From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ADEB5CD8C92 for ; Mon, 8 Jun 2026 14:54:13 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gYw4Z6r9cz3cY7; Tue, 09 Jun 2026 00:52:30 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2a01:238:42d9:3f00:e505:6202:4f0c:f051" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1780930350; cv=none; b=R0yvdeWmx6QS+H/FvLsiSssGc4iHLhDl6gG+wWpCHtG8oPlW+ogVIZIlVXs/9pzplxmnqgVmBqSyV/xfODlnOrPeeygFP3spPdk8kPAR2G7yRTL4Re+C0EZ9BW9CtaaDLWRzXtqus+iyPyPHCPNyIF7M69lN5zO4lUKBoFYmlY7J+VaQjLksBOQQR2rFQOTBBLJ1yRLEQvoV/7LgY+T+Te3yGZNqx4uCNvgksjNQpo8Q27pj5s20ChyLi9vTiaxLD4z+ISCxfPDQk3MRXabVgBmgv7H6GDnLn/epS7/OEbZ2xjhkgrc1SW5TPI0P7knubYQZtu61D0KkDvgap0A1Ag== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1780930350; c=relaxed/relaxed; bh=sm5Nes0CBHSHzrIXDQYXiFAfxGVdcZUPLZZ4Ymn3KuQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cxNzTVKb0l4x/f/8VPDxDh6JIOBEiG835pLYl3RqN5gfwtWzh1O/WOI6j02S8jBtneHh6aQYnDnLkvWbH4QqPShmxx7lBlg+iuCEuLm51zxmrRVLmDb640Z2QHTqcADH9OTW+HstBE2sFqhinfWvLNuiXtDXGZEdP6eTPTrtchK1UR4g6UHWpRUvKekCkIcx/q+20GL9wOBH9K5Of+fmAH/F0l4E3RKhspxF4MSTJD3SeDsLQmpm7yc7oxsQlDt4HHJmurgPDt3ivmySiVqYYieEsk4piIRUfkhneJl5kPWnESePpRhWTZwhXa34jISs97gV6V5Se8N/1olieqUgNw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=8bytes.org; spf=pass (client-ip=2a01:238:42d9:3f00:e505:6202:4f0c:f051; helo=mail.8bytes.org; envelope-from=joro@8bytes.org; receiver=lists.ozlabs.org) smtp.mailfrom=8bytes.org Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=8bytes.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=8bytes.org (client-ip=2a01:238:42d9:3f00:e505:6202:4f0c:f051; helo=mail.8bytes.org; envelope-from=joro@8bytes.org; receiver=lists.ozlabs.org) Received: from mail.8bytes.org (mail.8bytes.org [IPv6:2a01:238:42d9:3f00:e505:6202:4f0c:f051]) by lists.ozlabs.org (Postfix) with ESMTP id 4gYw4P6g55z3c2l for ; Tue, 09 Jun 2026 00:52:21 +1000 (AEST) Received: from io.home.8bytes.org (p4ffe1d30.dip0.t-ipconnect.de [79.254.29.48]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.8bytes.org (Postfix) with ESMTPSA id 4CB882028C0; Mon, 8 Jun 2026 16:43:11 +0200 (CEST) From: =?UTF-8?q?J=C3=B6rg=20R=C3=B6del?= To: Paolo Bonzini , Sean Christopherson Cc: Tom Lendacky , ashish.kalra@amd.com, michael.roth@amd.com, nsaenz@amazon.com, anelkz@amazon.de, James.Bottomley@HansenPartnership.com, Melody Wang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, x86@kernel.org, coconut-svsm@lists.linux.dev, joerg.roedel@amd.com Subject: [PATCH 29/60] kvm: Implement KVM_CREATE_PLANE ioctl Date: Mon, 8 Jun 2026 16:42:21 +0200 Message-ID: <20260608144252.351443-30-joro@8bytes.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260608144252.351443-1-joro@8bytes.org> References: <20260608144252.351443-1-joro@8bytes.