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Mon, 08 Sep 2025 03:13:10 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE2pJGIYWJwE6StkLzHGPEjPIaEYufrfU5jk2BSgO6+GpS2gJl2d1sVD2m5rotGThxWdauADg== X-Received: by 2002:a05:6000:1a87:b0:3e2:e851:7f93 with SMTP id ffacd0b85a97d-3e300ae3446mr10075220f8f.7.1757326390104; Mon, 08 Sep 2025 03:13:10 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Igor Mammedov , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson Subject: [PATCH 11/19] accel/tcg: create a thread-kick function for TCG Date: Mon, 8 Sep 2025 12:12:33 +0200 Message-ID: <20250908101241.2110068-12-pbonzini@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250908101241.2110068-1-pbonzini@redhat.com> References: <20250908101241.2110068-1-pbonzini@redhat.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=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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 @redhat.com) X-ZM-MESSAGEID: 1757326561823124100 Round-robin TCG is calling into cpu_exit() directly. In preparation for making cpu_exit() usable from all accelerators, define a generic thread-kick function for TCG which is used directly in the multi-threaded case, and through CPU_FOREACH in the round-robin case. Use it also for user-mode emulation, and take the occasion to move the implementation to accel/tcg/user-exec.c. Reviewed-by: Igor Mammedov Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson Signed-off-by: Paolo Bonzini --- docs/devel/tcg-icount.rst | 2 +- accel/tcg/tcg-accel-ops-mttcg.h | 3 --- accel/tcg/tcg-accel-ops.h | 1 + accel/tcg/cpu-exec.c | 6 ++++++ accel/tcg/tcg-accel-ops-mttcg.c | 5 ----- accel/tcg/tcg-accel-ops-rr.c | 2 +- accel/tcg/tcg-accel-ops.c | 2 +- accel/tcg/user-exec.c | 6 ++++++ bsd-user/main.c | 5 ----- linux-user/main.c | 5 ----- 10 files changed, 16 insertions(+), 21 deletions(-) diff --git a/docs/devel/tcg-icount.rst b/docs/devel/tcg-icount.rst index 7df883446a7..a1dcd79e0fd 100644 --- a/docs/devel/tcg-icount.rst +++ b/docs/devel/tcg-icount.rst @@ -37,7 +37,7 @@ translator starts by allocating a budget of instructions = to be executed. The budget of instructions is limited by how long it will be until the next timer will expire. We store this budget as part of a vCPU icount_decr field which shared with the machinery for handling -cpu_exit(). The whole field is checked at the start of every +qemu_cpu_kick(). The whole field is checked at the start of every translated block and will cause a return to the outer loop to deal with whatever caused the exit. =20 diff --git a/accel/tcg/tcg-accel-ops-mttcg.h b/accel/tcg/tcg-accel-ops-mttc= g.h index 8ffa7a9a9fe..5c145cc8595 100644 --- a/accel/tcg/tcg-accel-ops-mttcg.h +++ b/accel/tcg/tcg-accel-ops-mttcg.h @@ -10,9 +10,6 @@ #ifndef TCG_ACCEL_OPS_MTTCG_H #define TCG_ACCEL_OPS_MTTCG_H =20 -/* kick MTTCG vCPU thread */ -void mttcg_kick_vcpu_thread(CPUState *cpu); - /* start an mttcg vCPU thread */ void mttcg_start_vcpu_thread(CPUState *cpu); =20 diff --git a/accel/tcg/tcg-accel-ops.h b/accel/tcg/tcg-accel-ops.h index 6feeb3f3e9b..aecce605d7b 100644 --- a/accel/tcg/tcg-accel-ops.h +++ b/accel/tcg/tcg-accel-ops.h @@ -18,5 +18,6 @@ void tcg_cpu_destroy(CPUState *cpu); int tcg_cpu_exec(CPUState *cpu); void tcg_handle_interrupt(CPUState *cpu, int