From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3D10B46A5F2; Wed, 5 Aug 2026 11:04:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785927854; cv=none; b=T3+G3A6OyO70hLfTHjf7cv+zq692Pt/S3Efnwsn3aVBOOIM2hY6+IDRf/25FQc9bp9HAR8V5vd9I3tdTsRgWkjFXxbRlPA4BZE4jm6uhchLc6agh9QNxoN7PKxCpaWP3zrGZ2b7lPGWEo5gKmTzgYzLOgIrXdJJ7hUfYl79Q0r8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785927854; c=relaxed/simple; bh=CMtQOBxsOyZafsRq9Hm/+RIAhu7pzUJUx0wZ70Pn+qA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=anso/W7X+S+jIrGR7EgxoSdpASDlfXkm5cB1OoaE4283rDLu3ayBe2XHuexuVrDIXUdngde2/ILdZEUiR01ycnJZhXTRwkRmYfe5sMlqcgUIm9ICNdAdNKT01/3PYUXsUTXQ17qoUe4BXkEAXAMI/0s3LdhWbjbzNNtex6gqJzs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=ptqwnP4n; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="ptqwnP4n" Received: from fedora.hsd1.wa.comcast.net (unknown [52.148.140.42]) by linux.microsoft.com (Postfix) with ESMTPSA id 703A420B716B; Wed, 5 Aug 2026 04:03:52 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 703A420B716B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1785927832; bh=sI2sXVp/yDVu/Cytrm86fNxGZAmR2vZkYQFR/0LYH8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ptqwnP4nE71RqbshWWQTSPUb724PWfo3h4jWJQ1rQmspZmSAZ54+nGmQsODPrqLn3 HGa6y//yfmt3xJoUAeSsCRDCgaxyLgfA3tmd298neLoDt56lGmEuKSV/yJuwn4Hayc ntfx8/TaAJsQHEZ8mPVOOhbSFfoWkGvTS4FOHKps= From: Sriram Nambakam To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [RFC PATCH v1 36/42] KVM: plane: handle KVM_CHECK_EXTENSION on the plane fd Date: Wed, 5 Aug 2026 04:03:18 -0700 Message-ID: <20260805110324.25067-37-snambakam@linux.microsoft.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260805110324.25067-1-snambakam@linux.microsoft.com> References: <20260805110324.25067-1-snambakam@linux.microsoft.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A plane file descriptor did not implement KVM_CHECK_EXTENSION and failed with -ENOTTY, but userspace needs to be able to query capabilities on it. Forward the query to the plane's parent VM, except for KVM_CAP_PLANES which returns 0 because a plane cannot host planes of its own. --- virt/kvm/kvm_main.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 3a1a09f26340..6e4f3f3e6881 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4946,12 +4946,21 @@ static long kvm_vcpu_compat_ioctl(struct file *filp, } #endif +static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg); + static long __kvm_plane_ioctl(struct kvm_plane *plane, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; long r; switch (ioctl) { + case KVM_CHECK_EXTENSION: + /* A plane cannot host planes of its own. */ + if (arg == KVM_CAP_PLANES) + r = 0; + else + r = kvm_vm_ioctl_check_extension_generic(plane->kvm, arg); + break; case KVM_CREATE_VCPU: r = kvm_plane_ioctl_create_vcpu(plane, arg); break; -- 2.55.0