1128
    } else if (kvm_version >= 79) {
1129
        qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_TCP);
1130
        if (kvm_version >= 80)
1131
            qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_EXEC);
1132
    } else if (kvm_version > 0) {
1133
        qemuCapsSet(caps, QEMU_CAPS_MIGRATE_KVM_STDIO);
1134 1135 1136
    }

    if (version >= 10000)
1137
        qemuCapsSet(caps, QEMU_CAPS_0_10);
1138

1139
    if (version >= 11000)
1140
        qemuCapsSet(caps, QEMU_CAPS_VIRTIO_BLK_SG_IO);
1141

1142 1143 1144
    /* 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
1145 1146 1147 1148 1149
     * 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.
1150
     */
1151
#if WITH_YAJL
1152
    if (version >= 13000) {
1153
        qemuCapsSet(caps, QEMU_CAPS_MONITOR_JSON);
1154 1155
    } else if (version >= 12000 &&
               strstr(help, "libvirt")) {
1156 1157
        qemuCapsSet(caps, QEMU_CAPS_MONITOR_JSON);
        qemuCapsSet(caps, QEMU_CAPS_NETDEV);
1158
    }
1159 1160 1161 1162 1163 1164 1165
#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
1166
     * dependency, so distros won't hit this).  This check is
1167
     * also in m4/virt-yajl.m4 (see $with_yajl).  */
1168 1169 1170
    if (version >= 15000 ||
        (version >= 12000 && strstr(help, "libvirt"))) {
        if (check_yajl) {
1171 1172 1173
            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                           _("this qemu binary requires libvirt to be "
                             "compiled with yajl"));
1174 1175
            return -1;
        }
1176
        qemuCapsSet(caps, QEMU_CAPS_NETDEV);
1177
    }
E
Eric Blake 已提交
1178
#endif
1179 1180

    if (version >= 13000)
1181
        qemuCapsSet(caps, QEMU_CAPS_PCI_MULTIFUNCTION);
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193

    /* 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)
1194
        qemuCapsSet(caps, QEMU_CAPS_PCI_ROMBAR);
1195 1196

    if (version >= 11000)
1197
        qemuCapsSet(caps, QEMU_CAPS_CPU_HOST);
1198 1199 1200

    if (version >= 1002000)
        qemuCapsSet(caps, QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
1201
    return 0;
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
}

/* 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,
1230
                         qemuCapsPtr caps,
1231 1232
                         unsigned int *version,
                         unsigned int *is_kvm,
1233 1234
                         unsigned int *kvm_version,
                         bool check_yajl)
1235 1236 1237
{
    unsigned major, minor, micro;
    const char *p = help;
1238
    char *strflags;
1239

1240
    *version = *is_kvm = *kvm_version = 0;
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257

    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);
J
Jiri Denemark 已提交
1258
    if (minor == -1)
1259 1260
        goto fail;

J
Jiri Denemark 已提交
1261 1262 1263 1264 1265 1266 1267 1268
    if (*p != '.') {
        micro = 0;
    } else {
        ++p;
        micro = virParseNumber(&p);
        if (micro == -1)
            goto fail;
    }
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289

    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;

1290
    if (qemuCapsComputeCmdFlags(help, *version, *is_kvm, *kvm_version,
1291
                                caps, check_yajl) < 0)
1292
        goto cleanup;
1293

1294
    strflags = virBitmapString(caps->flags);
1295 1296 1297
    VIR_DEBUG("Version %u.%u.%u, cooked version %u, flags %s",
              major, minor, micro, *version, NULLSTR(strflags));
    VIR_FREE(strflags);
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307

    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');
1308 1309
    if (!p)
        p = strchr(help, '\0');
1310

1311 1312 1313
    virReportError(VIR_ERR_INTERNAL_ERROR,
                   _("cannot parse %s version number in '%.*s'"),
                   qemu, (int) (p - help), help);
1314

1315
cleanup:
1316 1317 1318
    return -1;
}

1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341

struct qemuCapsStringFlags {
    const char *value;
    int flag;
};


struct qemuCapsStringFlags qemuCapsObjectTypes[] = {
    { "hda-duplex", QEMU_CAPS_HDA_DUPLEX },
    { "hda-micro", QEMU_CAPS_HDA_MICRO },
    { "ccid-card-emulated", QEMU_CAPS_CCID_EMULATED },
    { "ccid-card-passthru", QEMU_CAPS_CCID_PASSTHRU },
    { "piix3-usb-uhci", QEMU_CAPS_PIIX3_USB_UHCI },
    { "piix4-usb-uhci", QEMU_CAPS_PIIX4_USB_UHCI },
    { "usb-ehci", QEMU_CAPS_USB_EHCI },
    { "ich9-usb-ehci1", QEMU_CAPS_ICH9_USB_EHCI1 },
    { "vt82c686b-usb-uhci", QEMU_CAPS_VT82C686B_USB_UHCI },
    { "pci-ohci", QEMU_CAPS_PCI_OHCI },
    { "nec-usb-xhci", QEMU_CAPS_NEC_USB_XHCI },
    { "usb-redir", QEMU_CAPS_USB_REDIR },
    { "usb-hub", QEMU_CAPS_USB_HUB },
    { "ich9-ahci", QEMU_CAPS_ICH9_AHCI },
    { "virtio-blk-s390", QEMU_CAPS_VIRTIO_S390 },
1342
    { "sclpconsole", QEMU_CAPS_SCLP_S390 },
1343 1344 1345 1346
    { "lsi53c895a", QEMU_CAPS_SCSI_LSI },
    { "virtio-scsi-pci", QEMU_CAPS_VIRTIO_SCSI_PCI },
    { "spicevmc", QEMU_CAPS_DEVICE_SPICEVMC },
    { "qxl-vga", QEMU_CAPS_DEVICE_QXL_VGA },
1347
    { "qxl", QEMU_CAPS_DEVICE_QXL },
1348 1349 1350 1351
    { "sga", QEMU_CAPS_SGA },
    { "scsi-block", QEMU_CAPS_SCSI_BLOCK },
    { "scsi-cd", QEMU_CAPS_SCSI_CD },
    { "ide-cd", QEMU_CAPS_IDE_CD },
1352 1353 1354
    { "VGA", QEMU_CAPS_DEVICE_VGA },
    { "cirrus-vga", QEMU_CAPS_DEVICE_CIRRUS_VGA },
    { "vmware-svga", QEMU_CAPS_DEVICE_VMWARE_SVGA },
G
Guannan Ren 已提交
1355
    { "usb-serial", QEMU_CAPS_DEVICE_USB_SERIAL},
G
Guannan Ren 已提交
1356
    { "usb-net", QEMU_CAPS_DEVICE_USB_NET},
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
};


