From patchwork Thu Oct 27 15:10:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alex_Benn=C3=A9e?= X-Patchwork-Id: 79730 Delivered-To: patch@linaro.org Received: by 10.80.142.83 with SMTP id 19csp716455edx; Thu, 27 Oct 2016 08:44:42 -0700 (PDT) X-Received: by 10.176.84.208 with SMTP id q16mr6909378uaa.35.1477583082056; Thu, 27 Oct 2016 08:44:42 -0700 (PDT) Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id 91si3580523uar.218.2016.10.27.08.44.41 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 27 Oct 2016 08:44:42 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-devel-bounces+patch=linaro.org@nongnu.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:42385 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzmrB-0006ri-2v for patch@linaro.org; Thu, 27 Oct 2016 11:44:41 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42642) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzmKs-0004ko-0j for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bzmKn-0007i8-03 for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:17 -0400 Received: from mail-wm0-x22f.google.com ([2a00:1450:400c:c09::22f]:38665) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1bzmKm-0007hA-LE for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:12 -0400 Received: by mail-wm0-x22f.google.com with SMTP id n67so50403519wme.1 for ; Thu, 27 Oct 2016 08:11:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Zu5w8Iwx1wu6quS4cEuXSh+UKilbCVF5+PK2yMLPS7c=; b=VhC+1o/R8E6E6xKHZ0Ue8v1IH9Tufmmv2xwpLt7CGD7QYCKlLcSX/qWUSJzOx7Ml0J pvVkfS+ULzMEk4oGMinZK+/mEHjVnFU3TZhZ0AZgcqCpZj1nWn0bPMldx33FZvsy3QDE Zd4Y2FwQa480IdwAwDORc9KONTihF/oDy0Sm8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Zu5w8Iwx1wu6quS4cEuXSh+UKilbCVF5+PK2yMLPS7c=; b=dUWCHH1KzsCr1jy6FdsIGxcEEwQuhq9vKOrVmEgsLBE3ordOuf2ueFLz+rBcSTHp43 /YiIRkeKpkZHSejPTA/LNYwld+UMR7j3u2VaGH/PGvhhPpDdP7D2w/GMzyu4JOxeQ5He XvzxIqjsTeRCzsjMcCCo5PPlcgoYZBbwcdaRGxDbNuF92A8eNPhghYRaNrpg0t5vMsXq 7UqICOfQWHWnSPqEw2mf8AXpV4Q+LteMyop9Mu8EQj/jns6oKhiJkdmw7SRj/YHr96tO zQW0sAXv7PvbrVOLXZzDSFnQUNrydloryBkjBiqtswvgN5B5c0Y/goJIw6+zwYE0BXfx xwMQ== X-Gm-Message-State: ABUngvfAMyrawO4d2VB4Jy48iqZy3Fi7emVrf7HxjE9b6dw8QAyXg6go05b5hGjNJzq4ABGb X-Received: by 10.28.9.195 with SMTP id 186mr15444211wmj.117.1477581071252; Thu, 27 Oct 2016 08:11:11 -0700 (PDT) Received: from zen.linaro.local ([81.128.185.34]) by smtp.gmail.com with ESMTPSA id k74sm3777084wmd.18.2016.10.27.08.11.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Oct 2016 08:11:04 -0700 (PDT) Received: from zen.linaroharston (localhost [127.0.0.1]) by zen.linaro.local (Postfix) with ESMTP id 5A3463E0360; Thu, 27 Oct 2016 16:11:00 +0100 (BST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: pbonzini@redhat.com Date: Thu, 27 Oct 2016 16:10:13 +0100 Message-Id: <20161027151030.20863-17-alex.bennee@linaro.org> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161027151030.20863-1-alex.bennee@linaro.org> References: <20161027151030.20863-1-alex.bennee@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a00:1450:400c:c09::22f Subject: [Qemu-devel] [PATCH v5 16/33] tcg: drop global lock during TCG code execution X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mttcg@listserver.greensocs.com, peter.maydell@linaro.org, claudio.fontana@huawei.com, nikunj@linux.vnet.ibm.com, Peter Crosthwaite , jan.kiszka@siemens.com, "Michael S. Tsirkin" , mark.burton@greensocs.com, a.rigo@virtualopensystems.com, Eduardo Habkost , qemu-devel@nongnu.org, Alexander Graf , cota@braap.org, "open list:sPAPR" , David Gibson , serge.fdrv@gmail.com, bobby.prani@gmail.com, rth@twiddle.net, =?UTF-8?q?Alex=20Benn=C3=A9e?