From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDDD0C07E9D for ; Tue, 27 Sep 2022 14:25:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231500AbiI0OZA (ORCPT ); Tue, 27 Sep 2022 10:25:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231436AbiI0OY5 (ORCPT ); Tue, 27 Sep 2022 10:24:57 -0400 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F04F26151 for ; Tue, 27 Sep 2022 07:24:53 -0700 (PDT) Received: by mail-wm1-x331.google.com with SMTP id n40-20020a05600c3ba800b003b49aefc35fso5533661wms.5 for ; Tue, 27 Sep 2022 07:24:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=uPWI1zT5RA3MTBLfOSsbd8UM7dwx7REeUZ6YlYd0oe4=; b=ku/FJr2y7hvg9lXsgzMSw75QzXdl7A8OeyfLtni1dK+UZsEFM8qyBjOX+NZe6Aslnx Vdyk3zIk6xYTz7LX0uoyHAfgZ6mFB6R1SYlajsC2oFrZSQnKq95hWLV/evKlWeghixiy KlTpqaEZSoTuzll3iWKXhVGUYly3CPR+Cez1n9Hyc2WF37xMFZ3u50Co33OaG2hD2DMI fz6pYTeK9GmKFznVS1RoHLaD6vDBPa5xVMbgOJ6VM4M4W7UQKaRISZvlJRGhz12jBRDZ z+H0oQoM0E0vyyK6+zKQerfvXSZlGCq2gaLOhUUXlfqc8YC592rFV7T4djNOIrSOzr4B 06Cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=uPWI1zT5RA3MTBLfOSsbd8UM7dwx7REeUZ6YlYd0oe4=; b=NGpqAeRUteJwh7yjsMh256DT9XMD24xN7FX7c51TP3u6izNrjbULDZpDWcb5CJJ2v2 Egw8YrycL/+CR9GlWi15zThd6mXmEkhFXQu5NRBrYTeflATIEXM2pfd5wQqEerWNtvAn tbHUYyVbJpnvyTFmWURhyIyFbAfxdHCZo9m+LzNPdXjwUDutOKrN7/yXFvJU/vTAd6op ef7QccnsKkx6QnumskpAgSrhM0fwGu4fUjXR9Fa23wiGgeaR0mEIleSt7EgSyLc3jTOU 1RCoTZuewKpK23V16pAINEpTB541mUk4wDiSESs2NQtNuPaQXgxC+0B0XDvkFSkxGchD YjqQ== X-Gm-Message-State: ACrzQf3xF50TOmozRfzhfXAHkRSG10ULR6QUZOl82HXbma09ivMu5CQJ YygIV6MRfF2pzlRALRCe1aVPc8GiFCN+ag== X-Google-Smtp-Source: AMsMyM4BxGWEY9vRhKdhPxaO1YN4ABxmLaFAs+scHIcrDWH/ivswDx0PIT3I3tiubaow+pymXk0v1A== X-Received: by 2002:a05:600c:1e24:b0:3b4:6c1e:8bb7 with SMTP id ay36-20020a05600c1e2400b003b46c1e8bb7mr3072568wmb.1.1664288692398; Tue, 27 Sep 2022 07:24:52 -0700 (PDT) Received: from zen.linaroharston ([185.81.254.11]) by smtp.gmail.com with ESMTPSA id x17-20020adff651000000b00228fa832b7asm1948368wrp.52.2022.09.27.07.24.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Sep 2022 07:24:51 -0700 (PDT) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id D4AC71FFC2; Tue, 27 Sep 2022 15:15:07 +0100 (BST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Mads Ynddal , Paolo Bonzini , kvm@vger.kernel.org (open list:Overall KVM CPUs) Subject: [PATCH v3 12/15] gdbstub: move sstep flags probing into AccelClass Date: Tue, 27 Sep 2022 15:15:01 +0100 Message-Id: <20220927141504.3886314-13-alex.bennee@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220927141504.3886314-1-alex.bennee@linaro.org> References: <20220927141504.3886314-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The support of single-stepping is very much dependent on support from the accelerator we are using. To avoid special casing in gdbstub move the probing out to an AccelClass function so future accelerators can put their code there. Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Alex Bennée Cc: Mads Ynddal --- include/qemu/accel.h | 12 ++++++++++++ include/sysemu/kvm.h | 8 -------- accel/accel-common.c | 10 ++++++++++ accel/kvm/kvm-all.c | 14 +++++++++++++- accel/tcg/tcg-all.c | 17 +++++++++++++++++ gdbstub/gdbstub.c | 22 ++++------------------ 6 files changed, 56 insertions(+), 27 deletions(-) diff --git a/include/qemu/accel.h b/include/qemu/accel.h index be56da1b99..ce4747634a 100644 --- a/include/qemu/accel.h +++ b/include/qemu/accel.h @@ -43,6 +43,10 @@ typedef struct AccelClass { bool (*has_memory)(MachineState *ms, AddressSpace *as, hwaddr start_addr, hwaddr size); #endif + + /* gdbstub related hooks */ + int (*gdbstub_supported_sstep_flags)(void); + bool *allowed; /* * Array of global properties that would be applied when specific @@ -92,4 +96,12 @@ void accel_cpu_instance_init(CPUState *cpu); */ bool accel_cpu_realizefn(CPUState *cpu, Error **errp); +/** + * accel_supported_gdbstub_sstep_flags: + * + * Returns the supported single step modes for the configured + * accelerator. + */ +int accel_supported_gdbstub_sstep_flags(void); + #endif /* QEMU_ACCEL_H */ diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index efd6dee818..a20ad51aad 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -47,7 +47,6 @@ extern bool kvm_direct_msi_allowed; extern bool kvm_ioeventfd_any_length_allowed; extern bool kvm_msi_use_devid; extern bool kvm_has_guest_debug; -extern int kvm_sstep_flags; #define kvm_enabled() (kvm_allowed) /** @@ -174,12 +173,6 @@ extern int kvm_sstep_flags; */ #define kvm_supports_guest_debug() (kvm_has_guest_debug) -/* - * kvm_supported_sstep_flags - * Returns: SSTEP_* flags that KVM supports for guest debug - */ -#define kvm_get_supported_sstep_flags() (kvm_sstep_flags) - #else #define kvm_enabled() (0) @@ -198,7 +191,6 @@ extern int kvm_sstep_flags; #define kvm_ioeventfd_any_length_enabled() (false) #define kvm_msi_devid_required() (false) #define kvm_supports_guest_debug() (false) -#define kvm_get_supported_sstep_flags() (0) #endif /* CONFIG_KVM_IS_POSSIBLE */ diff --git a/accel/accel-common.c b/accel/accel-common.c index 50035bda55..df72cc989a 100644 --- a/accel/accel-common.c +++ b/accel/accel-common.c @@ -129,6 +129,16 @@ bool accel_cpu_realizefn(CPUState *cpu, Error **errp) return true; } +int accel_supported_gdbstub_sstep_flags(void) +{ + AccelState *accel = current_accel(); + AccelClass *acc = ACCEL_GET_CLASS(accel); + if (acc->gdbstub_supported_sstep_flags) { + return acc->gdbstub_supported_sstep_flags(); + } + return 0; +} + static const TypeInfo accel_cpu_type = { .name = TYPE_ACCEL_CPU, .parent = TYPE_OBJECT, diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 5acab1767f..c55938453a 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -175,7 +175,7 @@ bool kvm_direct_msi_allowed; bool kvm_ioeventfd_any_length_allowed; bool kvm_msi_use_devid; bool kvm_has_guest_debug; -int kvm_sstep_flags; +static int kvm_sstep_flags; static bool kvm_immediate_exit; static hwaddr kvm_max_slot_size = ~0; @@ -3712,6 +3712,17 @@ static void kvm_accel_instance_init(Object *obj) s->kvm_dirty_ring_size = 0; } +/** + * kvm_gdbstub_sstep_flags(): + * + * Returns: SSTEP_* flags that KVM supports for guest debug. The + * support is probed during kvm_init() + */ +static int kvm_gdbstub_sstep_flags(void) +{ + return kvm_sstep_flags; +} + static void kvm_accel_class_init(ObjectClass *oc, void *data) { AccelClass *ac = ACCEL_CLASS(oc); @@ -3719,6 +3730,7 @@ static void kvm_accel_class_init(ObjectClass *oc, void *data) ac->init_machine = kvm_init; ac->has_memory = kvm_accel_has_memory; ac->allowed = &kvm_allowed; + ac->gdbstub_supported_sstep_flags = kvm_gdbstub_sstep_flags; object_class_property_add(oc, "kernel-irqchip", "on|off|split", NULL, kvm_set_kernel_irqchip, diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index 47952eecd7..30b503fb22 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -25,6 +25,7 @@ #include "qemu/osdep.h" #include "sysemu/tcg.h" +#include "sysemu/replay.h" #include "sysemu/cpu-timers.h" #include "tcg/tcg.h" #include "qapi/error.h" @@ -207,12 +208,28 @@ static void tcg_set_splitwx(Object *obj, bool value, Error **errp) s->splitwx_enabled = value; } +static int tcg_gdbstub_supported_sstep_flags(void) +{ + /* + * In replay mode all events will come from the log and can't be + * suppressed otherwise we would break determinism. However as those + * events are tied to the number of executed instructions we won't see + * them occurring every time we single step. + */ + if (replay_mode != REPLAY_MODE_NONE) { + return SSTEP_ENABLE; + } else { + return SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER; + } +} + static void tcg_accel_class_init(ObjectClass *oc, void *data) { AccelClass *ac = ACCEL_CLASS(oc); ac->name = "tcg"; ac->init_machine = tcg_init_machine; ac->allowed = &tcg_allowed; + ac->gdbstub_supported_sstep_flags = tcg_gdbstub_supported_sstep_flags; object_class_property_add_str(oc, "thread", tcg_get_thread, diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index 7d8fe475b3..a0755e6505 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -383,27 +383,13 @@ static void init_gdbserver_state(void) gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4); /* - * In replay mode all events will come from the log and can't be - * suppressed otherwise we would break determinism. However as those - * events are tied to the number of executed instructions we won't see - * them occurring every time we single step. - */ - if (replay_mode != REPLAY_MODE_NONE) { - gdbserver_state.supported_sstep_flags = SSTEP_ENABLE; - } else if (kvm_enabled()) { - gdbserver_state.supported_sstep_flags = kvm_get_supported_sstep_flags(); - } else { - gdbserver_state.supported_sstep_flags = - SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER; - } - - /* - * By default use no IRQs and no timers while single stepping so as to - * make single stepping like an ICE HW step. + * What single-step modes are supported is accelerator dependent. + * By default try to use no IRQs and no timers while single + * stepping so as to make single stepping like a typical ICE HW step. */ + gdbserver_state.supported_sstep_flags = accel_supported_gdbstub_sstep_flags(); gdbserver_state.sstep_flags = SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER; gdbserver_state.sstep_flags &= gdbserver_state.supported_sstep_flags; - } #ifndef CONFIG_USER_ONLY -- 2.34.1