static struct qemuCapsStringFlags qemuCapsObjectPropsVirtioBlk[] = {
    { "multifunction", QEMU_CAPS_PCI_MULTIFUNCTION },
    { "bootindex", QEMU_CAPS_BOOTINDEX },
    { "ioeventfd", QEMU_CAPS_VIRTIO_IOEVENTFD },
    { "event_idx", QEMU_CAPS_VIRTIO_BLK_EVENT_IDX },
    { "scsi", QEMU_CAPS_VIRTIO_BLK_SCSI },
    { "logical_block_size", QEMU_CAPS_BLOCKIO },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsVirtioNet[] = {
    { "tx", QEMU_CAPS_VIRTIO_TX_ALG },
    { "event_idx", QEMU_CAPS_VIRTIO_NET_EVENT_IDX },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsPciAssign[] = {
1375
    { "rombar", QEMU_CAPS_PCI_ROMBAR },
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
    { "configfd", QEMU_CAPS_PCI_CONFIGFD },
    { "bootindex", QEMU_CAPS_PCI_BOOTINDEX },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsScsiDisk[] = {
    { "channel", QEMU_CAPS_SCSI_DISK_CHANNEL },
    { "wwn", QEMU_CAPS_SCSI_DISK_WWN },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsIDEDrive[] = {
    { "wwn", QEMU_CAPS_IDE_DRIVE_WWN },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsPixx4PM[] = {
    { "disable_s3", QEMU_CAPS_DISABLE_S3 },
    { "disable_s4", QEMU_CAPS_DISABLE_S4 },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsUsbRedir[] = {
    { "filter", QEMU_CAPS_USB_REDIR_FILTER },
1396 1397 1398 1399 1400
    { "bootindex", QEMU_CAPS_USB_REDIR_BOOTINDEX },
};

static struct qemuCapsStringFlags qemuCapsObjectPropsUsbHost[] = {
    { "bootindex", QEMU_CAPS_USB_HOST_BOOTINDEX },
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
};

struct qemuCapsObjectTypeProps {
    const char *type;
    struct qemuCapsStringFlags *props;
    size_t nprops;
};

static struct qemuCapsObjectTypeProps qemuCapsObjectProps[] = {
    { "virtio-blk-pci", qemuCapsObjectPropsVirtioBlk,
      ARRAY_CARDINALITY(qemuCapsObjectPropsVirtioBlk) },
    { "virtio-net-pci", qemuCapsObjectPropsVirtioNet,
      ARRAY_CARDINALITY(qemuCapsObjectPropsVirtioNet) },
1414 1415 1416 1417
    { "virtio-blk-s390", qemuCapsObjectPropsVirtioBlk,
      ARRAY_CARDINALITY(qemuCapsObjectPropsVirtioBlk) },
    { "virtio-net-s390", qemuCapsObjectPropsVirtioNet,
      ARRAY_CARDINALITY(qemuCapsObjectPropsVirtioNet) },
1418 1419
    { "pci-assign", qemuCapsObjectPropsPciAssign,
      ARRAY_CARDINALITY(qemuCapsObjectPropsPciAssign) },
1420 1421
    { "kvm-pci-assign", qemuCapsObjectPropsPciAssign,
      ARRAY_CARDINALITY(qemuCapsObjectPropsPciAssign) },
1422 1423 1424 1425 1426 1427 1428 1429
    { "scsi-disk", qemuCapsObjectPropsScsiDisk,
      ARRAY_CARDINALITY(qemuCapsObjectPropsScsiDisk) },
    { "ide-drive", qemuCapsObjectPropsIDEDrive,
      ARRAY_CARDINALITY(qemuCapsObjectPropsIDEDrive) },
    { "PIIX4_PM", qemuCapsObjectPropsPixx4PM,
      ARRAY_CARDINALITY(qemuCapsObjectPropsPixx4PM) },
    { "usb-redir", qemuCapsObjectPropsUsbRedir,
      ARRAY_CARDINALITY(qemuCapsObjectPropsUsbRedir) },
1430 1431
    { "usb-host", qemuCapsObjectPropsUsbHost,
      ARRAY_CARDINALITY(qemuCapsObjectPropsUsbHost) },
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
};


static void
qemuCapsProcessStringFlags(qemuCapsPtr caps,
                           size_t nflags,
                           struct qemuCapsStringFlags *flags,
                           size_t nvalues,
                           char *const*values)
{
    size_t i, j;
    for (i = 0 ; i < nflags ; i++) {
        for (j = 0 ; j < nvalues ; j++) {
            if (STREQ(values[j], flags[i].value)) {
                qemuCapsSet(caps, flags[i].flag);
                break;
            }
        }
    }
}


static void
qemuCapsFreeStringList(size_t len,
                       char **values)
{
    size_t i;
    for (i = 0 ; i < len ; i++)
        VIR_FREE(values[i]);
    VIR_FREE(values);
}


#define OBJECT_TYPE_PREFIX "name \""

static int
qemuCapsParseDeviceStrObjectTypes(const char *str,
                                  char ***types)
{
    const char *tmp = str;
    int ret = -1;
    size_t ntypelist = 0;
    char **typelist = NULL;

    *types = NULL;

    while ((tmp = strstr(tmp, OBJECT_TYPE_PREFIX))) {
        char *end;
        tmp += strlen(OBJECT_TYPE_PREFIX);
        end = strstr(tmp, "\"");
        if (!end) {
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                           _("Malformed QEMU device list string, missing quote"));
            goto cleanup;
        }

        if (VIR_EXPAND_N(typelist, ntypelist, 1) < 0) {
            virReportOOMError();
            goto cleanup;
        }
        if (!(typelist[ntypelist-1] = strndup(tmp, end-tmp))) {
            virReportOOMError();
            goto cleanup;
        }
    }

    *types = typelist;
    ret = ntypelist;

cleanup:
    if (ret < 0)
        qemuCapsFreeStringList(ntypelist, typelist);
    return ret;
}


static int
qemuCapsParseDeviceStrObjectProps(const char *str,
                                  const char *type,
                                  char ***props)
{
    const char *tmp = str;
    int ret = -1;
    size_t nproplist = 0;
    char **proplist = NULL;

    VIR_DEBUG("Extract type %s", type);
    *props = NULL;

    while ((tmp = strchr(tmp, '\n'))) {
        char *end;
        tmp += 1;

        if (*tmp == '\0')
            break;

        if (STRPREFIX(tmp, OBJECT_TYPE_PREFIX))
            continue;

        if (!STRPREFIX(tmp, type))
            continue;

        tmp += strlen(type);
        if (*tmp != '.')
            continue;
        tmp++;

        end = strstr(tmp, "=");
        if (!end) {
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                           _("Malformed QEMU device list string, missing '='"));
            goto cleanup;
        }
        if (VIR_EXPAND_N(proplist, nproplist, 1) < 0) {
            virReportOOMError();
            goto cleanup;
        }
        if (!(proplist[nproplist-1] = strndup(tmp, end-tmp))) {
            virReportOOMError();
            goto cleanup;
        }
    }

