qemu/target/ppc/compat.c
Chetan Pant 6bd039cdbe powerpc tcg: Fix Lesser GPL version number
There is no "version 2" of the "Lesser" General Public License.
It is either "GPL version 2.0" or "Lesser GPL version 2.1".
This patch replaces all occurrences of "Lesser GPL version 2" with
"Lesser GPL version 2.1" in comment section.

Signed-off-by: Chetan Pant <chetan4windows@gmail.com>
Message-Id: <20201019061126.3102-1-chetan4windows@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-11-15 16:38:50 +01:00

328 lines
9.1 KiB
C

/*
* PowerPC CPU initialization for qemu.
*
* Copyright 2016, David Gibson, Red Hat Inc. <dgibson@redhat.com>
*
* 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 "qemu/osdep.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "kvm_ppc.h"
#include "sysemu/cpus.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "cpu-models.h"
typedef struct {
const char *name;
uint32_t pvr;
uint64_t pcr;
uint64_t pcr_level;
/*
* Maximum allowed virtual threads per virtual core
*
* This is to stop older guests getting confused by seeing more
* threads than they think the cpu can support. Usually it's
* equal to the number of threads supported on bare metal
* hardware, but not always (see POWER9).
*/
int max_vthreads;
} CompatInfo;
static const CompatInfo compat_table[] = {
/*
* Ordered from oldest to newest - the code relies on this
*/
{ /* POWER6, ISA2.05 */
.name = "power6",
.pvr = CPU_POWERPC_LOGICAL_2_05,
.pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 |
PCR_COMPAT_2_06 | PCR_COMPAT_2_05 | PCR_TM_DIS | PCR_VSX_DIS,
.pcr_level = PCR_COMPAT_2_05,
.max_vthreads = 2,
},
{ /* POWER7, ISA2.06 */
.name = "power7",
.pvr = CPU_POWERPC_LOGICAL_2_06,
.pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 |
PCR_COMPAT_2_06 | PCR_TM_DIS,
.pcr_level = PCR_COMPAT_2_06,
.max_vthreads = 4,
},
{
.name = "power7+",
.pvr = CPU_POWERPC_LOGICAL_2_06_PLUS,
.pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 |
PCR_COMPAT_2_06 | PCR_TM_DIS,
.pcr_level = PCR_COMPAT_2_06,
.max_vthreads = 4,
},
{ /* POWER8, ISA2.07 */
.name = "power8",
.pvr = CPU_POWERPC_LOGICAL_2_07,
.pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07,
.pcr_level = PCR_COMPAT_2_07,
.max_vthreads = 8,
},
{ /* POWER9, ISA3.00 */
.name = "power9",
.pvr = CPU_POWERPC_LOGICAL_3_00,
.pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00,
.pcr_level = PCR_COMPAT_3_00,
/*
* POWER9 hardware only supports 4 threads / core, but this
* limit is for guests. We need to support 8 vthreads/vcore
* on POWER9 for POWER8 compatibility guests, and it's very
* confusing if half of the threads disappear from the guest
* if it announces it's POWER9 aware at CAS time.
*/
.max_vthreads = 8,
},
{ /* POWER10, ISA3.10 */
.name = "power10",
.pvr = CPU_POWERPC_LOGICAL_3_10,
.pcr = PCR_COMPAT_3_10,
.pcr_level = PCR_COMPAT_3_10,
.max_vthreads = 8,
},
};
static const CompatInfo *compat_by_pvr(uint32_t pvr)
{
int i;
for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
if (compat_table[i].pvr == pvr) {
return &compat_table[i];
}
}
return NULL;
}
static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr,
uint32_t min_compat_pvr, uint32_t max_compat_pvr)
{
const CompatInfo *compat = compat_by_pvr(compat_pvr);
const CompatInfo *min = compat_by_pvr(min_compat_pvr);
const CompatInfo *max = compat_by_pvr(max_compat_pvr);
g_assert(!min_compat_pvr || min);
g_assert(!max_compat_pvr || max);
if (!compat) {
/* Not a recognized logical PVR */
return false;
}
if ((min && (compat < min)) || (max && (compat > max))) {
/* Outside specified range */
return false;
}
if (!(pcc->pcr_supported & compat->pcr_level)) {
/* Not supported by this CPU */
return false;
}
return true;
}
bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr,
