From nobody Sat May 18 18:58:08 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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 1684781581300225.92037860512562; Mon, 22 May 2023 11:53:01 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q1Adx-00015K-NG; Mon, 22 May 2023 14:52:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q1Adv-00015C-MW for qemu-devel@nongnu.org; Mon, 22 May 2023 14:52:27 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q1Adn-0000rd-UD for qemu-devel@nongnu.org; Mon, 22 May 2023 14:52:27 -0400 Received: from 54-240-198-32.amazon.com ([54.240.198.32] helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1q1Ada-009NQL-7g; Mon, 22 May 2023 18:52:06 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=0YX3zDSAXItky6R4zqyawj5d+0MYoCfoyrFy+yhV0JY=; b=wSFV1uZ9EByJul2sFPQKxys0GE qfY6jVVb/AcLfGnlj/+1B5rdrp3d/bxyKlY1rVqlHosMu1ENhlelRLU3MELaKbvoj6wSvqZ+Gjsmg IrmF1MH8E1Ac1zc3NeY6l3OfOXL1U3lljOYZ6/SFSaP6tEsv1wwvaswxNlKsq67tHYv06UOdHUVkx ppiJs7saSpeU79h37B/X+CnpXRTNvA99Y5IVxHBoAQEVDEuqKHb9lc4qYhsX2/MFuWBuJGeCLQUlR 0Maocc5p8EhL4NgOlDqRp03JYMzZxyit7U3oaK5Ilc/kcqfkfeJmRC6jSxu+8p/KODWwtgivTV0c1 53yEtgfg==; Message-ID: Subject: [PATCH] i386/xen: consistent locking around Xen singleshot timers From: David Woodhouse To: Peter Maydell , Paolo Bonzini Cc: qemu-devel@nongnu.org, Paul Durrant Date: Mon, 22 May 2023 11:52:02 -0700 In-Reply-To: References: <20230302123029.153265-1-pbonzini@redhat.com> <20230302123029.153265-33-pbonzini@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-aP0enc3dtE7EM1L0z9Mh" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html 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: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+9e4e6d78279546726801+7211+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 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-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1684781583029100003 --=-aP0enc3dtE7EM1L0z9Mh Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Coverity points out (CID 1507534) that we sometimes access env->xen_singleshot_timer_ns under the protection of env->xen_timers_lock (eg in xen_vcpu_singleshot_timer_event()) and sometimes not (the specific case Coverity complains about is in do_vcpu_soft_reset()). This isn't strictly an issue. There are two modes for the timers; if the kernel supports the EVTCHN_SEND capability then it handles all the timer hypercalls and delivery internally, and all we need to do is an ioctl to get/set the next timer as part of the vCPU state. If the kernel doesn't have that support, then we do all the emulation within qemu, and *those* are the code paths where we actually care about the locking. But it doesn't hurt to be a little bit more consistent and avoid having to explain *why* it's OK. Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- On Tue, 2023-05-09 at 15:55 +0100, Peter Maydell wrote: > Hi; Coverity points out (CID 1507534) that we seem to sometimes > access env->xen_singleshot_timer_ns under the protection of > env->xen_timers_lock (eg in xen_vcpu_singleshot_timer_event()) > and sometimes not (the specific case Coverity complains about is > in do_vcpu_soft_reset()). Is this a false positive, or is there Thanks. As noted, I think it's harmless but it doesn't hurt to clean it up a bit. I've pushed this to my tree at https://git.infradead.org/users/dwmw2/qemu.git/shortlog/refs/heads/xenfv on top of the other fixes that didn't make 8.0. target/i386/kvm/xen-emu.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index d7c7eb8d9c..36d2dd8d02 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -43,6 +43,7 @@ =20 static void xen_vcpu_singleshot_timer_event(void *opaque); static void xen_vcpu_periodic_timer_event(void *opaque); +static int vcpuop_stop_singleshot_timer(CPUState *cs); =20 #ifdef TARGET_X86_64 #define hypercall_compat32(longmode) (!(longmode)) @@ -483,6 +484,7 @@ static int kvm_xen_set_vcpu_timer(CPUState *cs) =20 static void do_set_vcpu_timer_virq(CPUState *cs, run_on_cpu_data data) { + QEMU_LOCK_GUARD(&X86_CPU(cs)->env.xen_timers_lock); kvm_xen_set_vcpu_timer(cs); } =20 @@ -545,7 +547,6 @@ static void do_vcpu_soft_reset(CPUState *cs, run_on_cpu= _data data) env->xen_vcpu_time_info_gpa =3D INVALID_GPA; env->xen_vcpu_runstate_gpa =3D INVALID_GPA; env->xen_vcpu_callback_vector =3D 0; - env->xen_singleshot_timer_ns =3D 0; memset(env->xen_virq, 0, sizeof(env->xen_virq)); =20 set_vcpu_info(cs, INVALID_GPA); @@ -555,8 +556,13 @@ static void do_vcpu_soft_reset(CPUState *cs, run_on_cp= u_data data) INVALID_GPA); if (kvm_xen_has_cap(EVTCHN_SEND)) { kvm_xen_set_vcpu_callback_vector(cs); + + QEMU_LOCK_GUARD(&X86_CPU(cs)->env.xen_timers_lock); + env->xen_singleshot_timer_ns =3D 0; kvm_xen_set_vcpu_timer(cs); - } + } else { + vcpuop_stop_singleshot_timer(cs); + }; =20 } =20 @@ -1844,10 +1850,7 @@ int kvm_put_xen_state(CPUState *cs) } =20 if (env->xen_virq[VIRQ_TIMER]) { - ret =3D kvm_xen_set_vcpu_timer(cs); - if (ret < 0) { - return ret; - } + do_set_vcpu_timer_virq(cs, RUN_ON_CPU_HOST_INT(env->xen_virq[VIRQ_= TIMER])); } return 0; } --=20 2.34.1 --=-aP0enc3dtE7EM1L0z9Mh Content-Type: application/pkcs7-signature; name="smime.p7s" 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