    *props = proplist;
    ret = nproplist;

cleanup:
    if (ret < 0)
        qemuCapsFreeStringList(nproplist, proplist);
    return ret;
}


int
qemuCapsParseDeviceStr(qemuCapsPtr caps, const char *str)
{
    int nvalues;
    char **values;
    size_t i;

    if ((nvalues = qemuCapsParseDeviceStrObjectTypes(str, &values)) < 0)
        return -1;
    qemuCapsProcessStringFlags(caps,
                               ARRAY_CARDINALITY(qemuCapsObjectTypes),
                               qemuCapsObjectTypes,
                               nvalues, values);
    qemuCapsFreeStringList(nvalues, values);

    for (i = 0 ; i < ARRAY_CARDINALITY(qemuCapsObjectProps); i++) {
        const char *type = qemuCapsObjectProps[i].type;
        if ((nvalues = qemuCapsParseDeviceStrObjectProps(str,
                                                         type,
                                                         &values)) < 0)
            return -1;
        qemuCapsProcessStringFlags(caps,
                                   qemuCapsObjectProps[i].nprops,
                                   qemuCapsObjectProps[i].props,
                                   nvalues, values);
        qemuCapsFreeStringList(nvalues, values);
    }

    /* Prefer -chardev spicevmc (detected earlier) over -device spicevmc */
    if (qemuCapsGet(caps, QEMU_CAPS_CHARDEV_SPICEVMC))
        qemuCapsClear(caps, QEMU_CAPS_DEVICE_SPICEVMC);

    return 0;
}


E
Eric Blake 已提交
1601 1602
static int
qemuCapsExtractDeviceStr(const char *qemu,
1603 1604
                         qemuCapsPtr caps,
                         qemuCapsHookDataPtr hookData)
1605
{
E
Eric Blake 已提交
1606
    char *output = NULL;
1607
    virCommandPtr cmd;
E
Eric Blake 已提交
1608
    int ret = -1;
1609

E
Eric Blake 已提交
1610 1611
    /* Cram together all device-related queries into one invocation;
     * the output format makes it possible to distinguish what we
1612 1613
     * need.  With qemu 0.13.0 and later, unrecognized '-device
     * bogus,?' cause an error in isolation, but are silently ignored
1614
     * in combination with '-device ?'.  Upstream qemu 0.12.x doesn't
1615 1616
     * understand '-device name,?', and always exits with status 1 for
     * the simpler '-device ?', so this function is really only useful
1617
     * if -help includes "device driver,?".  */
1618
    cmd = qemuCapsProbeCommand(qemu, caps, hookData);
1619 1620 1621 1622 1623 1624
    virCommandAddArgList(cmd,
                         "-device", "?",
                         "-device", "pci-assign,?",
                         "-device", "virtio-blk-pci,?",
                         "-device", "virtio-net-pci,?",
                         "-device", "scsi-disk,?",
1625
                         "-device", "PIIX4_PM,?",
1626
                         "-device", "usb-redir,?",
1627
                         "-device", "ide-drive,?",
1628
                         "-device", "usb-host,?",
1629
                         NULL);
1630
    /* qemu -help goes to stdout, but qemu -device ? goes to stderr.  */
E
Eric Blake 已提交
1631
    virCommandSetErrorBuffer(cmd, &output);
1632

1633
    if (virCommandRun(cmd, NULL) < 0)
1634 1635
        goto cleanup;

1636
    ret = qemuCapsParseDeviceStr(caps, output);
1637 1638

cleanup:
E
Eric Blake 已提交
1639
    VIR_FREE(output);
1640
    virCommandFree(cmd);
E
Eric Blake 已提交
1641 1642 1643
    return ret;
}

1644

1645 1646 1647
int qemuCapsGetDefaultVersion(virCapsPtr caps,
                              qemuCapsCachePtr capsCache,
                              unsigned int *version)
1648 1649
{
    const char *binary;
1650
    qemuCapsPtr qemucaps;
1651 1652 1653 1654 1655 1656

    if (*version > 0)
        return 0;

    if ((binary = virCapabilitiesDefaultGuestEmulator(caps,
                                                      "hvm",
1657
                                                      virArchFromHost(),
1658
                                                      "qemu")) == NULL) {
1659
        virReportError(VIR_ERR_INTERNAL_ERROR,
1660 1661
                       _("Cannot find suitable emulator for %s"),
                       virArchToString(virArchFromHost()));
1662 1663 1664
        return -1;
    }

1665
    if (!(qemucaps = qemuCapsCacheLookup(capsCache, binary)))
1666 1667
        return -1;

1668 1669
    *version = qemuCapsGetVersion(qemucaps);
    virObjectUnref(qemucaps);
1670 1671
    return 0;
}
1672 1673


1674 1675 1676


qemuCapsPtr
1677 1678
qemuCapsNew(void)
{
1679
    qemuCapsPtr caps;
1680

1681 1682 1683 1684 1685 1686
    if (qemuCapsInitialize() < 0)
        return NULL;

    if (!(caps = virObjectNew(qemuCapsClass)))
        return NULL;

1687
    if (!(caps->flags = virBitmapNew(QEMU_CAPS_LAST)))
1688
        goto no_memory;
1689 1690

    return caps;
1691 1692 1693 1694 1695

no_memory:
    virReportOOMError();
    virObjectUnref(caps);
    return NULL;
1696 1697 1698
}


1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
qemuCapsPtr qemuCapsNewCopy(qemuCapsPtr caps)
{
    qemuCapsPtr ret = qemuCapsNew();
    size_t i;

    if (!ret)
        return NULL;

    virBitmapCopy(ret->flags, caps->flags);

