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libvirt/src/cpu/cpu_ppc64.c
Daniel P. Berrangé 600462834f Remove all Author(s): lines from source file headers 
In many files there are header comments that contain an Author:
statement, supposedly reflecting who originally wrote the code.
In a large collaborative project like libvirt, any non-trivial
file will have been modified by a large number of different
contributors. IOW, the Author: comments are quickly out of date,
omitting people who have made significant contribitions.

In some places Author: lines have been added despite the person
merely being responsible for creating the file by moving existing
code out of another file. IOW, the Author: lines give an incorrect
record of authorship.

With this all in mind, the comments are useless as a means to identify
who to talk to about code in a particular file. Contributors will always
be better off using 'git log' and 'git blame' if they need to  find the
author of a particular bit of code.

This commit thus deletes all Author: comments from the source and adds
a rule to prevent them reappearing.

The Copyright headers are similarly misleading and inaccurate, however,
we cannot delete these as they have legal meaning, despite being largely
inaccurate. In addition only the copyright holder is permitted to change
their respective copyright statement.

Reviewed-by: Erik Skultety <eskultet@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-13 16:08:38 +00:00

838 lines
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/*
* cpu_ppc64.c: CPU driver for 64-bit PowerPC CPUs
*
* Copyright (C) 2013 Red Hat, Inc.
* Copyright (C) IBM Corporation, 2010
*
* 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/>.
*/
#include <config.h>
#include "virlog.h"
#include "viralloc.h"
#include "cpu.h"
#include "virstring.h"
#include "cpu_map.h"
#include "virbuffer.h"
#define VIR_FROM_THIS VIR_FROM_CPU
VIR_LOG_INIT("cpu.cpu_ppc64");
static const virArch archs[] = { VIR_ARCH_PPC64, VIR_ARCH_PPC64LE };
struct ppc64_vendor {
char *name;
};
struct ppc64_model {
char *name;
const struct ppc64_vendor *vendor;
virCPUppc64Data data;
};
struct ppc64_map {
size_t nvendors;
struct ppc64_vendor **vendors;
size_t nmodels;
struct ppc64_model **models;
};
/* Convert a legacy CPU definition by transforming
* model names to generation names:
* POWER7_v2.1 => POWER7
* POWER7_v2.3 => POWER7
* POWER7+_v2.1 => POWER7
* POWER8_v1.0 => POWER8 */
static int
virCPUppc64ConvertLegacy(virCPUDefPtr cpu)
{
if (cpu->model &&
(STREQ(cpu->model, "POWER7_v2.1") ||
STREQ(cpu->model, "POWER7_v2.3") ||
STREQ(cpu->model, "POWER7+_v2.1") ||
STREQ(cpu->model, "POWER8_v1.0"))) {
cpu->model[strlen("POWERx")] = 0;
}
return 0;
}
/* Some hosts can run guests in compatibility mode, but not all
* host CPUs support this and not all combinations are valid.
* This function performs the necessary checks */
static virCPUCompareResult
ppc64CheckCompatibilityMode(const char *host_model,
const char *compat_mode)
{
int host;
int compat;
char *tmp;
virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;
if (!compat_mode)
return VIR_CPU_COMPARE_IDENTICAL;
/* Valid host CPUs: POWER6, POWER7, POWER8, POWER9 */
if (!STRPREFIX(host_model, "POWER") ||
!(tmp = (char *) host_model + strlen("POWER")) ||
virStrToLong_i(tmp, NULL, 10, &host) < 0 ||
host < 6 || host > 9) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s",
_("Host CPU does not support compatibility modes"));
goto out;
}
/* Valid compatibility modes: power6, power7, power8, power9 */
if (!STRPREFIX(compat_mode, "power") ||
