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Tue, 16 Jul 2024 09:26:59 -0700 (PDT) From: Nicholas Piggin To: qemu-ppc@nongnu.org Cc: Nicholas Piggin , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Barrat?= , Harsh Prateek Bora , qemu-devel@nongnu.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v3 09/19] ppc: Add has_smt_siblings property to CPUPPCState Date: Wed, 17 Jul 2024 02:26:05 +1000 Message-ID: <20240716162617.32161-10-npiggin@gmail.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240716162617.32161-1-npiggin@gmail.com> References: <20240716162617.32161-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::431; envelope-from=npiggin@gmail.com; helo=mail-pf1-x431.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1721147322591116600 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: C=C3=A9dric Le Goater Signed-off-by: Nicholas Piggin --- target/ppc/cpu.h | 3 ++- hw/ppc/pnv_core.c | 3 +++ hw/ppc/spapr_cpu_core.c | 12 +++++++++--- 3 files changed, 14 insertions(+), 4 deletions(-) diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 417b284318..321ed2da75 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -1248,6 +1248,7 @@ struct CPUArchState { int access_type; =20 /* For SMT processors */ + bool has_smt_siblings; int core_index; =20 #if !defined(CONFIG_USER_ONLY) @@ -1514,7 +1515,7 @@ struct PowerPCCPUClass { =20 static inline bool ppc_cpu_core_single_threaded(CPUState *cs) { - return cs->nr_threads =3D=3D 1; + return !POWERPC_CPU(cs)->env.has_smt_siblings; } =20 static inline bool ppc_cpu_lpar_single_threaded(CPUState *cs) diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c index 7bda29b9c7..8cfa94fbfa 100644 --- a/hw/ppc/pnv_core.c +++ b/hw/ppc/pnv_core.c @@ -288,6 +288,9 @@ static void pnv_core_realize(DeviceState *dev, Error **= errp) cpu =3D POWERPC_CPU(obj); =20 pc->threads[i] =3D POWERPC_CPU(obj); + if (cc->nr_threads > 1) { + cpu->env.has_smt_siblings =3D true; + } =20 snprintf(name, sizeof(name), "thread[%d]", i); object_property_add_child(OBJECT(pc), name, obj); diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index 4e13e6993a..2c6eeb41a4 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -351,9 +351,15 @@ static void spapr_cpu_core_realize(DeviceState *dev, E= rror **errp) qemu_register_reset(spapr_cpu_core_reset_handler, sc); sc->threads =3D g_new0(PowerPCCPU *, cc->nr_threads); for (i =3D 0; i < cc->nr_threads; i++) { - sc->threads[i] =3D spapr_create_vcpu(sc, i, errp); - if (!sc->threads[i] || - !spapr_realize_vcpu(sc->threads[i], spapr, sc, i, errp)) { + PowerPCCPU *cpu; + + cpu =3D spapr_create_vcpu(sc, i, errp); + sc->threads[i] =3D cpu; + if (cpu && cc->nr_threads > 1) { + cpu->env.has_smt_siblings =3D true; + } + + if (!cpu || !spapr_realize_vcpu(cpu, spapr, sc, i, errp)) { spapr_cpu_core_unrealize(dev); return; } --=20 2.45.1