uint32_t min_compat_pvr, uint32_t max_compat_pvr)
{
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
#if !defined(CONFIG_USER_ONLY)
g_assert(cpu->vhyp);
#endif
return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr);
}
bool ppc_type_check_compat(const char *cputype, uint32_t compat_pvr,
uint32_t min_compat_pvr, uint32_t max_compat_pvr)
{
PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(object_class_by_name(cputype));
return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr);
}
int ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp)
{
const CompatInfo *compat = compat_by_pvr(compat_pvr);
CPUPPCState *env = &cpu->env;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
uint64_t pcr;
if (!compat_pvr) {
pcr = 0;
} else if (!compat) {
error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr);
return -EINVAL;
} else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) {
error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU",
compat_pvr);
return -EINVAL;
} else {
pcr = compat->pcr;
}
cpu_synchronize_state(CPU(cpu));
if (kvm_enabled() && cpu->compat_pvr != compat_pvr) {
int ret = kvmppc_set_compat(cpu, compat_pvr);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Unable to set CPU compatibility mode in KVM");
return ret;
}
}
cpu->compat_pvr = compat_pvr;
env->spr[SPR_PCR] = pcr & pcc->pcr_mask;
return 0;
}
typedef struct {
uint32_t compat_pvr;
Error **errp;
int ret;
} SetCompatState;
static void do_set_compat(CPUState *cs, run_on_cpu_data arg)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
SetCompatState *s = arg.host_ptr;
s->ret = ppc_set_compat(cpu, s->compat_pvr, s->errp);
}
int ppc_set_compat_all(uint32_t compat_pvr, Error **errp)
{
CPUState *cs;
CPU_FOREACH(cs) {
SetCompatState s = {
.compat_pvr = compat_pvr,
.errp = errp,
.ret = 0,
};
run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s));
if (s.ret < 0) {
return s.ret;
}
}
return 0;
}
int ppc_compat_max_vthreads(PowerPCCPU *cpu)
{
const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr);
int n_threads = CPU(cpu)->nr_threads;
if (cpu->compat_pvr) {
g_assert(compat);
n_threads = MIN(n_threads, compat->max_vthreads);
}
return n_threads;
}
static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
uint32_t compat_pvr = *((uint32_t *)opaque);
const char *value;
if (!compat_pvr) {
value = "";
} else {
const CompatInfo *compat = compat_by_pvr(compat_pvr);
g_assert(compat);
value = compat->name;
}
visit_type_str(v, name, (char **)&value, errp);
}
static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
char *value;
uint32_t compat_pvr;
if (!visit_type_str(v, name, &value, errp)) {
return;
}
if (strcmp(value, "") == 0) {
compat_pvr = 0;
} else {
int i;
const CompatInfo *compat = NULL;
for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
if (strcmp(value, compat_table[i].name) == 0) {
compat = &compat_table[i];
break;
}
}
if (!compat) {
error_setg(errp, "Invalid compatibility mode \"%s\"", value);
goto out;
}
compat_pvr = compat->pvr;
}
*((uint32_t *)opaque) = compat_pvr;
out:
g_free(value);
}
void ppc_compat_add_property(Object *obj, const char *name,
uint32_t *compat_pvr, const char *basedesc)
{
gchar *namesv[ARRAY_SIZE(compat_table) + 1];
gchar *names, *desc;
int i;
object_property_add(obj, name, "string",
ppc_compat_prop_get, ppc_compat_prop_set, NULL,
compat_pvr);
for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
/*
* Have to discard const here, because g_strjoinv() takes
* (gchar **), not (const gchar **) :(
*/
namesv[i] = (gchar *)compat_table[i].name;
}
namesv[ARRAY_SIZE(compat_table)] = NULL;
names = g_strjoinv(", ", namesv);
desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names);
object_property_set_description(obj, name, desc);
g_free(names);
g_free(desc);
}