libvirt/src/cpu/cpu_arm.c

/*
 * cpu_arm.c: CPU driver for arm CPUs
 *
 * Copyright (C) 2013 Red Hat, Inc.
 * Copyright (C) Canonical Ltd. 2012
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *      Chuck Short <chuck.short@canonical.com>
 */

#include <config.h>

#include "viralloc.h"
#include "cpu.h"
#include "virstring.h"

#define VIR_FROM_THIS VIR_FROM_CPU

static const virArch archs[] = {
    VIR_ARCH_ARMV6L,
    VIR_ARCH_ARMV7B,
    VIR_ARCH_ARMV7L,
    VIR_ARCH_AARCH64,
};


static int
virCPUarmUpdate(virCPUDefPtr guest,
                const virCPUDef *host)
{
    int ret = -1;
    virCPUDefPtr updated = NULL;

    if (guest->mode != VIR_CPU_MODE_HOST_MODEL)
        return 0;

    if (!host) {
        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                       _("unknown host CPU model"));
        goto cleanup;
    }

    if (!(updated = virCPUDefCopyWithoutModel(guest)))
        goto cleanup;

    updated->mode = VIR_CPU_MODE_CUSTOM;
    if (virCPUDefCopyModel(updated, host, true) < 0)
        goto cleanup;

    virCPUDefStealModel(guest, updated, false);
    guest->mode = VIR_CPU_MODE_CUSTOM;
    guest->match = VIR_CPU_MATCH_EXACT;
    ret = 0;

 cleanup:
    virCPUDefFree(updated);
    return ret;
}


static virCPUDefPtr
armBaseline(virCPUDefPtr *cpus,
            unsigned int ncpus ATTRIBUTE_UNUSED,
            const char **models ATTRIBUTE_UNUSED,
            unsigned int nmodels ATTRIBUTE_UNUSED,
            bool migratable ATTRIBUTE_UNUSED)
{
    virCPUDefPtr cpu = NULL;

    if (VIR_ALLOC(cpu) < 0 ||
        VIR_STRDUP(cpu->model, cpus[0]->model) < 0) {
        virCPUDefFree(cpu);
        return NULL;
    }

    cpu->type = VIR_CPU_TYPE_GUEST;
    cpu->match = VIR_CPU_MATCH_EXACT;

    return cpu;
}

static virCPUCompareResult
virCPUarmCompare(virCPUDefPtr host ATTRIBUTE_UNUSED,
                 virCPUDefPtr cpu ATTRIBUTE_UNUSED,
                 bool failMessages ATTRIBUTE_UNUSED)
{
    return VIR_CPU_COMPARE_IDENTICAL;
}

struct cpuArchDriver cpuDriverArm = {
    .name = "arm",
    .arch = archs,
    .narch = ARRAY_CARDINALITY(archs),
    .compare = virCPUarmCompare,
    .decode = NULL,
    .encode = NULL,
    .baseline = armBaseline,
    .update = virCPUarmUpdate,
};