!(tmp = (char *) compat_mode + strlen("power")) ||
virStrToLong_i(tmp, NULL, 10, &compat) < 0 ||
compat < 6 || compat > 9) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown compatibility mode %s"),
compat_mode);
goto out;
}
/* Version check */
if (compat > host)
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
else
ret = VIR_CPU_COMPARE_IDENTICAL;
out:
return ret;
}
static void
ppc64DataClear(virCPUppc64Data *data)
{
if (!data)
return;
VIR_FREE(data->pvr);
}
static int
ppc64DataCopy(virCPUppc64Data *dst, const virCPUppc64Data *src)
{
size_t i;
if (VIR_ALLOC_N(dst->pvr, src->len) < 0)
return -1;
dst->len = src->len;
for (i = 0; i < src->len; i++) {
dst->pvr[i].value = src->pvr[i].value;
dst->pvr[i].mask = src->pvr[i].mask;
}
return 0;
}
static void
ppc64VendorFree(struct ppc64_vendor *vendor)
{
if (!vendor)
return;
VIR_FREE(vendor->name);
VIR_FREE(vendor);
}
static struct ppc64_vendor *
ppc64VendorFind(const struct ppc64_map *map,
const char *name)
{
size_t i;
for (i = 0; i < map->nvendors; i++) {
if (STREQ(map->vendors[i]->name, name))
return map->vendors[i];
}
return NULL;
}
static void
ppc64ModelFree(struct ppc64_model *model)
{
if (!model)
return;
ppc64DataClear(&model->data);
VIR_FREE(model->name);
VIR_FREE(model);
}
static struct ppc64_model *
ppc64ModelCopy(const struct ppc64_model *model)
{
struct ppc64_model *copy;
if (VIR_ALLOC(copy) < 0)
goto error;
if (VIR_STRDUP(copy->name, model->name) < 0)
goto error;
if (ppc64DataCopy(&copy->data, &model->data) < 0)
goto error;
copy->vendor = model->vendor;
return copy;
error:
ppc64ModelFree(copy);
return NULL;
}
static struct ppc64_model *
ppc64ModelFind(const struct ppc64_map *map,
const char *name)
{
size_t i;
for (i = 0; i < map->nmodels; i++) {
if (STREQ(map->models[i]->name, name))
return map->models[i];
}
return NULL;
}
static struct ppc64_model *
ppc64ModelFindPVR(const struct ppc64_map *map,
uint32_t pvr)
{
size_t i;
size_t j;
for (i = 0; i < map->nmodels; i++) {
struct ppc64_model *model = map->models[i];
for (j = 0; j < model->data.len; j++) {
if ((pvr & model->data.pvr[j].mask) == model->data.pvr[j].value)
return model;
}
}
return NULL;
}
static struct ppc64_model *
ppc64ModelFromCPU(const virCPUDef *cpu,
const struct ppc64_map *map)
{
struct ppc64_model *model;
if (!cpu->model) {
virReportError(VIR_ERR_INVALID_ARG, "%s",
_("no CPU model specified"));
return NULL;
}
if (!(model = ppc64ModelFind(map, cpu->model))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown CPU model %s"), cpu->model);
return NULL;
}
return ppc64ModelCopy(model);
}
static void
ppc64MapFree(struct ppc64_map *map)
{
size_t i;
if (!map)
return;
for (i = 0; i < map->nmodels; i++)
ppc64ModelFree(map->models[i]);
VIR_FREE(map->models);
for (i = 0; i < map->nvendors; i++)
ppc64VendorFree(map->vendors[i]);
VIR_FREE(map->vendors);
VIR_FREE(map);
}
static int
ppc64VendorParse(xmlXPathContextPtr ctxt ATTRIBUTE_UNUSED,
const char *name,
void *data)
{
struct ppc64_map *map = data;
struct ppc64_vendor *vendor;
int ret = -1;
if (VIR_ALLOC(vendor) < 0)
return -1;
if (VIR_STRDUP(vendor->name, name) < 0)
goto cleanup;
if (ppc64VendorFind(map, vendor->name)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("CPU vendor %s already defined"), vendor->name);
goto cleanup;
}
if (VIR_APPEND_ELEMENT(map->vendors, map->nvendors, vendor) < 0)
goto cleanup;
ret = 0;
cleanup:
ppc64VendorFree(vendor);
return ret;
}
static int
ppc64ModelParse(xmlXPathContextPtr ctxt,
const char *name,
void *data)
{
struct ppc64_map *map = data;
struct ppc64_model *model;
