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Mon, 6 Oct 2025 11:57:38 +0200 (CEST) Received: (qmail 18656 invoked by uid 990); 6 Oct 2025 09:57:38 -0000 Received: from unknown (HELO unkown) (::1) by skiff.uberspace.de (Haraka/3.0.1) with ESMTPSA; Mon, 06 Oct 2025 11:57:37 +0200 Authentication-Results: skiff.uberspace.de; auth=pass (plain) From: Julian Ganz To: qemu-devel@nongnu.org Cc: Julian Ganz , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Mahmoud Mandour , Pierrick Bouvier Subject: [PATCH v7 03/25] plugins: add hooks for new discontinuity related callbacks Date: Mon, 6 Oct 2025 11:56:58 +0200 Message-ID: X-Mailer: git-send-email 2.49.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Bar: ---- X-Rspamd-Report: REPLY(-4) SUSPICIOUS_RECIPS(1.5) MID_CONTAINS_FROM(1) MIME_GOOD(-0.1) BAYES_HAM(-2.999999) R_MISSING_CHARSET(0.5) X-Rspamd-Score: -4.099999 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=nut.email; s=uberspace; h=from:to:cc:subject:date; bh=ZSHCzgddnSxTNbITRzGkKXj5uD5IHXB/jqzWZ1YJNrs=; 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helo=mailgate01.uberspace.is X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @nut.email) X-ZM-MESSAGEID: 1759744705365116600 Content-Type: text/plain; charset="utf-8" The plugin API allows registration of callbacks for a variety of VCPU related events, such as VCPU reset, idle and resume. In addition, we recently introduced API for registering callbacks for discontinuity events, specifically for interrupts, exceptions and host calls. This change introduces the corresponding hooks called from target specific code inside qemu. Signed-off-by: Julian Ganz --- include/qemu/plugin.h | 12 ++++++++++++ plugins/core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 54 insertions(+) diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index 8cf20cd96f..cea0a68858 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -161,6 +161,9 @@ void qemu_plugin_vcpu_exit_hook(CPUState *cpu); void qemu_plugin_tb_trans_cb(CPUState *cpu, struct qemu_plugin_tb *tb); void qemu_plugin_vcpu_idle_cb(CPUState *cpu); void qemu_plugin_vcpu_resume_cb(CPUState *cpu); +void qemu_plugin_vcpu_interrupt_cb(CPUState *cpu, uint64_t from); +void qemu_plugin_vcpu_exception_cb(CPUState *cpu, uint64_t from); +void qemu_plugin_vcpu_hostcall_cb(CPUState *cpu, uint64_t from); void qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1, uint64_t a2, uint64_t a3, uint64_t a4, uint64_t a= 5, @@ -258,6 +261,15 @@ static inline void qemu_plugin_vcpu_idle_cb(CPUState *= cpu) static inline void qemu_plugin_vcpu_resume_cb(CPUState *cpu) { } =20 +static inline void qemu_plugin_vcpu_interrupt_cb(CPUState *cpu, uint64_t f= rom) +{ } + +static inline void qemu_plugin_vcpu_exception_cb(CPUState *cpu, uint64_t f= rom) +{ } + +static inline void qemu_plugin_vcpu_hostcall_cb(CPUState *cpu, uint64_t fr= om) +{ } + static inline void qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1, uint64_t= a2, uint64_t a3, uint64_t a4, uint64_t a5, uint64_t a= 6, diff --git a/plugins/core.c b/plugins/core.c index 40d001d39a..35a252d272 100644 --- a/plugins/core.c +++ b/plugins/core.c @@ -105,6 +105,30 @@ static void plugin_vcpu_cb__simple(CPUState *cpu, enum= qemu_plugin_event ev) } } =20 +/* + * Disable CFI checks. + * The callback function has been loaded from an external library so we do= not + * have type information + */ +QEMU_DISABLE_CFI +static void plugin_vcpu_cb__discon(CPUState *cpu, + enum qemu_plugin_event ev, + enum qemu_plugin_discon_type type, + uint64_t from) +{ + struct qemu_plugin_cb *cb, *next; + uint64_t to =3D cpu->cc->get_pc(cpu); + + if (cpu->cpu_index < plugin.num_vcpus) { + /* iterate safely; plugins might uninstall themselves at any time = */ + QLIST_FOREACH_SAFE_RCU(cb, &plugin.cb_lists[ev], entry, next) { + qemu_plugin_vcpu_discon_cb_t func =3D cb->f.vcpu_discon; + + func(cb->ctx->id, cpu->cpu_index, type, from, to); + } + } +} + /* * Disable CFI checks. * The callback function has been loaded from an external library so we do= not @@ -557,6 +581,24 @@ void qemu_plugin_vcpu_resume_cb(CPUState *cpu) } } =20 +void qemu_plugin_vcpu_interrupt_cb(CPUState *cpu, uint64_t from) +{ + plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_INTERRUPT, + QEMU_PLUGIN_DISCON_INTERRUPT, from); +} + +void qemu_plugin_vcpu_exception_cb(CPUState *cpu, uint64_t from) +{ + plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_EXCEPTION, + QEMU_PLUGIN_DISCON_EXCEPTION, from); +} + +void qemu_plugin_vcpu_hostcall_cb(CPUState *cpu, uint64_t from) +{ + plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_HOSTCALL, + QEMU_PLUGIN_DISCON_HOSTCALL, from); +} + void qemu_plugin_register_vcpu_idle_cb(qemu_plugin_id_t id, qemu_plugin_vcpu_simple_cb_t cb) { --=20 2.49.1