From patchwork Wed Feb 3 08:53:40 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 44366 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id CB778B7D2C for ; Wed, 3 Feb 2010 20:53:23 +1100 (EST) Received: from localhost ([127.0.0.1]:56991 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NcbvE-0004UK-Pc for incoming@patchwork.ozlabs.org; Wed, 03 Feb 2010 04:53:20 -0500 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NcbXK-0007gU-DA for qemu-devel@nongnu.org; Wed, 03 Feb 2010 04:28:38 -0500 Received: from [199.232.76.173] (port=39859 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NcbXJ-0007fx-OK for qemu-devel@nongnu.org; Wed, 03 Feb 2010 04:28:37 -0500 Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) (envelope-from ) id 1NcbXH-0002AD-BE for qemu-devel@nongnu.org; Wed, 03 Feb 2010 04:28:37 -0500 Received: from david.siemens.de ([192.35.17.14]:21036) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NcbXG-00029j-Na for qemu-devel@nongnu.org; Wed, 03 Feb 2010 04:28:35 -0500 Received: from mail3.siemens.de (localhost [127.0.0.1]) by david.siemens.de (8.12.11.20060308/8.12.11) with ESMTP id o138ruvB031154; Wed, 3 Feb 2010 09:53:56 +0100 Received: from localhost.localdomain ([139.25.173.28]) by mail3.siemens.de (8.12.11.20060308/8.12.11) with ESMTP id o138rkCG012112; Wed, 3 Feb 2010 09:53:55 +0100 From: Jan Kiszka To: Avi Kivity , Marcelo Tosatti Date: Wed, 3 Feb 2010 09:53:40 +0100 Message-Id: <4609282077d082071258bdc86142a5a53880e3f9.1265187223.git.jan.kiszka@siemens.com> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: References: In-Reply-To: References: X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.4-2.6 Cc: Anthony Liguori , Glauber Costa , Alexander Graf , kvm@vger.kernel.org, qemu-devel@nongnu.org Subject: [Qemu-devel] [PATCH v2 15/21] qemu-kvm: Clean up mpstate synchronization X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Push mpstate reading/writing into kvm_arch_load/save_regs and, on x86, properly synchronize with halted in the accessor functions. Signed-off-by: Jan Kiszka --- hw/apic.c | 7 --- qemu-kvm-ia64.c | 4 +- qemu-kvm-x86.c | 102 ++++++++++++++++++++++++++++++------------------- qemu-kvm.c | 30 -------------- qemu-kvm.h | 15 ------- target-i386/machine.c | 6 --- target-ia64/machine.c | 3 + 7 files changed, 69 insertions(+), 98 deletions(-) diff --git a/hw/apic.c b/hw/apic.c index 3e03e10..092c61e 100644 --- a/hw/apic.c +++ b/hw/apic.c @@ -507,13 +507,6 @@ void apic_init_reset(CPUState *env) s->wait_for_sipi = 1; env->halted = !(s->apicbase & MSR_IA32_APICBASE_BSP); -#ifdef KVM_CAP_MP_STATE - if (kvm_enabled() && kvm_irqchip_in_kernel()) { - env->mp_state - = env->halted ? KVM_MP_STATE_UNINITIALIZED : KVM_MP_STATE_RUNNABLE; - kvm_load_mpstate(env); - } -#endif } static void apic_startup(APICState *s, int vector_num) diff --git a/qemu-kvm-ia64.c b/qemu-kvm-ia64.c index fc8110e..39bcbeb 100644 --- a/qemu-kvm-ia64.c +++ b/qemu-kvm-ia64.c @@ -124,7 +124,9 @@ void kvm_arch_cpu_reset(CPUState *env) { if (kvm_irqchip_in_kernel(kvm_context)) { #ifdef KVM_CAP_MP_STATE - kvm_reset_mpstate(env->kvm_cpu_state.vcpu_ctx); + struct kvm_mp_state mp_state = {.mp_state = KVM_MP_STATE_UNINITIALIZED + }; + kvm_set_mpstate(env, &mp_state); #endif } else { env->interrupt_request &= ~CPU_INTERRUPT_HARD; diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c index 49e2743..c6cf317 100644 --- a/qemu-kvm-x86.c +++ b/qemu-kvm-x86.c @@ -754,6 +754,56 @@ static int get_msr_entry(struct kvm_msr_entry *entry, CPUState *env) return 0; } +static void kvm_arch_save_mpstate(CPUState *env) +{ +#ifdef KVM_CAP_MP_STATE + int r; + struct kvm_mp_state mp_state; + + r = kvm_get_mpstate(env, &mp_state); + if (r < 0) { + env->mp_state = -1; + } else { + env->mp_state = mp_state.mp_state; + if (kvm_irqchip_in_kernel()) { + env->halted = (env->mp_state == KVM_MP_STATE_HALTED); + } + } +#else + env->mp_state = -1; +#endif +} + +static void kvm_arch_load_mpstate(CPUState *env) +{ +#ifdef KVM_CAP_MP_STATE + struct kvm_mp_state mp_state; + + /* + * -1 indicates that the host did not support GET_MP_STATE ioctl, + * so don't touch it. + */ + if (env->mp_state != -1) { + mp_state.mp_state = env->mp_state; + kvm_set_mpstate(env, &mp_state); + } +#endif +} + +static void kvm_reset_mpstate(CPUState *env) +{ +#ifdef KVM_CAP_MP_STATE + if (env->mp_state != -1) { + if (kvm_irqchip_in_kernel()) { + env->mp_state = cpu_is_bsp(env) ? KVM_MP_STATE_RUNNABLE : + KVM_MP_STATE_UNINITIALIZED; + } else { + env->mp_state = KVM_MP_STATE_RUNNABLE; + } + } +#endif +} + static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs) { lhs->selector = rhs->selector; @@ -928,6 +978,14 @@ void kvm_arch_load_regs(CPUState *env, int level) rc = kvm_set_msrs(env, msrs, n); if (rc == -1) perror("kvm_set_msrs FAILED"); + + if (level >= KVM_PUT_RESET_STATE) { + kvm_arch_load_mpstate(env); + } + if (kvm_irqchip_in_kernel()) { + /* Avoid deadlock: no user space IRQ will ever clear it. */ + env->halted = 0; + } } void kvm_load_tsc(CPUState *env) @@ -942,36 +1000,6 @@ void kvm_load_tsc(CPUState *env) perror("kvm_set_tsc FAILED.\n"); } -void kvm_arch_save_mpstate(CPUState *env) -{ -#ifdef KVM_CAP_MP_STATE - int r; - struct kvm_mp_state mp_state; - - r = kvm_get_mpstate(env, &mp_state); - if (r < 0) - env->mp_state = -1; - else - env->mp_state = mp_state.mp_state; -#else - env->mp_state = -1; -#endif -} - -void kvm_arch_load_mpstate(CPUState *env) -{ -#ifdef KVM_CAP_MP_STATE - struct kvm_mp_state mp_state = { .mp_state = env->mp_state }; - - /* - * -1 indicates that the host did not support GET_MP_STATE ioctl, - * so don't touch it. - */ - if (env->mp_state != -1) - kvm_set_mpstate(env, &mp_state); -#endif -} - void kvm_arch_save_regs(CPUState *env) { struct kvm_regs regs; @@ -1297,6 +1325,7 @@ int kvm_arch_init_vcpu(CPUState *cenv) #ifdef KVM_EXIT_TPR_ACCESS kvm_tpr_vcpu_start(cenv); #endif + kvm_reset_mpstate(cenv); return 0; } @@ -1370,15 +1399,10 @@ void kvm_arch_cpu_reset(CPUState *env) { kvm_arch_reset_vcpu(env); kvm_put_vcpu_events(env); - if (!cpu_is_bsp(env)) { - if (kvm_irqchip_in_kernel()) { -#ifdef KVM_CAP_MP_STATE - kvm_reset_mpstate(env); -#endif - } else { - env->interrupt_request &= ~CPU_INTERRUPT_HARD; - env->halted = 1; - } + kvm_reset_mpstate(env); + if (!cpu_is_bsp(env) && !kvm_irqchip_in_kernel()) { + env->interrupt_request &= ~CPU_INTERRUPT_HARD; + env->halted = 1; } } diff --git a/qemu-kvm.c b/qemu-kvm.c index f08bc4b..851330c 