1709
    ret->usedQMP = caps->usedQMP;
1710 1711
    ret->version = caps->version;
    ret->kvmVersion = caps->kvmVersion;
1712
    ret->arch = caps->arch;
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743

    if (VIR_ALLOC_N(ret->cpuDefinitions, caps->ncpuDefinitions) < 0)
        goto no_memory;
    ret->ncpuDefinitions = caps->ncpuDefinitions;
    for (i = 0 ; i < caps->ncpuDefinitions ; i++) {
        if (!(ret->cpuDefinitions[i] = strdup(caps->cpuDefinitions[i])))
            goto no_memory;
    }

    if (VIR_ALLOC_N(ret->machineTypes, caps->nmachineTypes) < 0)
        goto no_memory;
    if (VIR_ALLOC_N(ret->machineAliases, caps->nmachineTypes) < 0)
        goto no_memory;
    ret->nmachineTypes = caps->nmachineTypes;
    for (i = 0 ; i < caps->nmachineTypes ; i++) {
        if (!(ret->machineTypes[i] = strdup(caps->machineTypes[i])))
            goto no_memory;
        if (caps->machineAliases[i] &&
            !(ret->machineAliases[i] = strdup(caps->machineAliases[i])))
            goto no_memory;
    }

    return ret;

no_memory:
    virReportOOMError();
    virObjectUnref(ret);
    return NULL;
}


1744 1745 1746
void qemuCapsDispose(void *obj)
{
    qemuCapsPtr caps = obj;
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
    size_t i;

    for (i = 0 ; i < caps->nmachineTypes ; i++) {
        VIR_FREE(caps->machineTypes[i]);
        VIR_FREE(caps->machineAliases[i]);
    }
    VIR_FREE(caps->machineTypes);
    VIR_FREE(caps->machineAliases);

    for (i = 0 ; i < caps->ncpuDefinitions ; i++) {
        VIR_FREE(caps->cpuDefinitions[i]);
    }
    VIR_FREE(caps->cpuDefinitions);
1760 1761

    virBitmapFree(caps->flags);
1762 1763

    VIR_FREE(caps->binary);
1764 1765
}

1766
void
1767
qemuCapsSet(qemuCapsPtr caps,
1768 1769
            enum qemuCapsFlags flag)
{
1770
    ignore_value(virBitmapSetBit(caps->flags, flag));
1771 1772 1773 1774
}


void
1775
qemuCapsSetList(qemuCapsPtr caps, ...)
1776 1777 1778 1779 1780 1781
{
    va_list list;
    int flag;

    va_start(list, caps);
    while ((flag = va_arg(list, int)) < QEMU_CAPS_LAST)
1782
        ignore_value(virBitmapSetBit(caps->flags, flag));
1783
    va_end(list);
1784 1785 1786 1787
}


void
1788
qemuCapsClear(qemuCapsPtr caps,
1789 1790
              enum qemuCapsFlags flag)
{
1791 1792 1793 1794 1795 1796 1797
    ignore_value(virBitmapClearBit(caps->flags, flag));
}


char *qemuCapsFlagsString(qemuCapsPtr caps)
{
    return virBitmapString(caps->flags);
1798 1799 1800 1801
}


bool
1802
qemuCapsGet(qemuCapsPtr caps,
1803 1804
            enum qemuCapsFlags flag)
{
1805 1806
    bool b;

1807
    if (!caps || virBitmapGetBit(caps->flags, flag, &b) < 0)
1808 1809 1810
        return false;
    else
        return b;
1811
}
1812 1813


1814 1815 1816 1817 1818
const char *qemuCapsGetBinary(qemuCapsPtr caps)
{
    return caps->binary;
}

1819
virArch qemuCapsGetArch(qemuCapsPtr caps)
1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
{
    return caps->arch;
}


unsigned int qemuCapsGetVersion(qemuCapsPtr caps)
{
    return caps->version;
}


unsigned int qemuCapsGetKVMVersion(qemuCapsPtr caps)
{
    return caps->kvmVersion;
}


1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
int qemuCapsAddCPUDefinition(qemuCapsPtr caps,
                             const char *name)
{
    char *tmp = strdup(name);
    if (!tmp) {
        virReportOOMError();
        return -1;
    }
    if (VIR_EXPAND_N(caps->cpuDefinitions, caps->ncpuDefinitions, 1) < 0) {
        VIR_FREE(tmp);
        virReportOOMError();
        return -1;
    }
    caps->cpuDefinitions[caps->ncpuDefinitions-1] = tmp;
    return 0;
}


1855 1856 1857
size_t qemuCapsGetCPUDefinitions(qemuCapsPtr caps,
                                 char ***names)
{
1858 1859
    if (names)
        *names = caps->cpuDefinitions;
1860 1861 1862 1863 1864 1865 1866
    return caps->ncpuDefinitions;
}


size_t qemuCapsGetMachineTypes(qemuCapsPtr caps,
                               char ***names)
{
1867 1868
    if (names)
        *names = caps->machineTypes;
1869 1870 1871
    return caps->nmachineTypes;
}

1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
int qemuCapsGetMachineTypesCaps(qemuCapsPtr caps,
                                size_t *nmachines,
                                virCapsGuestMachinePtr **machines)
{
    size_t i;

    *nmachines = 0;
    *machines = NULL;
    if (VIR_ALLOC_N(*machines, caps->nmachineTypes) < 0)
        goto no_memory;
    *nmachines = caps->nmachineTypes;

    for (i = 0 ; i < caps->nmachineTypes ; i++) {
        virCapsGuestMachinePtr mach;
        if (VIR_ALLOC(mach) < 0)
            goto no_memory;
        if (caps->machineAliases[i]) {
            if (!(mach->name = strdup(caps->machineAliases[i])))
                goto no_memory;
            if (!(mach->canonical = strdup(caps->machineTypes[i])))
                goto no_memory;
        } else {
            if (!(mach->name = strdup(caps->machineTypes[i])))
                goto no_memory;
        }
        (*machines)[i] = mach;
    }

    return 0;

no_memory:
    virCapabilitiesFreeMachines(*machines, *nmachines);
    *nmachines = 0;
    *machines = NULL;
    return -1;
}



1911 1912 1913 1914 1915 1916

const char *qemuCapsGetCanonicalMachine(qemuCapsPtr caps,
                                        const char *name)
{
    size_t i;

1917 1918 1919
    if (!name)
        return NULL;

1920 1921 1922 1923 1924 1925 1926 1927 1928
    for (i = 0 ; i < caps->nmachineTypes ; i++) {
        if (!caps->machineAliases[i])
            continue;
        if (STREQ(caps->machineAliases[i], name))
            return caps->machineTypes[i];
    }

    return name;
}
1929 1930


1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
static int
qemuCapsProbeQMPCommands(qemuCapsPtr caps,
                         qemuMonitorPtr mon)
{
    char **commands = NULL;
    int ncommands;
    size_t i;

    if ((ncommands = qemuMonitorGetCommands(mon, &commands)) < 0)
        return -1;

