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 6892BC4332F for ; Tue, 31 Oct 2023 02:29:01 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=RGYc8mFN; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4SKDbc0bs9z3cDk for ; Tue, 31 Oct 2023 13:29:00 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=RGYc8mFN; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=intel.com (client-ip=134.134.136.126; helo=mgamail.intel.com; envelope-from=xiaoyao.li@intel.com; receiver=lists.ozlabs.org) Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4SKDZg6T5xz2yV3 for ; Tue, 31 Oct 2023 13:28:11 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698719292; x=1730255292; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=vr6E776DqFsISXT/abuJv1DHpqFpjFuaZ5JfgggngVk=; b=RGYc8mFN2GRbFLyFgJdvcevMDoQLRMGAxS2t6ZLo+fw4VmOEVZpVMi9S /AupNNn38S5evhT2Sc3ZuI89HJA9s0mgP6CU4wP/D+CBOoM7vuTuGIetp OQS7HuDofBhZnqHKPjDpgxoQxz8K7wklYKRZL/3HBanjNWvY0p9Ri2vq/ ymz8DkZ7QnrwOwhbNgVQNuhG0g/GZlgXutkyEWuT7xVtr5e8VOqXURqES i7p+cJuu/ostX2Y9cpSdyJ6v7M7vmCr0AfIIBBorJPnh/mQpT8u1tKKnd Kx3oHa8Pk3K4d2Z0zDFvJ+p80jRavhzCmbXyr8WW6ozbBcnNOKWitA22z Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10879"; a="373249923" X-IronPort-AV: E=Sophos;i="6.03,264,1694761200"; d="scan'208";a="373249923" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Oct 2023 19:28:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,264,1694761200"; d="scan'208";a="8161979" Received: from xiaoyaol-hp-g830.ccr.corp.intel.com (HELO [10.93.9.145]) ([10.93.9.145]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Oct 2023 19:27:57 -0700 Message-ID: Date: Tue, 31 Oct 2023 10:27:56 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 16/35] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory Content-Language: en-US To: Sean Christopherson , Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton References: <20231027182217.3615211-1-seanjc@google.com> <20231027182217.3615211-17-seanjc@google.com> From: Xiaoyao Li In-Reply-To: <20231027182217.3615211-17-seanjc@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chao Peng , linux-riscv@lists.infradead.org, Isaku Yamahata , Wang , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Maciej Szmigiero , Michael Roth , Ackerley Tng , David Matlack , Vlastimil Babka , =?UTF-8?B?TWlja2HDq2wgU2FsYcO8?= =?UTF-8?Q?n?= , Isaku Yamahata , Quentin Perret , kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, Jarkko Sakkinen , Yu Zhang , "Kirill A . Shutemov" , kvm-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, Liam Merwick , Vishal Annapurve , l inuxppc-dev@lists.ozlabs.org, Xu Yilun , Anish Moorthy Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/28/2023 2:21 AM, Sean Christopherson wrote: ... > +KVM_SET_USER_MEMORY_REGION2 is an extension to KVM_SET_USER_MEMORY_REGION that > +allows mapping guest_memfd memory into a guest. All fields shared with > +KVM_SET_USER_MEMORY_REGION identically. Userspace can set KVM_MEM_PRIVATE in > +flags to have KVM bind the memory region to a given guest_memfd range of > +[guest_memfd_offset, guest_memfd_offset + memory_size]. The target guest_memfd > +must point at a file created via KVM_CREATE_GUEST_MEMFD on the current VM, and > +the target range must not be bound to any other memory region. All standard > +bounds checks apply (use common sense). > + > :: > > struct kvm_userspace_memory_region2 { > @@ -6087,9 +6096,24 @@ applied. > __u64 guest_phys_addr; > __u64 memory_size; /* bytes */ > __u64 userspace_addr; /* start of the userspace allocated memory */ > + __u64 guest_memfd_offset; missing a tab > + __u32 guest_memfd; > + __u32 pad1; > + __u64 pad2[14]; > }; >