= , fred.konrad@greensocs.com Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Jan Kiszka This finally allows TCG to benefit from the iothread introduction: Drop the global mutex while running pure TCG CPU code. Reacquire the lock when entering MMIO or PIO emulation, or when leaving the TCG loop. We have to revert a few optimization for the current TCG threading model, namely kicking the TCG thread in qemu_mutex_lock_iothread and not kicking it in qemu_cpu_kick. We also need to disable RAM block reordering until we have a more efficient locking mechanism at hand. Still, a Linux x86 UP guest and my Musicpal ARM model boot fine here. These numbers demonstrate where we gain something: 20338 jan 20 0 331m 75m 6904 R 99 0.9 0:50.95 qemu-system-arm 20337 jan 20 0 331m 75m 6904 S 20 0.9 0:26.50 qemu-system-arm The guest CPU was fully loaded, but the iothread could still run mostly independent on a second core. Without the patch we don't get beyond 32206 jan 20 0 330m 73m 7036 R 82 0.9 1:06.00 qemu-system-arm 32204 jan 20 0 330m 73m 7036 S 21 0.9 0:17.03 qemu-system-arm We don't benefit significantly, though, when the guest is not fully loading a host CPU. Signed-off-by: Jan Kiszka Message-Id: <1439220437-23957-10-git-send-email-fred.konrad@greensocs.com> [FK: Rebase, fix qemu_devices_reset deadlock, rm address_space_* mutex] Signed-off-by: KONRAD Frederic [EGC: fixed iothread lock for cpu-exec IRQ handling] Signed-off-by: Emilio G. Cota [AJB: -smp single-threaded fix, rm old info from commit msg, review updates] Signed-off-by: Alex BennĂ©e --- v5 (ajb, base patches): - added an assert to BQL unlock/lock functions instead of hanging - ensure all cpu->interrupt_requests *modifications* protected by BQL - add a re-read on cpu->interrupt_request for correctness - BQL fixes for: - assert BQL held for PPC hypercalls (emulate_spar_hypercall) - SCLP service calls on s390x - merge conflict with kick timer patch v4 (ajb, base patches): - protect cpu->interrupt updates with BQL - fix wording io_mem_notdirty calls - s/we/with/ v3 (ajb, base-patches): - stale iothread_unlocks removed (cpu_exit/resume_from_signal deals with it in the longjmp). - fix re-base conflicts v2 (ajb): - merge with tcg: grab iothread lock in cpu-exec interrupt handling - use existing fns for tracking lock state - lock iothread for mem_region - add assert on mem region modification - ensure smm_helper holds iothread - Add JK s-o-b - Fix-up FK s-o-b annotation v1 (ajb, base-patches): - SMP failure now fixed by previous commit Changes from Fred Konrad (mttcg-v7 via paolo): * Rebase on the current HEAD. * Fixes a deadlock in qemu_devices_reset(). * Remove the mutex in address_space_* --- cpu-exec.c | 20 ++++++++++++++++++-- cpus.c | 28 +++++----------------------- cputlb.c | 21 ++++++++++++++++++++- exec.c | 12 +++++++++--- hw/core/irq.c | 1 + hw/i386/kvmvapic.c | 4 ++-- hw/ppc/spapr.c | 3 +++ include/qom/cpu.h | 1 + memory.c | 2 ++ qom/cpu.c | 10 ++++++++++ target-i386/smm_helper.c | 7 +++++++ target-s390x/misc_helper.c | 5 ++++- translate-all.c | 11 +++++++++-- translate-common.c | 21 +++++++++++---------- 14 files changed, 102 insertions(+), 44 deletions(-) -- 2.10.1 diff --git