    for (i = 0 ; i < ncommands ; i++) {
        char *name = commands[i];
        if (STREQ(name, "system_wakeup"))
            qemuCapsSet(caps, QEMU_CAPS_WAKEUP);
        else if (STREQ(name, "transaction"))
            qemuCapsSet(caps, QEMU_CAPS_TRANSACTION);
        else if (STREQ(name, "block_job_cancel"))
            qemuCapsSet(caps, QEMU_CAPS_BLOCKJOB_SYNC);
        else if (STREQ(name, "block-job-cancel"))
            qemuCapsSet(caps, QEMU_CAPS_BLOCKJOB_ASYNC);
        else if (STREQ(name, "dump-guest-memory"))
            qemuCapsSet(caps, QEMU_CAPS_DUMP_GUEST_MEMORY);
1954 1955 1956 1957
        else if (STREQ(name, "query-spice"))
            qemuCapsSet(caps, QEMU_CAPS_SPICE);
        else if (STREQ(name, "query-kvm"))
            qemuCapsSet(caps, QEMU_CAPS_KVM);
1958 1959
        else if (STREQ(name, "block-commit"))
            qemuCapsSet(caps, QEMU_CAPS_BLOCK_COMMIT);
1960 1961
        else if (STREQ(name, "query-vnc"))
            qemuCapsSet(caps, QEMU_CAPS_VNC);
1962 1963
        else if (STREQ(name, "drive-mirror"))
            qemuCapsSet(caps, QEMU_CAPS_DRIVE_MIRROR);
1964 1965
        else if (STREQ(name, "blockdev-snapshot-sync"))
            qemuCapsSet(caps, QEMU_CAPS_DISK_SNAPSHOT);
1966 1967
        else if (STREQ(name, "add-fd"))
            qemuCapsSet(caps, QEMU_CAPS_ADD_FD);
1968 1969 1970 1971
        VIR_FREE(name);
    }
    VIR_FREE(commands);

1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
    /* QMP add-fd was introduced in 1.2, but did not support
     * management control of set numbering, and did not have a
     * counterpart -add-fd command line option.  We require the
     * add-fd features from 1.3 or later.  */
    if (qemuCapsGet(caps, QEMU_CAPS_ADD_FD)) {
        int fd = open("/dev/null", O_RDONLY);
        if (fd < 0) {
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                           _("unable to probe for add-fd"));
            return -1;
        }
        if (qemuMonitorAddFd(mon, 0, fd, "/dev/null") < 0)
            qemuCapsClear(caps, QEMU_CAPS_ADD_FD);
        VIR_FORCE_CLOSE(fd);
    }

1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
    return 0;
}


static int
qemuCapsProbeQMPEvents(qemuCapsPtr caps,
                       qemuMonitorPtr mon)
{
    char **events = NULL;
    int nevents;
    size_t i;

    if ((nevents = qemuMonitorGetEvents(mon, &events)) < 0)
        return -1;

    for (i = 0 ; i < nevents ; i++) {
        char *name = events[i];

        if (STREQ(name, "BALLOON_CHANGE"))
            qemuCapsSet(caps, QEMU_CAPS_BALLOON_EVENT);
2008 2009
        if (STREQ(name, "SPICE_MIGRATE_COMPLETED"))
            qemuCapsSet(caps, QEMU_CAPS_SEAMLESS_MIGRATION);
2010 2011 2012 2013 2014 2015 2016 2017
        VIR_FREE(name);
    }
    VIR_FREE(events);

    return 0;
}


2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
static int
qemuCapsProbeQMPObjects(qemuCapsPtr caps,
                        qemuMonitorPtr mon)
{
    int nvalues;
    char **values;
    size_t i;

    if ((nvalues = qemuMonitorGetObjectTypes(mon, &values)) < 0)
        return -1;
    qemuCapsProcessStringFlags(caps,
                               ARRAY_CARDINALITY(qemuCapsObjectTypes),
                               qemuCapsObjectTypes,
                               nvalues, values);
    qemuCapsFreeStringList(nvalues, values);

    for (i = 0 ; i < ARRAY_CARDINALITY(qemuCapsObjectProps); i++) {
        const char *type = qemuCapsObjectProps[i].type;
        if ((nvalues = qemuMonitorGetObjectProps(mon,
                                                 type,
                                                 &values)) < 0)
            return -1;
        qemuCapsProcessStringFlags(caps,
                                   qemuCapsObjectProps[i].nprops,
                                   qemuCapsObjectProps[i].props,
                                   nvalues, values);
        qemuCapsFreeStringList(nvalues, values);
    }

    /* Prefer -chardev spicevmc (detected earlier) over -device spicevmc */
    if (qemuCapsGet(caps, QEMU_CAPS_CHARDEV_SPICEVMC))
        qemuCapsClear(caps, QEMU_CAPS_DEVICE_SPICEVMC);
2050 2051 2052
    /* If qemu supports newer -device qxl it supports -vga qxl as well */
    if (qemuCapsGet(caps, QEMU_CAPS_DEVICE_QXL))
        qemuCapsSet(caps, QEMU_CAPS_VGA_QXL);
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065

    return 0;
}


static int
qemuCapsProbeQMPMachineTypes(qemuCapsPtr caps,
                             qemuMonitorPtr mon)
{
    qemuMonitorMachineInfoPtr *machines = NULL;
    int nmachines = 0;
    int ret = -1;
    size_t i;
2066
    size_t defIdx = 0;
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081

    if ((nmachines = qemuMonitorGetMachines(mon, &machines)) < 0)
        goto cleanup;

    if (VIR_ALLOC_N(caps->machineTypes, nmachines) < 0) {
        virReportOOMError();
        goto cleanup;
    }
    if (VIR_ALLOC_N(caps->machineAliases, nmachines) < 0) {
        virReportOOMError();
        goto cleanup;
    }

    for (i = 0 ; i < nmachines ; i++) {
        if (machines[i]->alias) {
2082
            if (!(caps->machineAliases[i] = strdup(machines[i]->alias))) {
2083 2084 2085 2086
                virReportOOMError();
                goto cleanup;
            }
        }
2087 2088 2089 2090
        if (!(caps->machineTypes[i] = strdup(machines[i]->name))) {
            virReportOOMError();
            goto cleanup;
        }
2091 2092
        if (machines[i]->isDefault)
            defIdx = i;
2093
    }
2094 2095 2096 2097
    caps->nmachineTypes = nmachines;

    if (defIdx)
        qemuSetDefaultMachine(caps, defIdx);
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125

    ret = 0;

cleanup:
    for (i = 0 ; i < nmachines ; i++)
        qemuMonitorMachineInfoFree(machines[i]);
    VIR_FREE(machines);
    return ret;
}


static int
qemuCapsProbeQMPCPUDefinitions(qemuCapsPtr caps,
                               qemuMonitorPtr mon)
{
    int ncpuDefinitions;
    char **cpuDefinitions;

    if ((ncpuDefinitions = qemuMonitorGetCPUDefinitions(mon, &cpuDefinitions)) < 0)
        return -1;

    caps->ncpuDefinitions = ncpuDefinitions;
    caps->cpuDefinitions = cpuDefinitions;

    return 0;
}


2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
static int
qemuCapsProbeQMPKVMState(qemuCapsPtr caps,
                         qemuMonitorPtr mon)
{
    bool enabled = false;
    bool present = false;

    if (!qemuCapsGet(caps, QEMU_CAPS_KVM))
        return 0;

    if (qemuMonitorGetKVMState(mon, &enabled, &present) < 0)
        return -1;

    /* The QEMU_CAPS_KVM flag was initially set according to the QEMU
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
     * reporting the recognition of 'query-kvm' QMP command. That merely
     * indicates existance of the command though, not whether KVM support
     * is actually available, nor whether it is enabled by default.
     *
     * If it is not present we need to clear the flag, and if it is
     * not enabled by default we need to change the flag.
     */
    if (!present) {
        qemuCapsClear(caps, QEMU_CAPS_KVM);
    } else if (!enabled) {
2150 2151 2152 2153 2154 2155 2156 2157
        qemuCapsClear(caps, QEMU_CAPS_KVM);
        qemuCapsSet(caps, QEMU_CAPS_ENABLE_KVM);
    }

    return 0;
}


2158 2159 2160 2161 2162
int qemuCapsProbeQMP(qemuCapsPtr caps,
                     qemuMonitorPtr mon)
{
    VIR_DEBUG("caps=%p mon=%p", caps, mon);

2163 2164 2165
    if (caps->usedQMP)
        return 0;

2166 2167 2168 2169 2170 2171 2172 2173 2174 2175
    if (qemuCapsProbeQMPCommands(caps, mon) < 0)
        return -1;

    if (qemuCapsProbeQMPEvents(caps, mon) < 0)
        return -1;

    return 0;
}


2176 2177
#define QEMU_SYSTEM_PREFIX "qemu-system-"

2178
static int
2179
qemuCapsInitHelp(qemuCapsPtr caps, uid_t runUid, gid_t runGid)
2180
{
2181
    virCommandPtr cmd = NULL;
2182 2183
    unsigned int is_kvm;
    char *help = NULL;
2184 2185
    int ret = -1;
    const char *tmp;
2186
    qemuCapsHookData hookData;
2187

2188
    VIR_DEBUG("caps=%p", caps);
2189

2190
    tmp = strstr(caps->binary, QEMU_SYSTEM_PREFIX);
2191 2192
    if (tmp) {
        tmp += strlen(QEMU_SYSTEM_PREFIX);
2193

2194
        caps->arch = qemuCapsArchFromString(tmp);
2195
    } else {
2196
        caps->arch = virArchFromHost();
2197 2198
    }

2199 2200 2201
    hookData.runUid = runUid;
    hookData.runGid = runGid;
    cmd = qemuCapsProbeCommand(caps->binary, NULL, &hookData);
2202 2203 2204 2205
    virCommandAddArgList(cmd, "-help", NULL);
    virCommandSetOutputBuffer(cmd, &help);

    if (virCommandRun(cmd, NULL) < 0)
2206
        goto cleanup;
2207

2208 2209
    if (qemuCapsParseHelpStr(caps->binary,
                             help, caps,
2210 2211 2212 2213
                             &caps->version,
                             &is_kvm,
                             &caps->kvmVersion,
                             false) < 0)
2214
        goto cleanup;
2215 2216

    /* Currently only x86_64 and i686 support PCI-multibus. */
2217 2218
    if (caps->arch == VIR_ARCH_X86_64 ||
        caps->arch == VIR_ARCH_I686) {
2219
        qemuCapsSet(caps, QEMU_CAPS_PCI_MULTIBUS);
2220 2221 2222
    } else {
        /* -no-acpi is not supported on other archs
         * even if qemu reports it in -help */
2223
        qemuCapsClear(caps, QEMU_CAPS_NO_ACPI);
2224
    }
2225 2226 2227 2228 2229

    /* qemuCapsExtractDeviceStr will only set additional caps if qemu
     * understands the 0.13.0+ notion of "-device driver,".  */
    if (qemuCapsGet(caps, QEMU_CAPS_DEVICE) &&
        strstr(help, "-device driver,?") &&
2230
        qemuCapsExtractDeviceStr(caps->binary, caps, &hookData) < 0)
2231
        goto cleanup;
2232

2233
    if (qemuCapsProbeCPUModels(caps, &hookData) < 0)
2234
        goto cleanup;
2235

2236
    if (qemuCapsProbeMachineTypes(caps, &hookData) < 0)
2237
        goto cleanup;
2238

2239
    ret = 0;
2240
cleanup:
2241
    virCommandFree(cmd);
2242
    VIR_FREE(help);
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
    return ret;
}


static void qemuCapsMonitorNotify(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
                                  virDomainObjPtr vm ATTRIBUTE_UNUSED)
{
}

static qemuMonitorCallbacks callbacks = {
    .eofNotify = qemuCapsMonitorNotify,
    .errorNotify = qemuCapsMonitorNotify,
};


/* Capabilities that we assume are always enabled
 * for QEMU >= 1.2.0
 */
static void
qemuCapsInitQMPBasic(qemuCapsPtr caps)
{
    qemuCapsSet(caps, QEMU_CAPS_VNC_COLON);
    qemuCapsSet(caps, QEMU_CAPS_NO_REBOOT);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE);
    qemuCapsSet(caps, QEMU_CAPS_NAME);
    qemuCapsSet(caps, QEMU_CAPS_UUID);
    qemuCapsSet(caps, QEMU_CAPS_VNET_HDR);
    qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_TCP);
    qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_EXEC);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_V2);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_FORMAT);
    qemuCapsSet(caps, QEMU_CAPS_VGA);
    qemuCapsSet(caps, QEMU_CAPS_0_10);
    qemuCapsSet(caps, QEMU_CAPS_MEM_PATH);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_SERIAL);
    qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_UNIX);
    qemuCapsSet(caps, QEMU_CAPS_CHARDEV);
    qemuCapsSet(caps, QEMU_CAPS_MONITOR_JSON);
    qemuCapsSet(caps, QEMU_CAPS_BALLOON);
    qemuCapsSet(caps, QEMU_CAPS_DEVICE);
    qemuCapsSet(caps, QEMU_CAPS_SDL);
    qemuCapsSet(caps, QEMU_CAPS_SMP_TOPOLOGY);
    qemuCapsSet(caps, QEMU_CAPS_NETDEV);
    qemuCapsSet(caps, QEMU_CAPS_RTC);
    qemuCapsSet(caps, QEMU_CAPS_VHOST_NET);
    qemuCapsSet(caps, QEMU_CAPS_NO_HPET);
    qemuCapsSet(caps, QEMU_CAPS_NODEFCONFIG);
    qemuCapsSet(caps, QEMU_CAPS_BOOT_MENU);
    qemuCapsSet(caps, QEMU_CAPS_FSDEV);
    qemuCapsSet(caps, QEMU_CAPS_NAME_PROCESS);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_READONLY);
    qemuCapsSet(caps, QEMU_CAPS_SMBIOS_TYPE);
    qemuCapsSet(caps, QEMU_CAPS_VGA_NONE);
    qemuCapsSet(caps, QEMU_CAPS_MIGRATE_QEMU_FD);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_AIO);
    qemuCapsSet(caps, QEMU_CAPS_CHARDEV_SPICEVMC);
    qemuCapsSet(caps, QEMU_CAPS_DEVICE_QXL_VGA);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_DIRECTSYNC);
    qemuCapsSet(caps, QEMU_CAPS_NO_SHUTDOWN);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_CACHE_UNSAFE);
    qemuCapsSet(caps, QEMU_CAPS_FSDEV_READONLY);
    qemuCapsSet(caps, QEMU_CAPS_VIRTIO_BLK_SG_IO);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_COPY_ON_READ);
    qemuCapsSet(caps, QEMU_CAPS_CPU_HOST);
    qemuCapsSet(caps, QEMU_CAPS_FSDEV_WRITEOUT);
    qemuCapsSet(caps, QEMU_CAPS_DRIVE_IOTUNE);
    qemuCapsSet(caps, QEMU_CAPS_WAKEUP);
    qemuCapsSet(caps, QEMU_CAPS_NO_USER_CONFIG);
    qemuCapsSet(caps, QEMU_CAPS_NETDEV_BRIDGE);
2312
    qemuCapsSet(caps, QEMU_CAPS_SECCOMP_SANDBOX);
2313 2314 2315 2316 2317
}


