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ppc: Add a core_index to CPUPPCState for SMT vCPUs 

The way SMT thread siblings are matched is clunky, using hard-coded
logic that checks the PIR SPR.

Change that to use a new core_index variable in the CPUPPCState,
where all siblings have the same core_index. CPU realize routines have
flexibility in setting core/sibling topology.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2024-05-16 15:25:12 +10:00
parent 25de28220c
commit feb37fdc82
3 changed files with 11 additions and 4 deletions
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2
hw/ppc/pnv_core.c
View File

@ -249,6 +249,8 @@ static void pnv_core_cpu_realize(PnvCore *pc, PowerPCCPU *cpu, Error **errp,
pir_spr->default_value = pir;
tir_spr->default_value = tir;
env->core_index = core_hwid;
/* Set time-base frequency to 512 MHz */
cpu_ppc_tb_init(env, PNV_TIMEBASE_FREQ);
}

4
hw/ppc/spapr_cpu_core.c
View File

@ -300,11 +300,13 @@ static PowerPCCPU *spapr_create_vcpu(SpaprCpuCore *sc, int i, Error **errp)
g_autofree char *id = NULL;
CPUState *cs;
PowerPCCPU *cpu;
CPUPPCState *env;
obj = object_new(scc->cpu_type);
cs = CPU(obj);
cpu = POWERPC_CPU(obj);
env = &cpu->env;
/*
* All CPUs start halted. CPU0 is unhalted from the machine level reset code
* and the rest are explicitly started up by the guest using an RTAS call.
@ -315,6 +317,8 @@ static PowerPCCPU *spapr_create_vcpu(SpaprCpuCore *sc, int i, Error **errp)
return NULL;
}
env->core_index = cc->core_id;
cpu->node_id = sc->node_id;
id = g_strdup_printf("thread[%d]", i);

9
target/ppc/cpu.h
View File

@ -1247,6 +1247,9 @@ struct CPUArchState {
/* when a memory exception occurs, the access type is stored here */
int access_type;
/* For SMT processors */
int core_index;
#if !defined(CONFIG_USER_ONLY)
/* MMU context, only relevant for full system emulation */
#if defined(TARGET_PPC64)
@ -1402,12 +1405,10 @@ struct CPUArchState {
uint64_t pmu_base_time;
};
#define _CORE_ID(cs) \
(POWERPC_CPU(cs)->env.spr_cb[SPR_PIR].default_value & ~(cs->nr_threads - 1))
#define THREAD_SIBLING_FOREACH(cs, cs_sibling) \
CPU_FOREACH(cs_sibling) \
if (_CORE_ID(cs) == _CORE_ID(cs_sibling))
if (POWERPC_CPU(cs)->env.core_index == \
POWERPC_CPU(cs_sibling)->env.core_index)
#define SET_FIT_PERIOD(a_, b_, c_, d_) \
do { \