xmlNodePtr *nodes = NULL;
char *vendor = NULL;
unsigned long pvr;
size_t i;
int n;
int ret = -1;
if (VIR_ALLOC(model) < 0)
goto cleanup;
if (VIR_STRDUP(model->name, name) < 0)
goto cleanup;
if (ppc64ModelFind(map, model->name)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("CPU model %s already defined"), model->name);
goto cleanup;
}
if (virXPathBoolean("boolean(./vendor)", ctxt)) {
vendor = virXPathString("string(./vendor/@name)", ctxt);
if (!vendor) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid vendor element in CPU model %s"),
model->name);
goto cleanup;
}
if (!(model->vendor = ppc64VendorFind(map, vendor))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown vendor %s referenced by CPU model %s"),
vendor, model->name);
goto cleanup;
}
}
if ((n = virXPathNodeSet("./pvr", ctxt, &nodes)) <= 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Missing PVR information for CPU model %s"),
model->name);
goto cleanup;
}
if (VIR_ALLOC_N(model->data.pvr, n) < 0)
goto cleanup;
model->data.len = n;
for (i = 0; i < n; i++) {
ctxt->node = nodes[i];
if (virXPathULongHex("string(./@value)", ctxt, &pvr) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Missing or invalid PVR value in CPU model %s"),
model->name);
goto cleanup;
}
model->data.pvr[i].value = pvr;
if (virXPathULongHex("string(./@mask)", ctxt, &pvr) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Missing or invalid PVR mask in CPU model %s"),
model->name);
goto cleanup;
}
model->data.pvr[i].mask = pvr;
}
if (VIR_APPEND_ELEMENT(map->models, map->nmodels, model) < 0)
goto cleanup;
ret = 0;
cleanup:
ppc64ModelFree(model);
VIR_FREE(vendor);
VIR_FREE(nodes);
return ret;
}
static struct ppc64_map *
ppc64LoadMap(void)
{
struct ppc64_map *map;
if (VIR_ALLOC(map) < 0)
goto error;
if (cpuMapLoad("ppc64", ppc64VendorParse, NULL, ppc64ModelParse, map) < 0)
goto error;
return map;
error:
ppc64MapFree(map);
return NULL;
}
static virCPUDataPtr
ppc64MakeCPUData(virArch arch,
virCPUppc64Data *data)
{
virCPUDataPtr cpuData;
if (VIR_ALLOC(cpuData) < 0)
return NULL;
cpuData->arch = arch;
if (ppc64DataCopy(&cpuData->data.ppc64, data) < 0)
VIR_FREE(cpuData);
return cpuData;
}
static virCPUCompareResult
ppc64Compute(virCPUDefPtr host,
const virCPUDef *other,
virCPUDataPtr *guestData,
char **message)
{
struct ppc64_map *map = NULL;
struct ppc64_model *host_model = NULL;
struct ppc64_model *guest_model = NULL;
virCPUDefPtr cpu = NULL;
virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;
virArch arch;
size_t i;
/* Ensure existing configurations are handled correctly */
if (!(cpu = virCPUDefCopy(other)) ||
virCPUppc64ConvertLegacy(cpu) < 0)
goto cleanup;
if (cpu->arch != VIR_ARCH_NONE) {
bool found = false;
for (i = 0; i < ARRAY_CARDINALITY(archs); i++) {
if (archs[i] == cpu->arch) {
found = true;
break;
}
}
if (!found) {
VIR_DEBUG("CPU arch %s does not match host arch",
virArchToString(cpu->arch));
if (message &&
virAsprintf(message,
_("CPU arch %s does not match host arch"),
virArchToString(cpu->arch)) < 0)
goto cleanup;
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
goto cleanup;
}
arch = cpu->arch;
} else {
arch = host->arch;
}
if (cpu->vendor &&
(!host->vendor || STRNEQ(cpu->vendor, host->vendor))) {
VIR_DEBUG("host CPU vendor does not match required CPU vendor %s",
cpu->vendor);
if (message &&
virAsprintf(message,
_("host CPU vendor does not match required "
"CPU vendor %s"),
cpu->vendor) < 0)
goto cleanup;
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
goto cleanup;
}
if (!(map = ppc64LoadMap()))
goto cleanup;
/* Host CPU information */
