From patchwork Wed Oct 14 19:23:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudio Fontana X-Patchwork-Id: 11838239 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 11C701592 for ; Wed, 14 Oct 2020 19:33:24 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9FD0F2222C for ; Wed, 14 Oct 2020 19:33:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9FD0F2222C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:47636 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSmWY-0003gj-Cf for patchwork-qemu-devel@patchwork.kernel.org; Wed, 14 Oct 2020 15:33:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42016) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSmN2-0001AA-Cp for qemu-devel@nongnu.org; Wed, 14 Oct 2020 15:23:32 -0400 Received: from mx2.suse.de ([195.135.220.15]:34278) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSmN0-00022f-8N for qemu-devel@nongnu.org; Wed, 14 Oct 2020 15:23:32 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id AFA0EB2A1; Wed, 14 Oct 2020 19:23:27 +0000 (UTC) From: Claudio Fontana To: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson , =?utf-8?q?Alex_Benn=C3=A9?= =?utf-8?q?e?= Subject: [PATCH v2 2/3] accel/tcg: split tcg_start_vcpu_thread Date: Wed, 14 Oct 2020 21:23:23 +0200 Message-Id: <20201014192324.6390-3-cfontana@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201014192324.6390-1-cfontana@suse.de> References: <20201014192324.6390-1-cfontana@suse.de> MIME-Version: 1.0 Received-SPF: pass client-ip=195.135.220.15; envelope-from=cfontana@suse.de; helo=mx2.suse.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/12 01:21:00 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x (no timestamps) [generic] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Claudio Fontana , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" after the initial split into 3 tcg variants, we proceed to also split tcg_start_vcpu_thread. We actually split it in 2 this time, since the icount variant just uses the round robin function. Suggested-by: Richard Henderson Signed-off-by: Claudio Fontana --- accel/tcg/tcg-all.c | 5 ++++ accel/tcg/tcg-cpus-icount.c | 2 +- accel/tcg/tcg-cpus-mttcg.c | 29 +++++++++++++++++-- accel/tcg/tcg-cpus-mttcg.h | 10 ------- accel/tcg/tcg-cpus-rr.c | 39 +++++++++++++++++++++++-- accel/tcg/tcg-cpus-rr.h | 4 +-- accel/tcg/tcg-cpus.c | 58 ------------------------------------- accel/tcg/tcg-cpus.h | 1 - 8 files changed, 71 insertions(+), 77 deletions(-) diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index e42a028043..1ac0b76515 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -105,6 +105,11 @@ static int tcg_init(MachineState *ms) tcg_exec_init(s->tb_size * 1024 * 1024); mttcg_enabled = s->mttcg_enabled; + /* + * Initialize TCG regions + */ + tcg_region_init(); + if (mttcg_enabled) { cpus_register_accel(&tcg_cpus_mttcg); } else if (icount_enabled()) { diff --git a/accel/tcg/tcg-cpus-icount.c b/accel/tcg/tcg-cpus-icount.c index d3af3afb6d..82dbe2cacf 100644 --- a/accel/tcg/tcg-cpus-icount.c +++ b/accel/tcg/tcg-cpus-icount.c @@ -138,7 +138,7 @@ static void icount_handle_interrupt(CPUState *cpu, int mask) } const CpusAccel tcg_cpus_icount = { - .create_vcpu_thread = tcg_start_vcpu_thread, + .create_vcpu_thread = rr_start_vcpu_thread, .kick_vcpu_thread = qemu_cpu_kick_rr_cpus, .handle_interrupt = icount_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-mttcg.c b/accel/tcg/tcg-cpus-mttcg.c index 723703fa3e..619718c994 100644 --- a/accel/tcg/tcg-cpus-mttcg.c +++ b/accel/tcg/tcg-cpus-mttcg.c @@ -33,7 +33,6 @@ #include "hw/boards.h" #include "tcg-cpus.h" -#include "tcg-cpus-mttcg.h" /* * Multi-threaded TCG @@ -43,7 +42,7 @@ * current CPUState for a given thread. */ -void *tcg_cpu_thread_fn(void *arg) +static void *tcg_cpu_thread_fn(void *arg) { CPUState *cpu = arg; @@ -111,8 +110,32 @@ static void mttcg_kick_vcpu_thread(CPUState *cpu) cpu_exit(cpu); } +static void mttcg_start_vcpu_thread(CPUState *cpu) +{ + char thread_name[VCPU_THREAD_NAME_SIZE]; + + g_assert(tcg_enabled()); + + parallel_cpus = (current_machine->smp.max_cpus > 1); + + cpu->thread = g_malloc0(sizeof(QemuThread)); + cpu->halt_cond = g_malloc0(sizeof(QemuCond)); + qemu_cond_init(cpu->halt_cond); + + /* create a thread per vCPU with TCG (MTTCG) */ + snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", + cpu->cpu_index); + + qemu_thread_create(cpu->thread, thread_name, tcg_cpu_thread_fn, + cpu, QEMU_THREAD_JOINABLE); + +#ifdef _WIN32 + cpu->hThread = qemu_thread_get_handle(cpu->thread); +#endif +} + const CpusAccel tcg_cpus_mttcg = { - .create_vcpu_thread = tcg_start_vcpu_thread, + .create_vcpu_thread = mttcg_start_vcpu_thread, .kick_vcpu_thread = mttcg_kick_vcpu_thread, .handle_interrupt = tcg_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-mttcg.h b/accel/tcg/tcg-cpus-mttcg.h index 5d203243e8..6a70dcb5d6 100644 --- a/accel/tcg/tcg-cpus-mttcg.h +++ b/accel/tcg/tcg-cpus-mttcg.h @@ -10,14 +10,4 @@ #ifndef TCG_CPUS_MTTCG_H #define TCG_CPUS_MTTCG_H -/* - * Multi-threaded TCG - * - * In the multi-threaded case each vCPU has its own thread. The TLS - * variable current_cpu can be used deep in the code to find the - * current CPUState for a given thread. - */ - -void *tcg_cpu_thread_fn(void *arg); - #endif /* TCG_CPUS_MTTCG_H */ diff --git a/accel/tcg/tcg-cpus-rr.c b/accel/tcg/tcg-cpus-rr.c index 82bb7c5ea6..31ec37915a 100644 --- a/accel/tcg/tcg-cpus-rr.c +++ b/accel/tcg/tcg-cpus-rr.c @@ -146,7 +146,7 @@ static void deal_with_unplugged_cpus(void) * elsewhere. */ -void *tcg_rr_cpu_thread_fn(void *arg) +static void *tcg_rr_cpu_thread_fn(void *arg) { CPUState *cpu = arg; @@ -264,8 +264,43 @@ void *tcg_rr_cpu_thread_fn(void *arg) return NULL; } +void rr_start_vcpu_thread(CPUState *cpu) +{ + char thread_name[VCPU_THREAD_NAME_SIZE]; + static QemuCond *single_tcg_halt_cond; + static QemuThread *single_tcg_cpu_thread; + + g_assert(tcg_enabled()); + parallel_cpus = false; + + if (!single_tcg_cpu_thread) { + cpu->thread = g_malloc0(sizeof(QemuThread)); + cpu->halt_cond = g_malloc0(sizeof(QemuCond)); + qemu_cond_init(cpu->halt_cond); + + /* share a single thread for all cpus with TCG */ + snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); + qemu_thread_create(cpu->thread, thread_name, + tcg_rr_cpu_thread_fn, + cpu, QEMU_THREAD_JOINABLE); + + single_tcg_halt_cond = cpu->halt_cond; + single_tcg_cpu_thread = cpu->thread; +#ifdef _WIN32 + cpu->hThread = qemu_thread_get_handle(cpu->thread); +#endif + } else { + /* we share the thread */ + cpu->thread = single_tcg_cpu_thread; + cpu->halt_cond = single_tcg_halt_cond; + cpu->thread_id = first_cpu->thread_id; + cpu->can_do_io = 1; + cpu->created = true; + } +} + const CpusAccel tcg_cpus_rr = { - .create_vcpu_thread = tcg_start_vcpu_thread, + .create_vcpu_thread = rr_start_vcpu_thread, .kick_vcpu_thread = qemu_cpu_kick_rr_cpus, .handle_interrupt = tcg_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-rr.h b/accel/tcg/tcg-cpus-rr.h index 12463b0b93..2e5943eda9 100644 --- a/accel/tcg/tcg-cpus-rr.h +++ b/accel/tcg/tcg-cpus-rr.h @@ -15,7 +15,7 @@ /* Kick all RR vCPUs. */ void qemu_cpu_kick_rr_cpus(CPUState *unused); -/* Single-threaded TCG */ -void *tcg_rr_cpu_thread_fn(void *arg); +/* start the round robin vcpu thread */ +void rr_start_vcpu_thread(CPUState *cpu); #endif /* TCG_CPUS_RR_H */ diff --git a/accel/tcg/tcg-cpus.c b/accel/tcg/tcg-cpus.c index 60d307dba1..fa70237414 100644 --- a/accel/tcg/tcg-cpus.c +++ b/accel/tcg/tcg-cpus.c @@ -35,67 +35,9 @@ #include "hw/boards.h" #include "tcg-cpus.h" -#include "tcg-cpus-mttcg.h" -#include "tcg-cpus-rr.h" /* common functionality among all TCG variants */ -void tcg_start_vcpu_thread(CPUState *cpu) -{ - char thread_name[VCPU_THREAD_NAME_SIZE]; - static QemuCond *single_tcg_halt_cond; - static QemuThread *single_tcg_cpu_thread; - static int tcg_region_inited; - - assert(tcg_enabled()); - /* - * Initialize TCG regions--once. Now is a good time, because: - * (1) TCG's init context, prologue and target globals have been set up. - * (2) qemu_tcg_mttcg_enabled() works now (TCG init code runs before the - * -accel flag is processed, so the check doesn't work then). - */ - if (!tcg_region_inited) { - tcg_region_inited = 1; - tcg_region_init(); - parallel_cpus = qemu_tcg_mttcg_enabled() && current_machine->smp.max_cpus > 1; - } - - if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { - cpu->thread = g_malloc0(sizeof(QemuThread)); - cpu->halt_cond = g_malloc0(sizeof(QemuCond)); - qemu_cond_init(cpu->halt_cond); - - if (qemu_tcg_mttcg_enabled()) { - /* create a thread per vCPU with TCG (MTTCG) */ - snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", - cpu->cpu_index); - - qemu_thread_create(cpu->thread, thread_name, tcg_cpu_thread_fn, - cpu, QEMU_THREAD_JOINABLE); - - } else { - /* share a single thread for all cpus with TCG */ - snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); - qemu_thread_create(cpu->thread, thread_name, - tcg_rr_cpu_thread_fn, - cpu, QEMU_THREAD_JOINABLE); - - single_tcg_halt_cond = cpu->halt_cond; - single_tcg_cpu_thread = cpu->thread; - } -#ifdef _WIN32 - cpu->hThread = qemu_thread_get_handle(cpu->thread); -#endif - } else { - /* For non-MTTCG cases we share the thread */ - cpu->thread = single_tcg_cpu_thread; - cpu->halt_cond = single_tcg_halt_cond; - cpu->thread_id = first_cpu->thread_id; - cpu->can_do_io = 1; - cpu->created = true; - } -} - void qemu_tcg_destroy_vcpu(CPUState *cpu) { cpu_thread_signal_destroyed(cpu); diff --git a/accel/tcg/tcg-cpus.h b/accel/tcg/tcg-cpus.h index cb61aed1cc..21419d1117 100644 --- a/accel/tcg/tcg-cpus.h +++ b/accel/tcg/tcg-cpus.h @@ -18,7 +18,6 @@ extern const CpusAccel tcg_cpus_mttcg; extern const CpusAccel tcg_cpus_icount; extern const CpusAccel tcg_cpus_rr; -void tcg_start_vcpu_thread(CPUState *cpu); void qemu_tcg_destroy_vcpu(CPUState *cpu); int tcg_cpu_exec(CPUState *cpu); void tcg_handle_interrupt(CPUState *cpu, int mask);