a/cpu-exec.c b/cpu-exec.c index 6ea5507..3ca44bd 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -29,6 +29,7 @@ #include "qemu/rcu.h" #include "exec/tb-hash.h" #include "exec/log.h" +#include "qemu/main-loop.h" #if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY) #include "hw/i386/apic.h" #endif @@ -388,8 +389,10 @@ static inline bool cpu_handle_halt(CPUState *cpu) if ((cpu->interrupt_request & CPU_INTERRUPT_POLL) && replay_interrupt()) { X86CPU *x86_cpu = X86_CPU(cpu); + qemu_mutex_lock_iothread(); apic_poll_irq(x86_cpu->apic_state); cpu_reset_interrupt(cpu, CPU_INTERRUPT_POLL); + qemu_mutex_unlock_iothread(); } #endif if (!cpu_has_work(cpu)) { @@ -443,7 +446,9 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret) #else if (replay_exception()) { CPUClass *cc = CPU_GET_CLASS(cpu); + qemu_mutex_lock_iothread(); cc->do_interrupt(cpu); + qemu_mutex_unlock_iothread(); cpu->exception_index = -1; } else if (!replay_has_interrupt()) { /* give a chance to iothread in replay mode */ @@ -469,9 +474,11 @@ static inline void cpu_handle_interrupt(CPUState *cpu, TranslationBlock **last_tb) { CPUClass *cc = CPU_GET_CLASS(cpu); - int interrupt_request = cpu->interrupt_request; - if (unlikely(interrupt_request)) { + if (unlikely(atomic_read(&cpu->interrupt_request))) { + int interrupt_request; + qemu_mutex_lock_iothread(); + interrupt_request = cpu->interrupt_request; if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) { /* Mask out external interrupts for this step. */ interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK; @@ -526,7 +533,12 @@ static inline void cpu_handle_interrupt(CPUState *cpu, the program flow was changed */ *last_tb = NULL; } + + /* If we exit via cpu_loop_exit/longjmp it is reset in cpu_exec */ + qemu_mutex_unlock_iothread(); } + + if (unlikely(atomic_read(&cpu->exit_request) || replay_has_interrupt())) { atomic_set(&cpu->exit_request, 0); cpu->exception_index = EXCP_INTERRUPT; @@ -656,8 +668,12 @@ int cpu_exec(CPUState *cpu) g_assert(cpu == current_cpu); g_assert(cc == CPU_GET_CLASS(cpu)); #endif /* buggy compiler */ + cpu->can_do_io = 1; tb_lock_reset(); + if (qemu_mutex_iothread_locked()) { + qemu_mutex_unlock_iothread(); + } } } /* for(;;) */ diff --git a/cpus.c b/cpus.c index c6ff79f..aca2a2e 100644 --- a/cpus.c +++ b/cpus.c @@ -993,8 +993,6 @@ static void qemu_kvm_init_cpu_signals(CPUState *cpu) #endif /* _WIN32 */ static QemuMutex qemu_global_mutex; -static QemuCond qemu_io_proceeded_cond; -static unsigned iothread_requesting_mutex; static QemuThread io_thread; @@ -1008,7 +1006,6 @@ void qemu_init_cpu_loop(void) qemu_init_sigbus(); qemu_cond_init(&qemu_cpu_cond); qemu_cond_init(&qemu_pause_cond); - qemu_cond_init(&qemu_io_proceeded_cond); qemu_mutex_init(&qemu_global_mutex); qemu_thread_get_self(&io_thread); @@ -1051,10 +1048,6 @@ static void qemu_tcg_wait_io_event(CPUState *cpu) start_tcg_kick_timer(); - while (iothread_requesting_mutex) { - qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex); - } - CPU_FOREACH(cpu) { qemu_wait_io_event_common(cpu); } @@ -1203,9 +1196,11 @@ static int tcg_cpu_exec(CPUState *cpu) cpu->icount_decr.u16.low = decr; cpu->icount_extra = count; } + qemu_mutex_unlock_iothread(); cpu_exec_start(cpu); ret = cpu_exec(cpu); cpu_exec_end(cpu); + qemu_mutex_lock_iothread(); #ifdef CONFIG_PROFILER tcg_time += profile_getclock() - ti; #endif @@ -1385,27 +1380,14 @@ bool