From nobody Mon Feb 9 20:31:24 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1607608265; cv=none; d=zohomail.com; s=zohoarc; b=WMovV5kbohB3jbqfbv1Ovm+3ly5UFxGm+KJbsdYYFsteHwpu89fer5ot/UvKmPPwTg7Kumro3ecD76xPf+37X4hrk2tYh1nRvRb57zh0EmD6HZo8iYSGr0lU/9/oe5pb8peVzVN48B5r3T+R4KnJNEnUpuCkKS2QwvRzYZJGBcs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1607608265; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=+4aOWqFxgg7aATfssxhkAYsZ5VQo+4/kUYNPhwGwoo0=; b=IrN0nP3304/BBjbJzdnF5PKQKa26scEeZqht0lzI0ams1ZDRO4sbUm6bJq537e0VhxQ2bNsDJ/5wqCESypcbGqZxoWrdBmSy3CzA4xlJxAFCyO2Yt1MxVjpqwN4lTH0JTqPBbB7XzsMTSwOnSnN+mi5dtDtQuQ4A1lHIbIvV+JE= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1607608265202136.5473717020626; Thu, 10 Dec 2020 05:51:05 -0800 (PST) Received: from localhost ([::1]:39574 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1knLkh-0002YV-ED for importer@patchew.org; Thu, 10 Dec 2020 08:12:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56674) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1knKol-0002ZR-Fe for qemu-devel@nongnu.org; Thu, 10 Dec 2020 07:13:09 -0500 Received: from mx2.suse.de ([195.135.220.15]:47830) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1knKoi-0006Wp-M5 for qemu-devel@nongnu.org; Thu, 10 Dec 2020 07:13:07 -0500 Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E4448AD57; Thu, 10 Dec 2020 12:12:51 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de From: Claudio Fontana To: Paolo Bonzini , Thomas Huth , Richard Henderson , Stefano Stabellini , Wenchao Wang , Roman Bolshakov , Sunil Muthuswamy , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v10 22/32] target/arm: do not use cc->do_interrupt for KVM directly Date: Thu, 10 Dec 2020 13:12:16 +0100 Message-Id: <20201210121226.19822-23-cfontana@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201210121226.19822-1-cfontana@suse.de> References: <20201210121226.19822-1-cfontana@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=195.135.220.15; envelope-from=cfontana@suse.de; helo=mx2.suse.de X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Peter Maydell , Eduardo Habkost , Paul Durrant , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Jason Wang , Marcelo Tosatti , qemu-devel@nongnu.org, Peter Xu , Dario Faggioli , Cameron Esfahani , haxm-team@intel.com, Claudio Fontana , Anthony Perard , Bruce Rogers , Olaf Hering , "Emilio G . Cota" , Colin Xu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" cc->do_interrupt is in theory a TCG callback used in accel/tcg only, to prepare the emulated architecture to take an interrupt as defined in the hardware specifications, but in reality the _do_interrupt style of functions in targets are also occasionally reused by KVM to prepare the architecture state in a similar way where userspace code has identified that it needs to deliver an exception to the guest. In the case of ARM, that includes: 1) the vcpu thread got a SIGBUS indicating a memory error, and we need to deliver a Synchronous External Abort to the guest to let it know about the error. 2) the kernel told us about a debug exception (breakpoint, watchpoint) but it is not for one of QEMU's own gdbstub breakpoints/watchpoints so it must be a breakpoint the guest itself has set up, therefore we need to deliver it to the guest. So in order to reuse code, the same arm_do_interrupt function is used. This is all fine, but we need to avoid calling it using the callback registered in CPUClass, since that one is now TCG-only. Fortunately this is easily solved by replacing calls to CPUClass::do_interrupt() with explicit calls to arm_do_interrupt(). Signed-off-by: Claudio Fontana Cc: Peter Maydell Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/arm/helper.c | 4 ++++ target/arm/kvm64.c | 6 ++---- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index 38cd35c049..bebaabf525 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -9895,6 +9895,10 @@ static void handle_semihosting(CPUState *cs) * Do any appropriate logging, handle PSCI calls, and then hand off * to the AArch64-entry or AArch32-entry function depending on the * target exception level's register width. + * + * Note: this is used for both TCG (as the do_interrupt tcg op), + * and KVM to re-inject guest debug exceptions, and to + * inject a Synchronous-External-Abort. */ void arm_cpu_do_interrupt(CPUState *cs) { diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index f74bac2457..3728b3a336 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -944,7 +944,6 @@ static void kvm_inject_arm_sea(CPUState *c) { ARMCPU *cpu =3D ARM_CPU(c); CPUARMState *env =3D &cpu->env; - CPUClass *cc =3D CPU_GET_CLASS(c); uint32_t esr; bool same_el; =20 @@ -960,7 +959,7 @@ static void kvm_inject_arm_sea(CPUState *c) =20 env->exception.syndrome =3D esr; =20 - cc->do_interrupt(c); + arm_cpu_do_interrupt(c); } =20 #define AARCH64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \ @@ -1491,7 +1490,6 @@ bool kvm_arm_handle_debug(CPUState *cs, struct kvm_de= bug_exit_arch *debug_exit) { int hsr_ec =3D syn_get_ec(debug_exit->hsr); ARMCPU *cpu =3D ARM_CPU(cs); - CPUClass *cc =3D CPU_GET_CLASS(cs); CPUARMState *env =3D &cpu->env; =20 /* Ensure PC is synchronised */ @@ -1545,7 +1543,7 @@ bool kvm_arm_handle_debug(CPUState *cs, struct kvm_de= bug_exit_arch *debug_exit) env->exception.vaddress =3D debug_exit->far; env->exception.target_el =3D 1; qemu_mutex_lock_iothread(); - cc->do_interrupt(cs); + arm_cpu_do_interrupt(cs); qemu_mutex_unlock_iothread(); =20 return false; --=20 2.26.2