From patchwork Fri Aug 23 19:20:00 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoffer Dall X-Patchwork-Id: 2849014 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 8653C9F239 for ; Fri, 23 Aug 2013 19:22:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7C91E20165 for ; Fri, 23 Aug 2013 19:22:29 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 178F12015F for ; Fri, 23 Aug 2013 19:22:28 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VCwvN-0006hq-37; Fri, 23 Aug 2013 19:21:33 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VCwuz-00044C-JP; Fri, 23 Aug 2013 19:21:09 +0000 Received: from mail-pa0-f49.google.com ([209.85.220.49]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VCwue-0003yv-Px for linux-arm-kernel@lists.infradead.org; Fri, 23 Aug 2013 19:20:50 +0000 Received: by mail-pa0-f49.google.com with SMTP id ld10so1032059pab.22 for ; Fri, 23 Aug 2013 12:20:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=3C0an+GVhaoW11+b4VHHhm9eUUA3RH5f2ZiyMFqa6Fg=; b=lp5UjU1AFOvjOabWpVCME63yvOzUJxm2Gmv83HYbmXCuWllFiKX3DkE4z0Ql1yzM4q +K7JvNGcwyj9ENj5LjeO/t3g00KriMMZtBFZRMJK2dCPuUsEMdKlypg4DBR7tF4a8xg4 otAA2vRGzn7cHDPWghsKFLjayvgU0pJ4TwsokffALRoML2P9YPnwozTou+KwAYh/iXhP QS4uG/73pq42ZKVhTZQv1QCM02//GaWzkM9MtjwGHOwVt3CQ0k2xW3lKrbI8R2QnGO3e DVttypkBocgcJ9sh5RIhQtGcHf5yuMMupfxMFizgyl27DbC71zfyw/ZjxsDT+Re/f1MQ z9+g== X-Gm-Message-State: ALoCoQlbU8VSV9T3W+HhJE2EfglVIMKMy2tqZBAAO50SFoev1JXjNuG2IRCSjW5/NeFalBSahd5n X-Received: by 10.67.23.227 with SMTP id id3mr572927pad.101.1377285625418; Fri, 23 Aug 2013 12:20:25 -0700 (PDT) Received: from localhost.localdomain (c-67-169-183-77.hsd1.ca.comcast.net. [67.169.183.77]) by mx.google.com with ESMTPSA id qf7sm2746078pac.14.1969.12.31.16.00.00 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 23 Aug 2013 12:20:24 -0700 (PDT) From: Christoffer Dall To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 2/8] KVM: arm-vgic: Support KVM_CREATE_DEVICE for VGIC Date: Fri, 23 Aug 2013 12:20:00 -0700 Message-Id: <1377285606-15692-3-git-send-email-christoffer.dall@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1377285606-15692-1-git-send-email-christoffer.dall@linaro.org> References: <1377285606-15692-1-git-send-email-christoffer.dall@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130823_152049_055313_11297303 X-CRM114-Status: GOOD ( 17.19 ) X-Spam-Score: -0.1 (/) Cc: Christoffer Dall , linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, patches@linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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=-4.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, SUSPICIOUS_RECIPS, 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 Support creating the ARM VGIC device through the KVM_CREATE_DEVICE ioctl, which can then later be leveraged to use the KVM_{GET/SET}_DEVICE_ATTR, which is useful both for setting addresses in a more generic API than the ARM-specific one and is useful for save/restore of VGIC state. Adds KVM_CAP_DEVICE_CTRL to ARM capabilities. Note that we change the check for creating a VGIC from bailing out if any VCPUs were created to bailing if any VCPUs were ever run. This is an important distinction that doesn't break anything, but allows creating the VGIC after the VCPUs have been created. Signed-off-by: Christoffer Dall --- Documentation/virtual/kvm/devices/arm-vgic.txt | 10 ++++++ arch/arm/include/uapi/asm/kvm.h | 1 - arch/arm/kvm/arm.c | 1 + include/linux/kvm_host.h | 1 + include/uapi/linux/kvm.h | 1 + virt/kvm/arm/vgic.c | 46 ++++++++++++++++++++++-- virt/kvm/kvm_main.c | 5 +++ 7 files changed, 62 insertions(+), 3 deletions(-) create mode 100644 Documentation/virtual/kvm/devices/arm-vgic.txt diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt new file mode 100644 index 0000000..38f27f7 --- /dev/null +++ b/Documentation/virtual/kvm/devices/arm-vgic.txt @@ -0,0 +1,10 @@ +ARM Virtual Generic Interrupt Controller (VGIC) +=============================================== + +Device types supported: + KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0 + +Only one VGIC instance may be instantiated through either this API or the +legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt +controller, requiring emulated user-space devices to inject interrupts to the +VGIC instead of directly to CPUs. diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index c1ee007..1c85102 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -142,7 +142,6 @@ struct kvm_arch_memory_slot { #define KVM_REG_ARM_VFP_FPINST 0x1009 #define KVM_REG_ARM_VFP_FPINST2 0x100A - /* KVM_IRQ_LINE irq field index values */ #define KVM_ARM_IRQ_TYPE_SHIFT 24 #define KVM_ARM_IRQ_TYPE_MASK 0xff diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 9358050..c7b7474 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -187,6 +187,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_IRQCHIP: r = vgic_present; break; + case KVM_CAP_DEVICE_CTRL: case KVM_CAP_USER_MEMORY: case KVM_CAP_SYNC_MMU: case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a63d83e..618fc4e 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1052,6 +1052,7 @@ struct kvm_device *kvm_device_from_filp(struct file *filp); extern struct kvm_device_ops kvm_mpic_ops; extern struct kvm_device_ops kvm_xics_ops; +extern struct kvm_device_ops kvm_arm_vgic_ops; #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index acccd08..ecda3aa 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -842,6 +842,7 @@ struct kvm_device_attr { #define KVM_DEV_TYPE_FSL_MPIC_20 1 #define KVM_DEV_TYPE_FSL_MPIC_42 2 #define KVM_DEV_TYPE_XICS 3 +#define KVM_DEV_TYPE_ARM_VGIC_V2 4 /* * ioctls for VM fds diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 7355f30..140608a 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -1436,15 +1436,23 @@ out: int kvm_vgic_create(struct kvm *kvm) { - int ret = 0; + int i, ret = 0; + struct kvm_vcpu *vcpu; mutex_lock(&kvm->lock); - if (atomic_read(&kvm->online_vcpus) || kvm->arch.vgic.vctrl_base) { + if (kvm->arch.vgic.vctrl_base) { ret = -EEXIST; goto out; } + kvm_for_each_vcpu(i, vcpu, kvm) { + if (vcpu->arch.has_run_once) { + ret = -EBUSY; + goto out; + } + } + spin_lock_init(&kvm->arch.vgic.lock); kvm->arch.vgic.vctrl_base = vgic_vctrl_base; kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF; @@ -1513,3 +1521,37 @@ int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr) mutex_unlock(&kvm->lock); return r; } + +static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + return -ENXIO; +} + +static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + return -ENXIO; +} + +static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + return -ENXIO; +} + +static void vgic_destroy(struct kvm_device *dev) +{ + kfree(dev); +} + +static int vgic_create(struct kvm_device *dev, u32 type) +{ + return kvm_vgic_create(dev->kvm); +} + +struct kvm_device_ops kvm_arm_vgic_ops = { + .name = "kvm-arm-vgic", + .create = vgic_create, + .destroy = vgic_destroy, + .set_attr = vgic_set_attr, + .get_attr = vgic_get_attr, + .has_attr = vgic_has_attr, +}; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 1580dd4..ec88c79 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2282,6 +2282,11 @@ static int kvm_ioctl_create_device(struct kvm *kvm, ops = &kvm_xics_ops; break; #endif +#ifdef CONFIG_KVM_ARM_VGIC + case KVM_DEV_TYPE_ARM_VGIC_V2: + ops = &kvm_arm_vgic_ops; + break; +#endif default: return -ENODEV; }