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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB86DC433EF for ; Fri, 19 Nov 2021 13:50:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94A5861247 for ; Fri, 19 Nov 2021 13:50:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235796AbhKSNxI (ORCPT ); Fri, 19 Nov 2021 08:53:08 -0500 Received: from mga07.intel.com ([134.134.136.100]:42156 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235583AbhKSNxH (ORCPT ); Fri, 19 Nov 2021 08:53:07 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10172"; a="297831233" X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="297831233" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2021 05:50:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="507905181" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga008.jf.intel.com with ESMTP; 19 Nov 2021 05:49:57 -0800 From: Chao Peng To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@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 , Yu Zhang , Chao Peng , "Kirill A . Shutemov" , luto@kernel.org, john.ji@intel.com, susie.li@intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com Subject: [RFC v2 PATCH 11/13] KVM: Add kvm_map_gfn_range Date: Fri, 19 Nov 2021 21:47:37 +0800 Message-Id: <20211119134739.20218-12-chao.p.peng@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211119134739.20218-1-chao.p.peng@linux.intel.com> References: <20211119134739.20218-1-chao.p.peng@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This may be used in the fallocate callback for memfd based memory to setup the mapping for KVM second MMU when the pages are allocated in the memory backing store. Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- arch/x86/kvm/mmu/mmu.c | 47 ++++++++++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 5 +++++ 3 files changed, 54 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index cd5d1f923694..5c475a161a3c 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1951,6 +1951,53 @@ static __always_inline bool kvm_handle_gfn_range(struct kvm *kvm, return ret; } +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + struct kvm_vcpu *vcpu; + kvm_pfn_t pfn; + gfn_t gfn; + int idx; + bool ret = true; + + /* Need vcpu context for kvm_mmu_do_page_fault. */ + vcpu = kvm_get_vcpu(kvm, 0); + if (mutex_lock_killable(&vcpu->mutex)) + return false; + + vcpu_load(vcpu); + idx = srcu_read_lock(&kvm->srcu); + + kvm_mmu_reload(vcpu); + + gfn = range->start; + while (gfn < range->end) { + if (signal_pending(current)) { + ret = false; + break; + } + + if (need_resched()) + cond_resched(); + + pfn = kvm_mmu_do_page_fault(vcpu, gfn << PAGE_SHIFT, + PFERR_WRITE_MASK | PFERR_USER_MASK, + false); + if (is_error_noslot_pfn(pfn) || kvm->vm_bugged) { + ret = false; + break; + } + + gfn++; + } + + srcu_read_unlock(&kvm->srcu, idx); + vcpu_put(vcpu); + + mutex_unlock(&vcpu->mutex); + + return ret; +} + bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) { bool flush = false; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f0fd32f6eab3..d841ed877b4b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -237,6 +237,8 @@ struct kvm_gfn_range { pte_t pte; bool may_block; }; + +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 65055ac460eb..492c1a99ec63 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -471,6 +471,11 @@ static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn, srcu_read_unlock(&kvm->srcu, idx); } +bool __weak kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + return false; +} + typedef bool (*gfn_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range); typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start, -- 2.17.1