From patchwork Fri Feb 5 07:14:15 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 8232341 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 [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id F40589F1C1 for ; Fri, 5 Feb 2016 07:20:04 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0FE932022A for ; Fri, 5 Feb 2016 07:20:04 +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 1337B200E6 for ; Fri, 5 Feb 2016 07:20:03 +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 1aRaf6-0003H3-W4; Fri, 05 Feb 2016 07:18:37 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aRady-0002Nd-UW for linux-arm-kernel@lists.infradead.org; Fri, 05 Feb 2016 07:17:33 +0000 Received: from 172.24.1.47 (EHLO szxeml426-hub.china.huawei.com) ([172.24.1.47]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DAZ26495; Fri, 05 Feb 2016 15:16:16 +0800 (CST) Received: from HGHY1Z002260041.china.huawei.com (10.177.16.142) by szxeml426-hub.china.huawei.com (10.82.67.181) with Microsoft SMTP Server id 14.3.235.1; Fri, 5 Feb 2016 15:16:07 +0800 From: Shannon Zhao To: , , Subject: [PATCH v11 20/21] KVM: ARM: Introduce per-vcpu kvm device controls Date: Fri, 5 Feb 2016 15:14:15 +0800 Message-ID: <1454656456-11640-21-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 In-Reply-To: <1454656456-11640-1-git-send-email-zhaoshenglong@huawei.com> References: <1454656456-11640-1-git-send-email-zhaoshenglong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.56B44C40.012C, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 1b860b673c46af003d7da0f0d526a958 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160204_231727_727183_456FC392 X-CRM114-Status: GOOD ( 15.69 ) X-Spam-Score: -4.7 (----) 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: wei@redhat.com, Peter Maydell , hangaohuai@huawei.com, kvm@vger.kernel.org, will.deacon@arm.com, peter.huangpeng@huawei.com, shannon.zhao@linaro.org, zhaoshenglong@huawei.com, linux-arm-kernel@lists.infradead.org, cov@codeaurora.org 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, 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 From: Shannon Zhao In some cases it needs to get/set attributes specific to a vcpu and so needs something else than ONE_REG. Let's copy the KVM_DEVICE approach, and define the respective ioctls for the vcpu file descriptor. Signed-off-by: Shannon Zhao Reviewed-by: Andrew Jones Acked-by: Peter Maydell --- CC: Peter Maydell --- Documentation/virtual/kvm/api.txt | 10 +++--- Documentation/virtual/kvm/devices/vcpu.txt | 8 +++++ arch/arm/kvm/arm.c | 55 ++++++++++++++++++++++++++++++ arch/arm64/kvm/reset.c | 1 + include/uapi/linux/kvm.h | 1 + 5 files changed, 71 insertions(+), 4 deletions(-) create mode 100644 Documentation/virtual/kvm/devices/vcpu.txt diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 9684f8d..cb2ef0b 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2507,8 +2507,9 @@ struct kvm_create_device { 4.80 KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR -Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device -Type: device ioctl, vm ioctl +Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, + KVM_CAP_VCPU_ATTRIBUTES for vcpu device +Type: device ioctl, vm ioctl, vcpu ioctl Parameters: struct kvm_device_attr Returns: 0 on success, -1 on error Errors: @@ -2533,8 +2534,9 @@ struct kvm_device_attr { 4.81 KVM_HAS_DEVICE_ATTR -Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device -Type: device ioctl, vm ioctl +Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, + KVM_CAP_VCPU_ATTRIBUTES for vcpu device +Type: device ioctl, vm ioctl, vcpu ioctl Parameters: struct kvm_device_attr Returns: 0 on success, -1 on error Errors: diff --git a/Documentation/virtual/kvm/devices/vcpu.txt b/Documentation/virtual/kvm/devices/vcpu.txt new file mode 100644 index 0000000..3cc59c5 --- /dev/null +++ b/Documentation/virtual/kvm/devices/vcpu.txt @@ -0,0 +1,8 @@ +Generic vcpu interface +==================================== + +The virtual cpu "device" also accepts the ioctls KVM_SET_DEVICE_ATTR, +KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same struct +kvm_device_attr as other devices, but targets VCPU-wide settings and controls. + +The groups and attributes per virtual cpu, if any, are architecture specific. diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index d2c2cc3..34d7395 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -826,11 +826,51 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, return 0; } +static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + break; + } + + return ret; +} + +static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + break; + } + + return ret; +} + +static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + break; + } + + return ret; +} + long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; + struct kvm_device_attr attr; switch (ioctl) { case KVM_ARM_VCPU_INIT: { @@ -873,6 +913,21 @@ long kvm_arch_vcpu_ioctl(struct file *filp, return -E2BIG; return kvm_arm_copy_reg_indices(vcpu, user_list->reg); } + case KVM_SET_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_set_attr(vcpu, &attr); + } + case KVM_GET_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_get_attr(vcpu, &attr); + } + case KVM_HAS_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_has_attr(vcpu, &attr); + } default: return -EINVAL; } diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index cf4f28a..9677bf0 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -81,6 +81,7 @@ int kvm_arch_dev_ioctl_check_extension(long ext) r = kvm_arm_support_pmu_v3(); break; case KVM_CAP_SET_GUEST_DEBUG: + case KVM_CAP_VCPU_ATTRIBUTES: r = 1; break; default: diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index dc16d30..50f44a2 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -851,6 +851,7 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_HYPERV_SYNIC 123 #define KVM_CAP_S390_RI 124 #define KVM_CAP_ARM_PMU_V3 125 +#define KVM_CAP_VCPU_ATTRIBUTES 126 #ifdef KVM_CAP_IRQ_ROUTING