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Paolo Bonzini Add a new VM ioctl to create a new plane. It returns a new file descriptor which supports per-plane ioctls. Signed-off-by: Paolo Bonzini Co-developed-by: Joerg Roedel Signed-off-by: Joerg Roedel --- include/uapi/linux/kvm.h | 2 ++ virt/kvm/kvm_main.c | 75 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 77 insertions(+) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 813f964a6dc1..24e34b8e4819 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1355,6 +1355,8 @@ struct kvm_s390_keyop { #define KVM_GET_DEVICE_ATTR _IOW(KVMIO, 0xe2, struct kvm_device_attr) #define KVM_HAS_DEVICE_ATTR _IOW(KVMIO, 0xe3, struct kvm_device_attr) +#define KVM_CREATE_PLANE _IO(KVMIO, 0xe4) + /* * ioctls for vcpu fds */ diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 5a0277e2ac7c..03a44ff62f0f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4843,6 +4843,34 @@ static long kvm_vcpu_compat_ioctl(struct file *filp, } #endif +static long kvm_plane_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + struct kvm_plane *plane = filp->private_data; + + if (plane->kvm->mm != current->mm || plane->kvm->vm_dead) + return -EIO; + + switch (ioctl) { + default: + return -ENOTTY; + } +} + +static int kvm_plane_release(struct inode *inode, struct file *filp) +{ + struct kvm_plane *plane = filp->private_data; + + kvm_put_kvm(plane->kvm); + return 0; +} + +static struct file_operations kvm_plane_fops = { + .unlocked_ioctl = kvm_plane_ioctl, + .release = kvm_plane_release, + KVM_COMPAT(kvm_plane_ioctl), +}; + static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma) { struct kvm_device *dev = filp->private_data; @@ -5288,6 +5316,49 @@ static int kvm_vm_ioctl_get_stats_fd(struct kvm *kvm) return fd; } +static int kvm_vm_ioctl_create_plane(struct kvm *kvm, unsigned id) +{ + struct kvm_plane *plane; + struct file *file; + int r, fd; + + if (id >= kvm_arch_max_planes(kvm) || + WARN_ON_ONCE(id >= KVM_MAX_PLANES)) + return -EINVAL; + + guard(mutex)(&kvm->lock); + if (kvm->planes[id]) + return -EEXIST; + + fd = get_unused_fd_flags(O_CLOEXEC); + if (fd < 0) + return fd; + + plane = kvm_create_plane(kvm, id); + if (!plane) { + r = -ENOMEM; + goto put_fd; + } + + kvm_get_kvm(kvm); + file = anon_inode_getfile("kvm-plane", &kvm_plane_fops, plane, O_RDWR); + if (IS_ERR(file)) { + r = PTR_ERR(file); + goto put_kvm; + } + + fd_install(fd, file); + return fd; + +put_kvm: + kvm_put_kvm(kvm); + kvm_destroy_one_plane(plane); +put_fd: + put_unused_fd(fd); + return r; +} + + #define SANITY_CHECK_MEM_REGION_FIELD(field) \ do { \ BUILD_BUG_ON(offsetof(struct kvm_userspace_memory_region, field) != \ @@ -5306,6 +5377,9 @@ static long kvm_vm_ioctl(struct file *filp, if (kvm->mm != current->mm || kvm->vm_dead) return -EIO; switch (ioctl) { + case KVM_CREATE_PLANE: + r = kvm_vm_ioctl_create_plane(kvm, arg); + break; case KVM_CREATE_VCPU: r = kvm_vm_ioctl_create_vcpu(kvm, arg); break; @@ -6676,6 +6750,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module) kvm_chardev_ops.owner = module; kvm_vm_fops.owner = module; kvm_vcpu_fops.owner = module; + kvm_plane_fops.owner = module; kvm_device_fops.owner = module; kvm_preempt_ops.sched_in = kvm_sched_in; -- 2.53.0