100644 --- a/qemu-kvm.c +++ b/qemu-kvm.c @@ -1579,36 +1579,6 @@ void kvm_update_interrupt_request(CPUState *env) } } -static void kvm_do_load_mpstate(void *_env) -{ - CPUState *env = _env; - - kvm_arch_load_mpstate(env); -} - -void kvm_load_mpstate(CPUState *env) -{ - if (kvm_enabled() && qemu_system_ready && kvm_vcpu_inited(env)) - on_vcpu(env, kvm_do_load_mpstate, env); -} - -static void kvm_do_save_mpstate(void *_env) -{ - CPUState *env = _env; - - kvm_arch_save_mpstate(env); -#ifdef KVM_CAP_MP_STATE - if (kvm_irqchip_in_kernel()) - env->halted = (env->mp_state == KVM_MP_STATE_HALTED); -#endif -} - -void kvm_save_mpstate(CPUState *env) -{ - if (kvm_enabled()) - on_vcpu(env, kvm_do_save_mpstate, env); -} - int kvm_cpu_exec(CPUState *env) { int r; diff --git a/qemu-kvm.h b/qemu-kvm.h index 92e0684..ca5c700 100644 --- a/qemu-kvm.h +++ b/qemu-kvm.h @@ -299,16 +299,6 @@ int kvm_get_mpstate(CPUState *env, struct kvm_mp_state *mp_state); * */ int kvm_set_mpstate(CPUState *env, struct kvm_mp_state *mp_state); -/*! - * * \brief Reset VCPU MP state - * - */ -static inline int kvm_reset_mpstate(CPUState *env) -{ - struct kvm_mp_state mp_state = {.mp_state = KVM_MP_STATE_UNINITIALIZED - }; - return kvm_set_mpstate(env, &mp_state); -} #endif /*! @@ -874,8 +864,6 @@ static inline void kvm_inject_x86_mce(CPUState *cenv, int bank, int kvm_main_loop(void); int kvm_init_ap(void); int kvm_vcpu_inited(CPUState *env); -void kvm_load_mpstate(CPUState *env); -void kvm_save_mpstate(CPUState *env); void kvm_apic_init(CPUState *env); /* called from vcpu initialization */ void qemu_kvm_load_lapic(CPUState *env); @@ -909,8 +897,6 @@ int kvm_arch_qemu_create_context(void); void kvm_arch_save_regs(CPUState *env); void kvm_arch_load_regs(CPUState *env, int level); -void kvm_arch_load_mpstate(CPUState *env); -void kvm_arch_save_mpstate(CPUState *env); int kvm_arch_has_work(CPUState *env); void kvm_arch_process_irqchip_events(CPUState *env); int kvm_arch_try_push_interrupts(void *opaque); @@ -979,7 +965,6 @@ void kvm_load_tsc(CPUState *env); #ifdef TARGET_I386 #define qemu_kvm_has_pit_state2() (0) #endif -#define kvm_save_mpstate(env) do {} while(0) #define qemu_kvm_cpu_stop(env) do {} while(0) static inline void kvm_load_tsc(CPUState *env) { diff --git a/target-i386/machine.c b/target-i386/machine.c index bebde82..61e6a87 100644 --- a/target-i386/machine.c +++ b/target-i386/machine.c @@ -323,7 +323,6 @@ static void cpu_pre_save(void *opaque) int i; if (kvm_enabled()) { - kvm_save_mpstate(env); kvm_get_vcpu_events(env); } @@ -362,12 +361,7 @@ static int cpu_post_load(void *opaque, int version_id) tlb_flush(env, 1); if (kvm_enabled()) { - /* when in-kernel irqchip is used, env->halted causes deadlock - because no userspace IRQs will ever clear this flag */ - env->halted = 0; - kvm_load_tsc(env); - kvm_load_mpstate(env); kvm_put_vcpu_events(env); } diff --git a/target-ia64/machine.c b/target-ia64/machine.c index fdbeeef..8cf5bdd 100644 --- a/target-ia64/machine.c +++ b/target-ia64/machine.c @@ -4,6 +4,9 @@ #include "exec-all.h" #include "qemu-kvm.h" +void kvm_arch_save_mpstate(CPUState *env); +void kvm_arch_load_mpstate(CPUState *env); + void cpu_save(QEMUFile *f, void *opaque) { CPUState *env = opaque;