if (!(host_model = ppc64ModelFromCPU(host, map)))
goto cleanup;
if (cpu->type == VIR_CPU_TYPE_GUEST) {
/* Guest CPU information */
virCPUCompareResult tmp;
switch (cpu->mode) {
case VIR_CPU_MODE_HOST_MODEL:
/* host-model only:
* we need to take compatibility modes into account */
tmp = ppc64CheckCompatibilityMode(host->model, cpu->model);
if (tmp != VIR_CPU_COMPARE_IDENTICAL) {
ret = tmp;
goto cleanup;
}
ATTRIBUTE_FALLTHROUGH;
case VIR_CPU_MODE_HOST_PASSTHROUGH:
/* host-model and host-passthrough:
* the guest CPU is the same as the host */
guest_model = ppc64ModelCopy(host_model);
break;
case VIR_CPU_MODE_CUSTOM:
/* custom:
* look up guest CPU information */
guest_model = ppc64ModelFromCPU(cpu, map);
break;
}
} else {
/* Other host CPU information */
guest_model = ppc64ModelFromCPU(cpu, map);
}
if (!guest_model)
goto cleanup;
if (STRNEQ(guest_model->name, host_model->name)) {
VIR_DEBUG("host CPU model does not match required CPU model %s",
guest_model->name);
if (message &&
virAsprintf(message,
_("host CPU model does not match required "
"CPU model %s"),
guest_model->name) < 0)
goto cleanup;
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
goto cleanup;
}
if (guestData)
if (!(*guestData = ppc64MakeCPUData(arch, &guest_model->data)))
goto cleanup;
ret = VIR_CPU_COMPARE_IDENTICAL;
cleanup:
virCPUDefFree(cpu);
ppc64MapFree(map);
ppc64ModelFree(host_model);
ppc64ModelFree(guest_model);
return ret;
}
static virCPUCompareResult
virCPUppc64Compare(virCPUDefPtr host,
virCPUDefPtr cpu,
bool failIncompatible)
{
virCPUCompareResult ret;
char *message = NULL;
if (!host || !host->model) {
if (failIncompatible) {
virReportError(VIR_ERR_CPU_INCOMPATIBLE, "%s",
_("unknown host CPU"));
} else {
VIR_WARN("unknown host CPU");
ret = VIR_CPU_COMPARE_INCOMPATIBLE;
}
return -1;
}
ret = ppc64Compute(host, cpu, NULL, &message);
if (failIncompatible && ret == VIR_CPU_COMPARE_INCOMPATIBLE) {
ret = VIR_CPU_COMPARE_ERROR;
if (message) {
virReportError(VIR_ERR_CPU_INCOMPATIBLE, "%s", message);
} else {
virReportError(VIR_ERR_CPU_INCOMPATIBLE, NULL);
}
}
VIR_FREE(message);
return ret;
}
static int
ppc64DriverDecode(virCPUDefPtr cpu,
const virCPUData *data,
virDomainCapsCPUModelsPtr models)
{
int ret = -1;
struct ppc64_map *map;
const struct ppc64_model *model;
if (!data || !(map = ppc64LoadMap()))
return -1;
if (!(model = ppc64ModelFindPVR(map, data->data.ppc64.pvr[0].value))) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("Cannot find CPU model with PVR 0x%08x"),
data->data.ppc64.pvr[0].value);
goto cleanup;
}
if (!virCPUModelIsAllowed(model->name, models)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("CPU model %s is not supported by hypervisor"),
model->name);
goto cleanup;
}
if (VIR_STRDUP(cpu->model, model->name) < 0 ||
(model->vendor && VIR_STRDUP(cpu->vendor, model->vendor->name) < 0)) {
goto cleanup;
}
ret = 0;
cleanup:
ppc64MapFree(map);
return ret;
}
static void
virCPUppc64DataFree(virCPUDataPtr data)
{
if (!data)
return;
ppc64DataClear(&data->data.ppc64);
VIR_FREE(data);
}
static int
virCPUppc64GetHost(virCPUDefPtr cpu,
virDomainCapsCPUModelsPtr models)
{
virCPUDataPtr cpuData = NULL;
virCPUppc64Data *data;
int ret = -1;
if (!(cpuData = virCPUDataNew(archs[0])))
goto cleanup;
data = &cpuData->data.ppc64;
if (VIR_ALLOC_N(data->pvr, 1) < 0)
goto cleanup;
data->len = 1;
#if defined(__powerpc__) || defined(__powerpc64__)
asm("mfpvr %0"
: "=r" (data->pvr[0].value));
#endif
data->pvr[0].mask = 0xfffffffful;
ret = ppc64DriverDecode(cpu, cpuData, models);
cleanup:
virCPUppc64DataFree(cpuData);
return ret;