mask); void tcg_cpu_init_cflags(CPUState *cpu, bool parallel); +void tcg_kick_vcpu_thread(CPUState *cpu); =20 #endif /* TCG_ACCEL_OPS_H */ diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index f838535d111..9241bcadb5f 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -40,6 +40,7 @@ #include "exec/replay-core.h" #include "system/tcg.h" #include "exec/helper-proto-common.h" +#include "tcg-accel-ops.h" #include "tb-jmp-cache.h" #include "tb-hash.h" #include "tb-context.h" @@ -748,6 +749,11 @@ static inline bool cpu_handle_exception(CPUState *cpu,= int *ret) return false; } =20 +void tcg_kick_vcpu_thread(CPUState *cpu) +{ + cpu_exit(cpu); +} + static inline bool icount_exit_request(CPUState *cpu) { if (!icount_enabled()) { diff --git a/accel/tcg/tcg-accel-ops-mttcg.c b/accel/tcg/tcg-accel-ops-mttc= g.c index b12b7a36b5d..1148ebcaae5 100644 --- a/accel/tcg/tcg-accel-ops-mttcg.c +++ b/accel/tcg/tcg-accel-ops-mttcg.c @@ -123,11 +123,6 @@ static void *mttcg_cpu_thread_fn(void *arg) return NULL; } =20 -void mttcg_kick_vcpu_thread(CPUState *cpu) -{ - cpu_exit(cpu); -} - void mttcg_start_vcpu_thread(CPUState *cpu) { char thread_name[VCPU_THREAD_NAME_SIZE]; diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c index d13e0d8b44d..a1d75fd3419 100644 --- a/accel/tcg/tcg-accel-ops-rr.c +++ b/accel/tcg/tcg-accel-ops-rr.c @@ -43,7 +43,7 @@ void rr_kick_vcpu_thread(CPUState *unused) CPUState *cpu; =20 CPU_FOREACH(cpu) { - cpu_exit(cpu); + tcg_kick_vcpu_thread(cpu); }; } =20 diff --git a/accel/tcg/tcg-accel-ops.c b/accel/tcg/tcg-accel-ops.c index 9c37266c1e0..1f662a9c745 100644 --- a/accel/tcg/tcg-accel-ops.c +++ b/accel/tcg/tcg-accel-ops.c @@ -206,7 +206,7 @@ static void tcg_accel_ops_init(AccelClass *ac) =20 if (qemu_tcg_mttcg_enabled()) { ops->create_vcpu_thread =3D mttcg_start_vcpu_thread; - ops->kick_vcpu_thread =3D mttcg_kick_vcpu_thread; + ops->kick_vcpu_thread =3D tcg_kick_vcpu_thread; ops->handle_interrupt =3D tcg_handle_interrupt; } else { ops->create_vcpu_thread =3D rr_start_vcpu_thread; diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 66c25fba7dd..3c072fd868f 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -38,6 +38,7 @@ #include "qemu/int128.h" #include "trace.h" #include "tcg/tcg-ldst.h" +#include "tcg-accel-ops.h" #include "backend-ldst.h" #include "internal-common.h" #include "tb-internal.h" @@ -46,6 +47,11 @@ __thread uintptr_t helper_retaddr; =20 //#define DEBUG_SIGNAL =20 +void qemu_cpu_kick(CPUState *cpu) +{ + tcg_kick_vcpu_thread(cpu); +} + /* * Adjust the pc to pass to cpu_restore_state; return the memop type. */ diff --git a/bsd-user/main.c b/bsd-user/main.c index 9ba69642f50..73aae8c3274 100644 --- a/bsd-user/main.c +++ b/bsd-user/main.c @@ -214,11 +214,6 @@ bool qemu_cpu_is_self(CPUState *cpu) return thread_cpu =3D=3D cpu; } =20 -void qemu_cpu_kick(CPUState *cpu) -{ - cpu_exit(cpu); -} - /* Assumes contents are already zeroed. */ static void init_task_state(TaskState *ts) { diff --git a/linux-user/main.c b/linux-user/main.c index 7b0ccb6fd60..4ddfc9a619c 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -189,11 +189,6 @@ bool qemu_cpu_is_self(CPUState *cpu) return thread_cpu =3D=3D cpu; } =20 -void qemu_cpu_kick(CPUState *cpu) -{ - cpu_exit(cpu); -} - void task_settid(TaskState *ts) { if (ts->ts_tid =3D=3D 0) { --=20 2.51.0