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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C44EC43217 for ; Thu, 10 Mar 2022 14:10:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242858AbiCJOLu (ORCPT ); Thu, 10 Mar 2022 09:11:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242760AbiCJOL1 (ORCPT ); Thu, 10 Mar 2022 09:11:27 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C66F9A4D4; Thu, 10 Mar 2022 06:10:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646921425; x=1678457425; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=aXDmGBTRlSAIbebZ1eKgmeAE+5/9H+lFwtsMHbxfleU=; b=Z4VC3B9yaIDESl8IUUm7CWKeW5VI6Gy+C9mvHguhOTBm2d2Y6YcToDCJ ukrwNLoy9+V4A23zgQZnbKdp2JBre5P1r45C8i0nTL4AiEAnYjImlPzxF j2RZCdeatisICJLy3cpI26A4rMeQ6DwnbPiRq4mS3wGZfqYSPvC9n3+G0 yKrphlTd8LiScJNN79C1qGinNO5Vse3NVur9/27lp/O+yw82haIuLzLIX YcD+PkJhk9+p4yh97XyfxSnFoYJvJb3NjWIKgYOOTodBVUwq5t+qN0bqm 9wW0CevEEJ2BsBXsWwVT/01Lm0XhXVWIdXTk+jQUS3eWMHgHgNWk2l/bR w==; X-IronPort-AV: E=McAfee;i="6200,9189,10281"; a="252823460" X-IronPort-AV: E=Sophos;i="5.90,170,1643702400"; d="scan'208";a="252823460" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2022 06:10:24 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,170,1643702400"; d="scan'208";a="554655000" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga008.jf.intel.com with ESMTP; 10 Mar 2022 06:10:16 -0800 From: Chao Peng To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, qemu-devel@nongnu.org Cc: Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Mike Rapoport , Steven Price , "Maciej S . Szmigiero" , Vlastimil Babka , Vishal Annapurve , Yu Zhang , Chao Peng , "Kirill A . Shutemov" , luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com Subject: [PATCH v5 06/13] KVM: Use kvm_userspace_memory_region_ext Date: Thu, 10 Mar 2022 22:09:04 +0800 Message-Id: <20220310140911.50924-7-chao.p.peng@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220310140911.50924-1-chao.p.peng@linux.intel.com> References: <20220310140911.50924-1-chao.p.peng@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org Use the new extended memslot structure kvm_userspace_memory_region_ext. The extended part (private_fd/ private_offset) will be copied from userspace only when KVM_MEM_PRIVATE is set. Internally old kvm_userspace_memory_region will still be used for places where the extended fields are not needed. Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- arch/x86/kvm/x86.c | 12 ++++++------ include/linux/kvm_host.h | 4 ++-- virt/kvm/kvm_main.c | 30 ++++++++++++++++++++---------- 3 files changed, 28 insertions(+), 18 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8c06b8204fca..1d9dbef67715 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11757,13 +11757,13 @@ void __user * __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, } for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { - struct kvm_userspace_memory_region m; + struct kvm_userspace_memory_region_ext m; - m.slot = id | (i << 16); - m.flags = 0; - m.guest_phys_addr = gpa; - m.userspace_addr = hva; - m.memory_size = size; + m.region.slot = id | (i << 16); + m.region.flags = 0; + m.region.guest_phys_addr = gpa; + m.region.userspace_addr = hva; + m.region.memory_size = size; r = __kvm_set_memory_region(kvm, &m); if (r < 0) return ERR_PTR_USR(r); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3be8116079d4..c92c70174248 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1082,9 +1082,9 @@ enum kvm_mr_change { }; int kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem); + const struct kvm_userspace_memory_region_ext *region_ext); int __kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem); + const struct kvm_userspace_memory_region_ext *region_ext); void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot); void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen); int kvm_arch_prepare_memory_region(struct kvm *kvm, diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 69c318fdff61..d11a2628b548 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1809,8 +1809,9 @@ static bool kvm_check_memslot_overlap(struct kvm_memslots *slots, int id, * Must be called holding kvm->slots_lock for write. */ int __kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem) + const struct kvm_userspace_memory_region_ext *region_ext) { + const struct kvm_userspace_memory_region *mem = ®ion_ext->region; struct kvm_memory_slot *old, *new; struct kvm_memslots *slots; enum kvm_mr_change change; @@ -1913,24 +1914,24 @@ int __kvm_set_memory_region(struct kvm *kvm, EXPORT_SYMBOL_GPL(__kvm_set_memory_region); int kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem) + const struct kvm_userspace_memory_region_ext *region_ext) { int r; mutex_lock(&kvm->slots_lock); - r = __kvm_set_memory_region(kvm, mem); + r = __kvm_set_memory_region(kvm, region_ext); mutex_unlock(&kvm->slots_lock); return r; } EXPORT_SYMBOL_GPL(kvm_set_memory_region); static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem) + struct kvm_userspace_memory_region_ext *region_ext) { - if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) + if ((u16)region_ext->region.slot >= KVM_USER_MEM_SLOTS) return -EINVAL; - return kvm_set_memory_region(kvm, mem); + return kvm_set_memory_region(kvm, region_ext); } #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT @@ -4476,14 +4477,23 @@ static long kvm_vm_ioctl(struct file *filp, break; } case KVM_SET_USER_MEMORY_REGION: { - struct kvm_userspace_memory_region kvm_userspace_mem; + struct kvm_userspace_memory_region_ext region_ext; r = -EFAULT; - if (copy_from_user(&kvm_userspace_mem, argp, - sizeof(kvm_userspace_mem))) + if (copy_from_user(®ion_ext, argp, + sizeof(struct kvm_userspace_memory_region))) goto out; + if (region_ext.region.flags & KVM_MEM_PRIVATE) { + int offset = offsetof( + struct kvm_userspace_memory_region_ext, + private_offset); + if (copy_from_user(®ion_ext.private_offset, + argp + offset, + sizeof(region_ext) - offset)) + goto out; + } - r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); + r = kvm_vm_ioctl_set_memory_region(kvm, ®ion_ext); break; } case KVM_GET_DIRTY_LOG: { -- 2.17.1