From patchwork Wed May 24 20:13:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9746841 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0A57A601C2 for ; Wed, 24 May 2017 20:14:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F23372897C for ; Wed, 24 May 2017 20:14:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E6D8F28998; Wed, 24 May 2017 20:14:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 866E32897C for ; Wed, 24 May 2017 20:14:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941006AbdEXUOf (ORCPT ); Wed, 24 May 2017 16:14:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40372 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032326AbdEXUOW (ORCPT ); Wed, 24 May 2017 16:14:22 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E44355F7B6; Wed, 24 May 2017 20:14:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E44355F7B6 Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=eric.auger@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com E44355F7B6 Received: from localhost.localdomain.com (ovpn-116-222.ams2.redhat.com [10.36.116.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6CFAA5C6E3; Wed, 24 May 2017 20:14:18 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, alex.williamson@redhat.com, pbonzini@redhat.com, marc.zyngier@arm.com, christoffer.dall@linaro.org Cc: drjones@redhat.com, wei@redhat.com Subject: [PATCH 09/10] KVM: arm/arm64: vgic: Implement forwarding setting Date: Wed, 24 May 2017 22:13:22 +0200 Message-Id: <1495656803-28011-10-git-send-email-eric.auger@redhat.com> In-Reply-To: <1495656803-28011-1-git-send-email-eric.auger@redhat.com> References: <1495656803-28011-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 24 May 2017 20:14:22 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implements kvm_vgic_[set|unset]_forwarding. Handle low-level VGIC programming and consistent irqchip programming. Signed-off-by: Eric Auger --- --- include/kvm/arm_vgic.h | 5 +++ virt/kvm/arm/vgic/vgic.c | 105 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 110 insertions(+) diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 695ebc7..7ddac8a 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -343,4 +343,9 @@ int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi); */ int kvm_vgic_setup_default_irq_routing(struct kvm *kvm); +int kvm_vgic_set_forwarding(struct kvm *kvm, unsigned int irq, + unsigned int virt_irq); +void kvm_vgic_unset_forwarding(struct kvm *kvm, unsigned int irq, + unsigned int virt_irq); + #endif /* __KVM_ARM_VGIC_H */ diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index aa0618c..c2add8d 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -17,6 +17,8 @@ #include #include #include +#include +#include #include "vgic.h" @@ -771,3 +773,106 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq) return map_is_active; } +/** + * kvm_vgic_set_forwarding - Set IRQ forwarding + * + * @kvm: kvm handle + * @host_irq: the host linux IRQ + * @vintid: the virtual INTID + * + * This function must be called when the IRQ is not active: + * ie. not active at GIC level and not currently under injection + * into the guest using the unforwarded mode. The physical IRQ must + * be disabled and all vCPUs must have been exited and prevented + * from being re-entered. + */ +int kvm_vgic_set_forwarding(struct kvm *kvm, unsigned int host_irq, + unsigned int vintid) +{ + struct kvm_vcpu *vcpu; + struct vgic_irq *irq; + struct irq_desc *desc; + struct irq_data *data; + unsigned int pintid; + int ret = 0; + + + kvm_debug("%s host linux irq=%d vintid=%d\n", + __func__, host_irq, vintid); + + if (!vgic_valid_spi(kvm, vintid)) + return 0; + + /* find the INTID corresponding to @host_irq */ + desc = irq_to_desc(host_irq); + if (!desc) { + kvm_err("%s: no interrupt descriptor\n", __func__); + return -EINVAL; + } + + data = irq_desc_get_irq_data(desc); + while (data->parent_data) + data = data->parent_data; + + pintid = data->hwirq; + + irq = vgic_get_irq(kvm, NULL, vintid); + + spin_lock(&irq->irq_lock); + + vcpu = irq->target_vcpu; + + if (!vcpu) { + ret = -EAGAIN; + goto unlock; + } + + irq_set_vcpu_affinity(host_irq, vcpu); + + irq->hw = true; + irq->hwintid = pintid; + irq->host_irq = host_irq; + +unlock: + spin_unlock(&irq->irq_lock); + vgic_put_irq(kvm, irq); + return ret; +} + +/** + * kvm_vgic_unset_forwarding - Unset IRQ forwarding + * + * @kvm: KVM handle + * @host_irq: the host Linux IRQ number + * @vintid: virtual INTID + * + * This function must be called when the host irq is disabled and + * all vCPUs have been exited and prevented from being re-entered. + */ +void kvm_vgic_unset_forwarding(struct kvm *kvm, + unsigned int host_irq, + unsigned int vintid) +{ + struct vgic_irq *irq; + bool active; + + kvm_debug("%s host_irq=%d virt_irq=%d\n", __func__, host_irq, vintid); + + irq_get_irqchip_state(host_irq, IRQCHIP_STATE_ACTIVE, &active); + + irq = vgic_get_irq(kvm, NULL, vintid); + spin_lock(&irq->irq_lock); + + if (!is_unshared_mapped(irq)) + goto unlock; + + if (active) + irq_set_irqchip_state(host_irq, IRQCHIP_STATE_ACTIVE, false); + + irq->hw = false; + irq_set_vcpu_affinity(host_irq, NULL); + +unlock: + spin_unlock(&irq->irq_lock); +} +