qemu_mutex_iothread_locked(void) void qemu_mutex_lock_iothread(void) { - atomic_inc(&iothread_requesting_mutex); - /* In the simple case there is no need to bump the VCPU thread out of - * TCG code execution. - */ - if (!tcg_enabled() || qemu_in_vcpu_thread() || - !first_cpu || !first_cpu->created) { - qemu_mutex_lock(&qemu_global_mutex); - atomic_dec(&iothread_requesting_mutex); - } else { - if (qemu_mutex_trylock(&qemu_global_mutex)) { - qemu_cpu_kick_rr_cpu(); - qemu_mutex_lock(&qemu_global_mutex); - } - atomic_dec(&iothread_requesting_mutex); - qemu_cond_broadcast(&qemu_io_proceeded_cond); - } + g_assert(!qemu_mutex_iothread_locked()); + qemu_mutex_lock(&qemu_global_mutex); iothread_locked = true; } void qemu_mutex_unlock_iothread(void) { + g_assert(qemu_mutex_iothread_locked()); iothread_locked = false; qemu_mutex_unlock(&qemu_global_mutex); } diff --git a/cputlb.c b/cputlb.c index cc4da4d..986efaa 100644 --- a/cputlb.c +++ b/cputlb.c @@ -18,6 +18,7 @@ */ #include "qemu/osdep.h" +#include "qemu/main-loop.h" #include "cpu.h" #include "exec/exec-all.h" #include "exec/memory.h" @@ -505,6 +506,7 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry, hwaddr physaddr = iotlbentry->addr; MemoryRegion *mr = iotlb_to_region(cpu, physaddr, iotlbentry->attrs); uint64_t val; + bool locked = false; physaddr = (physaddr & TARGET_PAGE_MASK) + addr; cpu->mem_io_pc = retaddr; @@ -513,7 +515,16 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry, } cpu->mem_io_vaddr = addr; + + if (mr->global_locking) { + qemu_mutex_lock_iothread(); + locked = true; + } memory_region_dispatch_read(mr, physaddr, &val, size, iotlbentry->attrs); + if (locked) { + qemu_mutex_unlock_iothread(); + } + return val; } @@ -524,15 +535,23 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry, CPUState *cpu = ENV_GET_CPU(env); hwaddr physaddr = iotlbentry->addr; MemoryRegion *mr = iotlb_to_region(cpu, physaddr, iotlbentry->attrs); + bool locked = false; physaddr = (physaddr & TARGET_PAGE_MASK) + addr; if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu->can_do_io) { cpu_io_recompile(cpu, retaddr); } - cpu->mem_io_vaddr = addr; cpu->mem_io_pc = retaddr; + + if (mr->global_locking) { + qemu_mutex_lock_iothread(); + locked = true; + } memory_region_dispatch_write(mr, physaddr, val, size, iotlbentry->attrs); + if (locked) { + qemu_mutex_unlock_iothread(); + } } /* Return true if ADDR is present in the victim tlb, and has been copied diff --git a/exec.c b/exec.c index 30ae278..8db5545 100644 --- a/exec.c +++ b/exec.c @@ -2024,9 +2024,9 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) } cpu->watchpoint_hit = wp; - /* The tb_lock will be reset when cpu_loop_exit or - * cpu_loop_exit_noexc longjmp back into the cpu_exec - * main loop. + /* Both tb_lock and iothread_mutex will be reset when + * cpu_loop_exit or cpu_loop_exit_noexc longjmp + * back into the cpu_exec main loop. */ tb_lock(); tb_check_watchpoint(cpu); @@ -2262,8 +2262,14 @@ static void io_mem_init(void) memory_region_init_io(&io_mem_rom, NULL, &unassigned_mem_ops, NULL, NULL, UINT64_MAX); memory_region_init_io(&io_mem_unassigned, NULL, &unassigned_mem_ops, NULL, NULL, UINT64_MAX); + + /* io_mem_notdirty calls tb_invalidate_phys_page_fast, + * which can be called without the iothread mutex. + */ memory_region_init_io(&io_mem_notdirty, NULL, ¬dirty_mem_ops, NULL, NULL, UINT64_MAX); + memory_region_clear_global_locking(&io_mem_notdirty); + memory_region_init_io(&io_mem_watch, NULL, &watch_mem_ops, NULL, NULL, UINT64_MAX); } diff --git a/hw/core/irq.c b/hw/core/irq.c index 49ff2e6..b98d1d6 100644 --- a/hw/core/irq.c +++ b/hw/core/irq.c @@ -22,6 +22,7 @@ * THE SOFTWARE. */ #include "qemu/osdep.h" +#include "qemu/main-loop.h" #include "qemu-common.h" #include "hw/irq.h" #include "qom/object.h" diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c index 4448253..3be6b96 100644 --- a/hw/i386/kvmvapic.c +++ b/hw/i386/kvmvapic.c @@ -450,8 +450,8 @@ static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip) resume_all_vcpus(); if (!kvm_enabled()) { - /* tb_lock will be reset when cpu_loop_exit_noexc longjmps - * back into the cpu_exec loop. */ + /* Both tb_lock and iothread_mutex will be reset when + * longjmps back into the cpu_exec loop. */ tb_lock(); tb_gen_code(cs, current_pc, current_cs_base, current_flags, 1); cpu_loop_exit_noexc(cs); diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index ddb7438..63df95b 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1023,6 +1023,9 @@ static void emulate_spapr_hypercall(PowerPCCPU *cpu) { CPUPPCState *env = &cpu->env; + /* The TCG path should also be holding the BQL at this point */ + g_assert(qemu_mutex_iothread_locked()); + if (msr_pr) { hcall_dprintf("Hypercall made with MSR[PR]=1\n"); env->gpr[3] = H_PRIVILEGE; diff --git a/include/qom/cpu.h b/include/qom/cpu.h index d268e20..0c44b3c 100644 --- a/include/qom/cpu.h +++ b/include/qom/cpu.h @@ -305,6 +305,7 @@ struct CPUState { bool unplug; bool crash_occurred; bool exit_request; + /* updates protected by BQL */ uint32_t interrupt_request; int singlestep_enabled; int64_t icount_extra; diff --git a/memory.c b/memory.c index 58f9269..7a67c05 100644 --- a/memory.c +++ b/memory.c @@ -925,6 +925,8 @@ void memory_region_transaction_commit(void) AddressSpace *as; assert(memory_region_transaction_depth); + assert(qemu_mutex_iothread_locked()); + --memory_region_transaction_depth; if (!memory_region_transaction_depth) { if (memory_region_update_pending) { diff --git a/qom/cpu.c b/qom/cpu.c index c40f774..4817cd4 100644 --- a/qom/cpu.c +++ b/qom/cpu.c @@ -113,9 +113,19 @@ static void cpu_common_get_memory_mapping(CPUState *cpu, error_setg(errp, "Obtaining memory mappings is unsupported on this CPU."); } +/* Resetting the IRQ comes from across the code base so we take the + * BQL here if we need to. cpu_interrupt assumes it is held.*/ void cpu_reset_interrupt(CPUState *cpu, int mask) { + bool need_lock = !qemu_mutex_iothread_locked(); + + if (need_lock) { + qemu_mutex_lock_iothread(); + } cpu->interrupt_request &= ~mask; + if (need_lock) { + qemu_mutex_unlock_iothread(); + } } void cpu_exit(CPUState *cpu) diff --git a/target-i386/smm_helper.c b/target-i386/smm_helper.c index 4dd6a2c..f051a77 100644 --- a/target-i386/smm_helper.c +++ b/target-i386/smm_helper.c @@ -18,6 +18,7 @@ */ #include "qemu/osdep.h" +#include "qemu/main-loop.h" #include "cpu.h" #include "exec/helper-proto.h" #include "exec/log.h" @@ -42,11 +43,14 @@ void helper_rsm(CPUX86State *env) #define SMM_REVISION_ID 0x00020000 #endif +/* Called with iothread lock taken */ void cpu_smm_update(X86CPU *cpu) { CPUX86State *env = &cpu->env; bool smm_enabled = (env->hflags & HF_SMM_MASK); + g_assert(qemu_mutex_iothread_locked()); + if (cpu->smram) { memory_region_set_enabled(cpu->smram, smm_enabled); } @@ -333,7 +337,10 @@ void