static int
qemuCapsInitQMP(qemuCapsPtr caps,
2318
                const char *libDir,
2319 2320
                uid_t runUid,
                gid_t runGid)
2321 2322 2323 2324 2325
{
    int ret = -1;
    virCommandPtr cmd = NULL;
    qemuMonitorPtr mon = NULL;
    int major, minor, micro;
2326
    char *package = NULL;
2327 2328 2329 2330
    int status = 0;
    virDomainChrSourceDef config;
    char *monarg = NULL;
    char *monpath = NULL;
2331
    char *pidfile = NULL;
2332
    qemuCapsHookData hookData;
2333
    char *archstr;
2334 2335
    pid_t pid = 0;
    virDomainObj vm;
2336

2337 2338 2339
    /* the ".sock" sufix is important to avoid a possible clash with a qemu
     * domain called "capabilities"
     */
2340 2341 2342 2343 2344 2345 2346 2347 2348
    if (virAsprintf(&monpath, "%s/%s", libDir, "capabilities.monitor.sock") < 0) {
        virReportOOMError();
        goto cleanup;
    }
    if (virAsprintf(&monarg, "unix:%s,server,nowait", monpath) < 0) {
        virReportOOMError();
        goto cleanup;
    }

2349 2350
    /* ".pidfile" suffix is used rather than ".pid" to avoid a possible clash
     * with a qemu domain called "capabilities"
2351 2352 2353
     * Normally we'd use runDir for pid files, but because we're using
     * -daemonize we need QEMU to be allowed to create them, rather
     * than libvirtd. So we're using libDir which QEMU can write to
2354
     */
2355
    if (virAsprintf(&pidfile, "%s/%s", libDir, "capabilities.pidfile") < 0) {
2356 2357 2358 2359
        virReportOOMError();
        goto cleanup;
    }

2360 2361 2362 2363 2364 2365 2366
    memset(&config, 0, sizeof(config));
    config.type = VIR_DOMAIN_CHR_TYPE_UNIX;
    config.data.nix.path = monpath;
    config.data.nix.listen = false;

    VIR_DEBUG("Try to get caps via QMP caps=%p", caps);

2367 2368 2369 2370 2371 2372 2373
    /*
     * We explicitly need to use -daemonize here, rather than
     * virCommandDaemonize, because we need to synchronize
     * with QEMU creating its monitor socket API. Using
     * daemonize guarantees control won't return to libvirt
     * until the socket is present.
     */
2374 2375 2376 2377 2378 2379 2380
    cmd = virCommandNewArgList(caps->binary,
                               "-S",
                               "-no-user-config",
                               "-nodefaults",
                               "-nographic",
                               "-M", "none",
                               "-qmp", monarg,
2381 2382
                               "-pidfile", pidfile,
                               "-daemonize",
2383 2384 2385
                               NULL);
    virCommandAddEnvPassCommon(cmd);
    virCommandClearCaps(cmd);
2386 2387 2388
    hookData.runUid = runUid;
    hookData.runGid = runGid;
    virCommandSetPreExecHook(cmd, qemuCapsHook, &hookData);
2389 2390 2391 2392 2393 2394 2395 2396 2397 2398

    if (virCommandRun(cmd, &status) < 0)
        goto cleanup;

    if (status != 0) {
        ret = 0;
        VIR_DEBUG("QEMU %s exited with status %d", caps->binary, status);
        goto cleanup;
    }

2399 2400 2401 2402 2403 2404 2405 2406 2407 2408
    if (virPidFileReadPath(pidfile, &pid) < 0) {
        VIR_DEBUG("Failed to read pidfile %s", pidfile);
        ret = 0;
        goto cleanup;
    }

    memset(&vm, 0, sizeof(vm));
    vm.pid = pid;

    if (!(mon = qemuMonitorOpen(&vm, &config, true, &callbacks))) {
2409
        ret = 0;
2410
        goto cleanup;
2411
    }
2412

2413
    virObjectLock(mon);
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435

    if (qemuMonitorSetCapabilities(mon) < 0) {
        virErrorPtr err = virGetLastError();
        VIR_DEBUG("Failed to set monitor capabilities %s",
                  err ? err->message : "<unknown problem>");
        ret = 0;
        goto cleanup;
    }

    if (qemuMonitorGetVersion(mon,
                              &major, &minor, &micro,
                              &package) < 0) {
        virErrorPtr err = virGetLastError();
        VIR_DEBUG("Failed to query monitor version %s",
                  err ? err->message : "<unknown problem>");
        ret = 0;
        goto cleanup;
    }

    VIR_DEBUG("Got version %d.%d.%d (%s)",
              major, minor, micro, NULLSTR(package));

2436
    if (major < 1 || (major == 1 && minor < 2)) {
2437 2438 2439 2440 2441
        VIR_DEBUG("Not new enough for QMP capabilities detection");
        ret = 0;
        goto cleanup;
    }

2442
    caps->version = major * 1000000 + minor * 1000 + micro;
2443 2444 2445 2446
    caps->usedQMP = true;

    qemuCapsInitQMPBasic(caps);

2447
    if (!(archstr = qemuMonitorGetTargetArch(mon)))
2448 2449
        goto cleanup;

2450 2451 2452 2453 2454 2455 2456
    if ((caps->arch = qemuCapsArchFromString(archstr)) == VIR_ARCH_NONE) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Unknown QEMU arch %s"), archstr);
        VIR_FREE(archstr);
        goto cleanup;
    }
    VIR_FREE(archstr);
2457

