From patchwork Fri Sep 25 21:41:17 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 7268211 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9F0A0BEEC1 for ; Fri, 25 Sep 2015 21:45:01 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BC2662096A for ; Fri, 25 Sep 2015 21:45:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DD9F9208E1 for ; Fri, 25 Sep 2015 21:44:59 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zfam8-0006TH-FK; Fri, 25 Sep 2015 21:43:28 +0000 Received: from mail-pa0-f42.google.com ([209.85.220.42]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zfald-0005wJ-Me for linux-arm-kernel@lists.infradead.org; Fri, 25 Sep 2015 21:42:58 +0000 Received: by pablk4 with SMTP id lk4so19530600pab.3 for ; Fri, 25 Sep 2015 14:42:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=PxZ5kXQnP0mBrypvn41KSM5Ofu2PFRMhMEBB98Tay6Q=; b=gMg2Lv4Z0G65u4zjEP2d0y3RPWO9mkqskajnr5pjPlSiuAYrXQfo+U95WAfNO+OWaY t6AngvyAI6+PFsM/TSDPUf8OckOClFwIvmVnzwAxfSZXera0F0f1e+5MOY3DDSNUUF3N XWJR8QM5KAkOUpPqvd+uhVToLSNjp5OdzyKvIlmXxn7QWzgIhAG+0W8ppUb0Cjd4jIi8 s5aHjFCgepnH2RaajpXyKc83EgOMn7QgZG3RcZUYuUipdVvNJDN/YDC1WrYqjyiQHc1n flzAuA4oNNSCDK2dLgqDf7MHMYPu28hsK5+tyC4u7nxVED4xQXuBOb5sHyoyslWYKU6P Ngzg== X-Gm-Message-State: ALoCoQmSbei5fXxTSFvieGSG0dfRgzj0Rzg7/zWOj38T53Wp7SNfkfi4qFQpVcsYilDgaW3+6rqn X-Received: by 10.68.184.5 with SMTP id eq5mr10221366pbc.130.1443217356349; Fri, 25 Sep 2015 14:42:36 -0700 (PDT) Received: from gnx2579.st.com. ([70.35.39.2]) by smtp.gmail.com with ESMTPSA id u1sm5606756pbz.56.2015.09.25.14.42.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 25 Sep 2015 14:42:35 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, drjones@redhat.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v3 4/4] KVM: arm/arm64: implement kvm_arm_[halt, resume]_guest Date: Fri, 25 Sep 2015 23:41:17 +0200 Message-Id: <1443217277-13173-5-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1443217277-13173-1-git-send-email-eric.auger@linaro.org> References: <1443217277-13173-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150925_144257_873614_FD12AAF0 X-CRM114-Status: GOOD ( 15.56 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, patches@linaro.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We introduce kvm_arm_halt_guest and resume functions. They will be used for IRQ forward state change. Halt is synchronous and prevents the guest from being re-entered. We use the same mechanism put in place for PSCI former pause, now renamed power_off. A new flag is introduced in arch vcpu state, pause, only meant to be used by those functions. Signed-off-by: Eric Auger Reviewed-by: Christoffer Dall --- v2 -> v3: - change the comment associated to the pause flag into: Don't run the guest (internal implementation need) - add Christoffer's R-b v1 -> v2: - check pause in kvm_arch_vcpu_runnable - we cannot use kvm_vcpu_block since this latter would exit on IRQ/FIQ and this is not what we want --- arch/arm/include/asm/kvm_host.h | 3 +++ arch/arm/kvm/arm.c | 35 +++++++++++++++++++++++++++++++---- arch/arm64/include/asm/kvm_host.h | 3 +++ 3 files changed, 37 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 1931a25..efbb812 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -128,6 +128,9 @@ struct kvm_vcpu_arch { /* vcpu power-off state */ bool power_off; + /* Don't run the guest (internal implementation need) */ + bool pause; + /* IO related fields */ struct kvm_decode mmio_decode; diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 4eb59e3..0308092 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -353,7 +353,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) { return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) - && !v->arch.power_off); + && !v->arch.power_off && !v->arch.pause); } /* Just ensure a guest exit from a particular CPU */ @@ -479,11 +479,38 @@ bool kvm_arch_intc_initialized(struct kvm *kvm) return vgic_initialized(kvm); } +static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused; +static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused; + +static void kvm_arm_halt_guest(struct kvm *kvm) +{ + int i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) + vcpu->arch.pause = true; + force_vm_exit(cpu_all_mask); +} + +static void kvm_arm_resume_guest(struct kvm *kvm) +{ + int i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) { + wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); + + vcpu->arch.pause = false; + wake_up_interruptible(wq); + } +} + static void vcpu_sleep(struct kvm_vcpu *vcpu) { wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); - wait_event_interruptible(*wq, !vcpu->arch.power_off); + wait_event_interruptible(*wq, ((!vcpu->arch.power_off) && + (!vcpu->arch.pause))); } static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) @@ -533,7 +560,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) update_vttbr(vcpu->kvm); - if (vcpu->arch.power_off) + if (vcpu->arch.power_off || vcpu->arch.pause) vcpu_sleep(vcpu); /* @@ -561,7 +588,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) } if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || - vcpu->arch.power_off) { + vcpu->arch.power_off || vcpu->arch.pause) { local_irq_enable(); kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index d89ec1b..d19dfd6 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -151,6 +151,9 @@ struct kvm_vcpu_arch { /* vcpu power-off state */ bool power_off; + /* Don't run the guest (internal implementation need) */ + bool pause; + /* IO related fields */ struct kvm_decode mmio_decode;