diff options
Diffstat (limited to 'target/ppc/compat.c')
| -rw-r--r-- | target/ppc/compat.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/target/ppc/compat.c b/target/ppc/compat.c new file mode 100644 index 0000000000..458da262be --- /dev/null +++ b/target/ppc/compat.c @@ -0,0 +1,185 @@ +/* + * 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 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 "cpu-models.h" + +typedef struct { + uint32_t pvr; + uint64_t pcr; + uint64_t pcr_level; + int max_threads; +} CompatInfo; + +static const CompatInfo compat_table[] = { + /* + * Ordered from oldest to newest - the code relies on this + */ + { /* POWER6, ISA2.05 */ + .pvr = CPU_POWERPC_LOGICAL_2_05, + .pcr = 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_threads = 2, + }, + { /* POWER7, ISA2.06 */ + .pvr = CPU_POWERPC_LOGICAL_2_06, + .pcr = PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, + .pcr_level = PCR_COMPAT_2_06, + .max_threads = 4, + }, + { + .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS, + .pcr = PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, + .pcr_level = PCR_COMPAT_2_06, + .max_threads = 4, + }, + { /* POWER8, ISA2.07 */ + .pvr = CPU_POWERPC_LOGICAL_2_07, + .pcr = PCR_COMPAT_2_07, + .pcr_level = PCR_COMPAT_2_07, + .max_threads = 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; +} + +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); + 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); + +#if !defined(CONFIG_USER_ONLY) + g_assert(cpu->vhyp); +#endif + 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; +} + +void 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; + } 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; + } else { + pcr = compat->pcr; + } + + cpu_synchronize_state(CPU(cpu)); + + cpu->compat_pvr = compat_pvr; + env->spr[SPR_PCR] = pcr & pcc->pcr_mask; + + if (kvm_enabled()) { + int ret = kvmppc_set_compat(cpu, cpu->compat_pvr); + if (ret < 0) { + error_setg_errno(errp, -ret, + "Unable to set CPU compatibility mode in KVM"); + } + } +} + +typedef struct { + uint32_t compat_pvr; + Error *err; +} SetCompatState; + +static void do_set_compat(CPUState *cs, run_on_cpu_data arg) +{ + PowerPCCPU *cpu = POWERPC_CPU(cs); + SetCompatState *s = arg.host_ptr; + + ppc_set_compat(cpu, s->compat_pvr, &s->err); +} + +void ppc_set_compat_all(uint32_t compat_pvr, Error **errp) +{ + CPUState *cs; + + CPU_FOREACH(cs) { + SetCompatState s = { + .compat_pvr = compat_pvr, + .err = NULL, + }; + + run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s)); + + if (s.err) { + error_propagate(errp, s.err); + return; + } + } +} + +int ppc_compat_max_threads(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_threads); + } + + return n_threads; +} |