2458
    /* Currently only x86_64 and i686 support PCI-multibus and -no-acpi. */
2459
    if (caps->arch == VIR_ARCH_X86_64 ||
2460
        caps->arch == VIR_ARCH_I686) {
2461
        qemuCapsSet(caps, QEMU_CAPS_PCI_MULTIBUS);
2462 2463
        qemuCapsSet(caps, QEMU_CAPS_NO_ACPI);
    }
2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474

    if (qemuCapsProbeQMPCommands(caps, mon) < 0)
        goto cleanup;
    if (qemuCapsProbeQMPEvents(caps, mon) < 0)
        goto cleanup;
    if (qemuCapsProbeQMPObjects(caps, mon) < 0)
        goto cleanup;
    if (qemuCapsProbeQMPMachineTypes(caps, mon) < 0)
        goto cleanup;
    if (qemuCapsProbeQMPCPUDefinitions(caps, mon) < 0)
        goto cleanup;
2475 2476
    if (qemuCapsProbeQMPKVMState(caps, mon) < 0)
        goto cleanup;
2477 2478 2479 2480 2481

    ret = 0;

cleanup:
    if (mon)
2482
        virObjectUnlock(mon);
2483 2484
    qemuMonitorClose(mon);
    virCommandAbort(cmd);
2485
    virCommandFree(cmd);
2486 2487
    VIR_FREE(monarg);
    VIR_FREE(monpath);
2488
    VIR_FREE(package);
2489

2490
    if (pid != 0) {
2491 2492
        char ebuf[1024];

2493 2494 2495 2496 2497 2498 2499
        VIR_DEBUG("Killing QMP caps process %lld", (long long) pid);
        if (virProcessKill(pid, SIGKILL) < 0 && errno != ESRCH)
            VIR_ERROR(_("Failed to kill process %lld: %s"),
                      (long long) pid,
                      virStrerror(errno, ebuf, sizeof(ebuf)));
    }
    if (pidfile) {
2500 2501 2502
        unlink(pidfile);
        VIR_FREE(pidfile);
    }
2503 2504 2505 2506 2507
    return ret;
}


qemuCapsPtr qemuCapsNewForBinary(const char *binary,
2508
                                 const char *libDir,
2509 2510
                                 uid_t runUid,
                                 gid_t runGid)
2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
{
    qemuCapsPtr caps = qemuCapsNew();
    struct stat sb;
    int rv;

    if (!(caps->binary = strdup(binary)))
        goto no_memory;

    /* We would also want to check faccessat if we cared about ACLs,
     * but we don't.  */
    if (stat(binary, &sb) < 0) {
        virReportSystemError(errno, _("Cannot check QEMU binary %s"),
                             binary);
        goto error;
    }
    caps->mtime = sb.st_mtime;

    /* 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, _("QEMU binary %s is not executable"),
                             binary);
        goto error;
    }

2538
    if ((rv = qemuCapsInitQMP(caps, libDir, runUid, runGid)) < 0)
2539 2540 2541
        goto error;

    if (!caps->usedQMP &&
2542
        qemuCapsInitHelp(caps, runUid, runGid) < 0)
2543 2544
        goto error;

2545 2546 2547 2548 2549 2550 2551
    return caps;

no_memory:
    virReportOOMError();
error:
    virObjectUnref(caps);
    caps = NULL;
2552
    return NULL;
2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
}


bool qemuCapsIsValid(qemuCapsPtr caps)
{
    struct stat sb;

    if (!caps->binary)
        return true;

    if (stat(caps->binary, &sb) < 0)
        return false;

    return sb.st_mtime == caps->mtime;
}
2568 2569 2570 2571 2572 2573 2574 2575 2576 2577


static void
qemuCapsHashDataFree(void *payload, const void *key ATTRIBUTE_UNUSED)
{
    virObjectUnref(payload);
}


qemuCapsCachePtr
2578 2579 2580
qemuCapsCacheNew(const char *libDir,
                 uid_t runUid,
                 gid_t runGid)
2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
{
    qemuCapsCachePtr cache;

    if (VIR_ALLOC(cache) < 0) {
        virReportOOMError();
        return NULL;
    }

    if (virMutexInit(&cache->lock) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Unable to initialize mutex"));
        VIR_FREE(cache);
        return NULL;
    }

    if (!(cache->binaries = virHashCreate(10, qemuCapsHashDataFree)))
        goto error;
2598
    if (!(cache->libDir = strdup(libDir))) {
2599 2600 2601
        virReportOOMError();
        goto error;
    }
2602

2603 2604 2605
    cache->runUid = runUid;
    cache->runGid = runGid;

2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629
    return cache;

error:
    qemuCapsCacheFree(cache);
    return NULL;
}


qemuCapsPtr
qemuCapsCacheLookup(qemuCapsCachePtr cache, const char *binary)
{
    qemuCapsPtr ret = NULL;
    virMutexLock(&cache->lock);
    ret = virHashLookup(cache->binaries, binary);
    if (ret &&
        !qemuCapsIsValid(ret)) {
        VIR_DEBUG("Cached capabilities %p no longer valid for %s",
                  ret, binary);
        virHashRemoveEntry(cache->binaries, binary);
        ret = NULL;
    }
    if (!ret) {
        VIR_DEBUG("Creating capabilities for %s",
                  binary);
2630
        ret = qemuCapsNewForBinary(binary, cache->libDir,
2631
                                   cache->runUid, cache->runGid);
2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668
        if (ret) {
            VIR_DEBUG("Caching capabilities %p for %s",
                      ret, binary);
            if (virHashAddEntry(cache->binaries, binary, ret) < 0) {
                virObjectUnref(ret);
                ret = NULL;
            }
        }
    }
    VIR_DEBUG("Returning caps %p for %s", ret, binary);
    virObjectRef(ret);
    virMutexUnlock(&cache->lock);
    return ret;
}


qemuCapsPtr
qemuCapsCacheLookupCopy(qemuCapsCachePtr cache, const char *binary)
{
    qemuCapsPtr caps = qemuCapsCacheLookup(cache, binary);
    qemuCapsPtr ret;

    if (!caps)
        return NULL;

    ret = qemuCapsNewCopy(caps);
    virObjectUnref(caps);
    return ret;
}


void
qemuCapsCacheFree(qemuCapsCachePtr cache)
{
    if (!cache)
        return;

2669
    VIR_FREE(cache->libDir);
2670 2671 2672 2673
    virHashFree(cache->binaries);
    virMutexDestroy(&cache->lock);
    VIR_FREE(cache);
}
2674 2675 2676 2677 2678 2679

bool
qemuCapsUsedQMP(qemuCapsPtr caps)
{
    return caps->usedQMP;
}