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ppc: Add has_smt_siblings property to CPUPPCState 

The decision to branch out to a slower SMT path in instruction
emulation will become a bit more complicated with the way that
"big-core" topology that will be implemented in subsequent changes.
Hide these details from the wider CPU emulation code with a bool
has_smt_siblings flag that can be set by machine initialisation.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2024-06-18 12:56:53 +10:00
parent 50d8cfb949
commit 59c921f229
3 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hw/ppc/pnv_core.c
View File

@ -288,6 +288,9 @@ static void pnv_core_realize(DeviceState *dev, Error **errp)
cpu = POWERPC_CPU(obj);
pc->threads[i] = POWERPC_CPU(obj);
if (cc->nr_threads > 1) {
cpu->env.has_smt_siblings = true;
}
snprintf(name, sizeof(name), "thread[%d]", i);
object_property_add_child(OBJECT(pc), name, obj);

12
hw/ppc/spapr_cpu_core.c
View File

@ -349,9 +349,15 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp)
qemu_register_reset(spapr_cpu_core_reset_handler, sc);
sc->threads = g_new0(PowerPCCPU *, cc->nr_threads);
for (i = 0; i < cc->nr_threads; i++) {
sc->threads[i] = spapr_create_vcpu(sc, i, errp);
if (!sc->threads[i] ||
!spapr_realize_vcpu(sc->threads[i], spapr, sc, i, errp)) {
PowerPCCPU *cpu;
cpu = spapr_create_vcpu(sc, i, errp);
sc->threads[i] = cpu;
if (cpu && cc->nr_threads > 1) {
cpu->env.has_smt_siblings = true;
}
if (!cpu || !spapr_realize_vcpu(cpu, spapr, sc, i, errp)) {
spapr_cpu_core_unrealize(dev);
return;
}

3
target/ppc/cpu.h
View File

@ -1248,6 +1248,7 @@ struct CPUArchState {
int access_type;
/* For SMT processors */
bool has_smt_siblings;
int core_index;
#if !defined(CONFIG_USER_ONLY)
@ -1514,7 +1515,7 @@ struct PowerPCCPUClass {
static inline bool ppc_cpu_core_single_threaded(CPUState *cs)
{
return cs->nr_threads == 1;
return !POWERPC_CPU(cs)->env.has_smt_siblings;
}
static inline bool ppc_cpu_lpar_single_threaded(CPUState *cs)