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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 73517CD98C6 for ; Mon, 8 Jun 2026 14:43:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=r3zr3Gh04lmdQvSFvLsJJiKsg8nI8W8TqIeOiByE9SQ=; b=cl/A5uL8z9bNIZ IG+JwAaopKKvC6EAtp5QN1eJ0HkDY/FvfR+iZBFmvbdWO4QPZyRBwpZNS/8igoV/uznwV/br/NLLH a74ZzyYuf184exXmjAUwF8nFQ3Bntk/tdpObEXWD68R0IfYJY76j+zqVFWKrF1KI9eV9YcYKsAhzr eRrdir3YFXdNZaYNhKGLt0lSKsTf6cwTZBn5lSBNIFzYDZDUYjqtM6RcSKeWX1Y4UIUMUoqJZC0Vm R2TLyLsyEMM2ndCCt9Pe6NR6g4cgpt2yhHJ7DbiPf3G+0aLDF/SkxYkEfv/UwmFKY5rDt366R9yc2 +bdpWGviXihARKD5HTJA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wWbCI-00000003pxK-49fP; Mon, 08 Jun 2026 14:43:26 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wWbCD-00000003pk4-30EO for kvm-riscv@bombadil.infradead.org; Mon, 08 Jun 2026 14:43:21 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=sm5Nes0CBHSHzrIXDQYXiFAfxGVdcZUPLZZ4Ymn3KuQ=; b=FiDCEaC+sR5ln2cBDFSXi7PP/b aAkwrWaa8o2jlPKTO4zeXCeFRB6SZ3Jcwu5/UEhp2tiL4RAGMBO1585wsFbHkivpVUKX+kfEt2L+q FSE/Db4AnJF6uel/XRKnSsbhNVQWCkf1UnqAHPbCBByaUo8f83p5MDHuabRQ/swzCjzjr93ISO8/u uZ9S2di0ExIlK46EizEawZjw4u8stlMDCxYf6G6qgkriNbXZL3nSZlloF2PIX0aohQfmmAWtPMYzH ULMKQdbMhJhYU3aoYlz7WSH+xy0fLS5xw3KHhpZVcN1UJmINF4apdXMzl8RWfPsum1qx2rKK6sy10 VdjMp2ug==; Received: from mail.8bytes.org ([2a01:238:42d9:3f00:e505:6202:4f0c:f051]) by desiato.infradead.org with esmtp (Exim 4.99.2 #2 (Red Hat Linux)) id 1wWbC8-000000019AQ-1qcf for kvm-riscv@lists.infradead.org; Mon, 08 Jun 2026 14:43:20 +0000 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> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260608_154316_873416_C9B410A2 X-CRM114-Status: GOOD ( 13.91 ) X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org 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 -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv