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/*
* cpu_generic.c: CPU manipulation driver for architectures which are not
* handled by their own driver
*
* Copyright (C) 2009-2011 Red Hat, Inc.
*
* 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:
* Jiri Denemark <jdenemar@redhat.com>
*/
#include <config.h>
#include "memory.h"
#include "virhash.h"
#include "cpu.h"
#include "cpu_generic.h"
#define VIR_FROM_THIS VIR_FROM_CPU
static virHashTablePtr
genericHashFeatures(virCPUDefPtr cpu)
{
virHashTablePtr hash;
unsigned int i;
if ((hash = virHashCreate(cpu->nfeatures, NULL)) == NULL)
return NULL;
for (i = 0; i < cpu->nfeatures; i++) {
if (virHashAddEntry(hash,
cpu->features[i].name,
cpu->features + i)) {
virHashFree(hash);
return NULL;
}
}
return hash;
}
static virCPUCompareResult
genericCompare(virCPUDefPtr host,
virCPUDefPtr cpu)
{
virHashTablePtr hash;
virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;
unsigned int i;
unsigned int reqfeatures;
if ((cpu->arch && STRNEQ(host->arch, cpu->arch)) ||
STRNEQ(host->model, cpu->model))
return VIR_CPU_COMPARE_INCOMPATIBLE;
if ((hash = genericHashFeatures(host)) == NULL) {
virReportOOMError();
goto cleanup;
}
reqfeatures = 0;
for (i = 0; i < cpu->nfeatures; i++) {
void *hval = virHashLookup(hash, cpu->features[i].name);
if (hval) {
if (cpu->type == VIR_CPU_TYPE_GUEST &&
cpu->features[i].policy == VIR_CPU_FEATURE_FORBID) {
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
goto cleanup;
}
reqfeatures++;
}
else {
if (cpu->type == VIR_CPU_TYPE_HOST ||
cpu->features[i].policy == VIR_CPU_FEATURE_REQUIRE) {
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
goto cleanup;
}
}
}
if (host->nfeatures > reqfeatures) {
if (cpu->type == VIR_CPU_TYPE_GUEST &&
cpu->match == VIR_CPU_MATCH_STRICT)
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
else
ret = VIR_CPU_COMPARE_SUPERSET;
}
else
ret = VIR_CPU_COMPARE_IDENTICAL;
cleanup:
virHashFree(hash);
return ret;
}
static virCPUDefPtr
genericBaseline(virCPUDefPtr *cpus,
unsigned int ncpus,
const char **models,
unsigned int nmodels)
{
virCPUDefPtr cpu = NULL;
virCPUFeatureDefPtr features = NULL;
unsigned int nfeatures;
unsigned int count;
unsigned int i, j;
if (models) {
bool found = false;
for (i = 0; i < nmodels; i++) {
if (STREQ(cpus[0]->model, models[i])) {
found = true;
break;
}
}
if (!found) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("CPU model '%s' is not support by hypervisor"),
cpus[0]->model);
goto error;
}
}
if (VIR_ALLOC(cpu) < 0 ||
!(cpu->arch = strdup(cpus[0]->arch)) ||
!(cpu->model = strdup(cpus[0]->model)) ||
VIR_ALLOC_N(features, cpus[0]->nfeatures) < 0)
goto no_memory;
cpu->type = VIR_CPU_TYPE_HOST;
count = nfeatures = cpus[0]->nfeatures;
for (i = 0; i < nfeatures; i++)
features[i].name = cpus[0]->features[i].name;
for (i = 1; i < ncpus; i++) {
virHashTablePtr hash;
if (STRNEQ(cpu->arch, cpus[i]->arch)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("CPUs have incompatible architectures: '%s' != '%s'"),
cpu->arch, cpus[i]->arch);
goto error;
}
if (STRNEQ(cpu->model, cpus[i]->model)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("CPU models don't match: '%s' != '%s'"),
cpu->model, cpus[i]->model);
goto error;
}
if (!(hash = genericHashFeatures(cpus[i])))
goto no_memory;
for (j = 0; j < nfeatures; j++) {
if (features[j].name &&
!virHashLookup(hash, features[j].name)) {
features[j].name = NULL;
count--;
}
}
virHashFree(hash);
}
if (VIR_ALLOC_N(cpu->features, count) < 0)
goto no_memory;
cpu->nfeatures = count;
j = 0;
for (i = 0; i < nfeatures; i++) {
if (!features[i].name)
continue;
if (!(cpu->features[j++].name = strdup(features[i].name)))
goto no_memory;
}
cleanup:
VIR_FREE(features);
return cpu;
no_memory:
virReportOOMError();
error:
virCPUDefFree(cpu);
cpu = NULL;
goto cleanup;
}
struct cpuArchDriver cpuDriverGeneric = {
.name = "generic",
.arch = NULL,
.narch = 0,
.compare = genericCompare,
.decode = NULL,
.encode = NULL,
.free = NULL,
.nodeData = NULL,
.guestData = NULL,
.baseline = genericBaseline,
.update = NULL,
};
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