From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54885) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1anSyD-0006v7-RQ for qemu-devel@nongnu.org; Tue, 05 Apr 2016 11:32:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1anSy9-0007FV-PQ for qemu-devel@nongnu.org; Tue, 05 Apr 2016 11:32:45 -0400 Received: from mail-wm0-x229.google.com ([2a00:1450:400c:c09::229]:34458) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1anSy9-0007FP-FA for qemu-devel@nongnu.org; Tue, 05 Apr 2016 11:32:41 -0400 Received: by mail-wm0-x229.google.com with SMTP id l6so28824895wml.1 for ; Tue, 05 Apr 2016 08:32:41 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Tue, 5 Apr 2016 16:32:20 +0100 Message-Id: <1459870344-16773-8-git-send-email-alex.bennee@linaro.org> In-Reply-To: <1459870344-16773-1-git-send-email-alex.bennee@linaro.org> References: <1459870344-16773-1-git-send-email-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [RFC v2 07/11] tcg: cpus rm tcg_exec_all() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: mttcg@listserver.greensocs.com, fred.konrad@greensocs.com, a.rigo@virtualopensystems.com, serge.fdrv@gmail.com, cota@braap.org Cc: peter.maydell@linaro.org, claudio.fontana@huawei.com, Peter Crosthwaite , jan.kiszka@siemens.com, mark.burton@greensocs.com, qemu-devel@nongnu.org, pbonzini@redhat.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , rth@twiddle.net In preparation for multi-threaded TCG we remove tcg_exec_all and move all the CPU cycling into the main thread function. When MTTCG is enabled we shall use a separate thread function which only handles one vCPU. Signed-off-by: Alex Bennée --- v2 - update timer calls to new API on rebase --- cpus.c | 63 +++++++++++++++++++++++++++++---------------------------------- 1 file changed, 29 insertions(+), 34 deletions(-) diff --git a/cpus.c b/cpus.c index e118fdf..46732a5 100644 --- a/cpus.c +++ b/cpus.c @@ -67,7 +67,6 @@ #endif /* CONFIG_LINUX */ -static CPUState *next_cpu; int64_t max_delay; int64_t max_advance; @@ -1109,7 +1108,7 @@ static void *qemu_dummy_cpu_thread_fn(void *arg) #endif } -static void tcg_exec_all(void); +static int tcg_cpu_exec(CPUState *cpu); static void *qemu_tcg_cpu_thread_fn(void *arg) { @@ -1140,8 +1139,35 @@ static void *qemu_tcg_cpu_thread_fn(void *arg) /* process any pending work */ atomic_mb_set(&exit_request, 1); + cpu = first_cpu; + while (1) { - tcg_exec_all(); + /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ + qemu_account_warp_timer(); + + if (!cpu) { + cpu = first_cpu; + } + + for (; cpu != NULL && !exit_request; cpu = CPU_NEXT(cpu)) { + + qemu_clock_enable(QEMU_CLOCK_VIRTUAL, + (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); + + if (cpu_can_run(cpu)) { + int r = tcg_cpu_exec(cpu); + if (r == EXCP_DEBUG) { + cpu_handle_guest_debug(cpu); + break; + } + } else if (cpu->stop || cpu->stopped) { + break; + } + + } /* for cpu.. */ + + /* Pairs with smp_wmb in qemu_cpu_kick. */ + atomic_mb_set(&exit_request, 0); if (use_icount) { int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); @@ -1500,37 +1526,6 @@ static int tcg_cpu_exec(CPUState *cpu) return ret; } -static void tcg_exec_all(void) -{ - int r; - - /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ - qemu_account_warp_timer(); - - if (next_cpu == NULL) { - next_cpu = first_cpu; - } - for (; next_cpu != NULL && !exit_request; next_cpu = CPU_NEXT(next_cpu)) { - CPUState *cpu = next_cpu; - - qemu_clock_enable(QEMU_CLOCK_VIRTUAL, - (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); - - if (cpu_can_run(cpu)) { - r = tcg_cpu_exec(cpu); - if (r == EXCP_DEBUG) { - cpu_handle_guest_debug(cpu); - break; - } - } else if (cpu->stop || cpu->stopped) { - break; - } - } - - /* Pairs with smp_wmb in qemu_cpu_kick. */ - atomic_mb_set(&exit_request, 0); -} - void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) { /* XXX: implement xxx_cpu_list for targets that still miss it */ -- 2.7.4