}
static int
virCPUppc64Update(virCPUDefPtr guest,
const virCPUDef *host ATTRIBUTE_UNUSED)
{
/*
* - host-passthrough doesn't even get here
* - host-model is used for host CPU running in a compatibility mode and
* it needs to remain unchanged
* - custom doesn't support any optional features, there's nothing to
* update
*/
if (guest->mode == VIR_CPU_MODE_CUSTOM)
guest->match = VIR_CPU_MATCH_EXACT;
return 0;
}
static virCPUDefPtr
virCPUppc64Baseline(virCPUDefPtr *cpus,
unsigned int ncpus,
virDomainCapsCPUModelsPtr models ATTRIBUTE_UNUSED,
const char **features ATTRIBUTE_UNUSED,
bool migratable ATTRIBUTE_UNUSED)
{
struct ppc64_map *map;
const struct ppc64_model *model;
const struct ppc64_vendor *vendor = NULL;
virCPUDefPtr cpu = NULL;
size_t i;
if (!(map = ppc64LoadMap()))
goto error;
if (!(model = ppc64ModelFind(map, cpus[0]->model))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown CPU model %s"), cpus[0]->model);
goto error;
}
for (i = 0; i < ncpus; i++) {
const struct ppc64_vendor *vnd;
/* Hosts running old (<= 1.2.18) versions of libvirt will report
* strings like 'power7+' or 'power8e' instead of proper CPU model
* names in the capabilities XML; moreover, they lack information
* about some proper CPU models like 'POWER8'.
* This implies two things:
* 1) baseline among such hosts never worked
* 2) while a few models, eg. 'POWER8_v1.0', could work on both
* old and new versions of libvirt, the information we have
* here is not enough to pick such a model
* Hence we just compare models by name to decide whether or not
* two hosts are compatible */
if (STRNEQ(cpus[i]->model, model->name)) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("CPUs are incompatible"));
goto error;
}
if (!cpus[i]->vendor)
continue;
if (!(vnd = ppc64VendorFind(map, cpus[i]->vendor))) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("Unknown CPU vendor %s"), cpus[i]->vendor);
goto error;
}
if (model->vendor) {
if (model->vendor != vnd) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("CPU vendor %s of model %s differs from "
"vendor %s"),
model->vendor->name, model->name,
vnd->name);
goto error;
}
} else if (vendor) {
if (vendor != vnd) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("CPU vendors do not match"));
goto error;
}
} else {
vendor = vnd;
}
}
if (VIR_ALLOC(cpu) < 0 ||
VIR_STRDUP(cpu->model, model->name) < 0)
goto error;
if (vendor && VIR_STRDUP(cpu->vendor, vendor->name) < 0)
goto error;
cpu->type = VIR_CPU_TYPE_GUEST;
cpu->match = VIR_CPU_MATCH_EXACT;
cpu->fallback = VIR_CPU_FALLBACK_FORBID;
cleanup:
ppc64MapFree(map);
return cpu;
error:
virCPUDefFree(cpu);
cpu = NULL;
goto cleanup;
}
static int
virCPUppc64DriverGetModels(char ***models)
{
struct ppc64_map *map;
size_t i;
int ret = -1;
if (!(map = ppc64LoadMap()))
goto error;
if (models) {
if (VIR_ALLOC_N(*models, map->nmodels + 1) < 0)
goto error;
for (i = 0; i < map->nmodels; i++) {
if (VIR_STRDUP((*models)[i], map->models[i]->name) < 0)
goto error;
}
}
ret = map->nmodels;
cleanup:
ppc64MapFree(map);
return ret;
error:
if (models) {
virStringListFree(*models);
*models = NULL;
}
goto cleanup;
}
struct cpuArchDriver cpuDriverPPC64 = {
.name = "ppc64",
.arch = archs,
.narch = ARRAY_CARDINALITY(archs),
.compare = virCPUppc64Compare,
.decode = ppc64DriverDecode,
.encode = NULL,
.dataFree = virCPUppc64DataFree,
.getHost = virCPUppc64GetHost,
.baseline = virCPUppc64Baseline,
.update = virCPUppc64Update,
.getModels = virCPUppc64DriverGetModels,
.convertLegacy = virCPUppc64ConvertLegacy,
};
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