helper_rsm(CPUX86State *env) } env->hflags2 &= ~HF2_SMM_INSIDE_NMI_MASK; env->hflags &= ~HF_SMM_MASK; + + qemu_mutex_lock_iothread(); cpu_smm_update(cpu); + qemu_mutex_unlock_iothread(); qemu_log_mask(CPU_LOG_INT, "SMM: after RSM\n"); log_cpu_state_mask(CPU_LOG_INT, CPU(cpu), CPU_DUMP_CCOP); diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c index 4df2ec6..5851e4d 100644 --- a/target-s390x/misc_helper.c +++ b/target-s390x/misc_helper.c @@ -25,6 +25,7 @@ #include "exec/helper-proto.h" #include "sysemu/kvm.h" #include "qemu/timer.h" +#include "qemu/main-loop.h" #include "exec/address-spaces.h" #ifdef CONFIG_KVM #include @@ -109,11 +110,13 @@ void program_interrupt(CPUS390XState *env, uint32_t code, int ilen) /* SCLP service call */ uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2) { + qemu_mutex_lock_iothread(); int r = sclp_service_call(env, r1, r2); if (r < 0) { program_interrupt(env, -r, 4); - return 0; + r = 0; } + qemu_mutex_unlock_iothread(); return r; } diff --git a/translate-all.c b/translate-all.c index 1237f3c..23a2170 100644 --- a/translate-all.c +++ b/translate-all.c @@ -55,6 +55,7 @@ #include "translate-all.h" #include "qemu/bitmap.h" #include "qemu/timer.h" +#include "qemu/main-loop.h" #include "exec/log.h" /* #define DEBUG_TB_INVALIDATE */ @@ -1503,7 +1504,9 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end, } #ifdef CONFIG_SOFTMMU -/* len must be <= 8 and start must be a multiple of len */ +/* len must be <= 8 and start must be a multiple of len. + * Called via softmmu_template.h, with iothread mutex not held. + */ void tb_invalidate_phys_page_fast(tb_page_addr_t start, int len) { PageDesc *p; @@ -1698,7 +1701,10 @@ void tb_check_watchpoint(CPUState *cpu) #ifndef CONFIG_USER_ONLY /* in deterministic execution mode, instructions doing device I/Os - must be at the end of the TB */ + * must be at the end of the TB. + * + * Called by softmmu_template.h, with iothread mutex not held. + */ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) { #if defined(TARGET_MIPS) || defined(TARGET_SH4) @@ -1910,6 +1916,7 @@ void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf) void cpu_interrupt(CPUState *cpu, int mask) { + g_assert(qemu_mutex_iothread_locked()); cpu->interrupt_request |= mask; cpu->tcg_exit_req = 1; } diff --git a/translate-common.c b/translate-common.c index 5e989cd..d504dd0 100644 --- a/translate-common.c +++ b/translate-common.c @@ -21,6 +21,7 @@ #include "qemu-common.h" #include "qom/cpu.h" #include "sysemu/cpus.h" +#include "qemu/main-loop.h" uintptr_t qemu_real_host_page_size; intptr_t qemu_real_host_page_mask; @@ -30,6 +31,7 @@ intptr_t qemu_real_host_page_mask; static void tcg_handle_interrupt(CPUState *cpu, int mask) { int old_mask; + g_assert(qemu_mutex_iothread_locked()); old_mask = cpu->interrupt_request; cpu->interrupt_request |= mask; @@ -40,17 +42,16 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask) */ if (!qemu_cpu_is_self(cpu)) { qemu_cpu_kick(cpu); - return; - } - - if (use_icount) { - cpu->icount_decr.u16.high = 0xffff; - if (!cpu->can_do_io - && (mask & ~old_mask) != 0) { - cpu_abort(cpu, "Raised interrupt while not in I/O function"); - } } else { - cpu->tcg_exit_req = 1; + if (use_icount) { + cpu->icount_decr.u16.high = 0xffff; + if (!cpu->can_do_io + && (mask & ~old_mask) != 0) { + cpu_abort(cpu, "Raised interrupt while not in I/O function"); + } + } else { + cpu->tcg_exit_req = 1; + } } }