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 X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44D80C4338F for ; Mon, 2 Aug 2021 18:33:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D47E610A2 for ; Mon, 2 Aug 2021 18:33:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231690AbhHBSeF (ORCPT ); Mon, 2 Aug 2021 14:34:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:26811 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231410AbhHBSeC (ORCPT ); Mon, 2 Aug 2021 14:34:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1627929232; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rVODFKjpHHsWrcOVmStXMEVlb3jc8Z1zSx5UbCY7ylg=; b=h3DWc/7z4MMEBSiRP26zuITdUPHoBPrpsR+YBKpHef6cHoQ4rsMDkPMJ7StPvZxC3ByWUY dB20+WLhVJMWYTLvV8qHG7DvarS1bHkm9FvQ+mEJmx/itgAYPvfITX28XVoWxTJw400bwO 6sFTq/BG6WVIp53blTM8z3jHsFMxQ84= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-266-EzleAlbFOcO-I8Nh3aJHSg-1; Mon, 02 Aug 2021 14:33:51 -0400 X-MC-Unique: EzleAlbFOcO-I8Nh3aJHSg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 036C710066E6; Mon, 2 Aug 2021 18:33:50 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7B29C3AE1; Mon, 2 Aug 2021 18:33:46 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Wanpeng Li , Thomas Gleixner , Joerg Roedel , Borislav Petkov , Sean Christopherson , Jim Mattson , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Suravee Suthikulpanit , Vitaly Kuznetsov , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , Maxim Levitsky Subject: [PATCH v3 04/12] KVM: x86/mmu: allow kvm_faultin_pfn to return page fault handling code Date: Mon, 2 Aug 2021 21:33:21 +0300 Message-Id: <20210802183329.2309921-5-mlevitsk@redhat.com> In-Reply-To: <20210802183329.2309921-1-mlevitsk@redhat.com> References: <20210802183329.2309921-1-mlevitsk@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This will allow it to return RET_PF_EMULATE for APIC mmio emulation. This code is based on a patch from Sean Christopherson: https://lkml.org/lkml/2021/7/19/2970 Suggested-by: Sean Christopherson Signed-off-by: Maxim Levitsky --- arch/x86/kvm/mmu/mmu.c | 17 ++++++++++------- arch/x86/kvm/mmu/paging_tmpl.h | 4 ++-- 2 files changed, 12 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index c5e0ecf5f758..6f77f6efd43c 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3844,7 +3844,7 @@ static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, gpa_t cr2_or_gpa, kvm_pfn_t *pfn, hva_t *hva, - bool write, bool *writable) + bool write, bool *writable, int *r) { struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); bool async; @@ -3855,7 +3855,7 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, * be zapped before KVM inserts a new MMIO SPTE for the gfn. */ if (slot && (slot->flags & KVM_MEMSLOT_INVALID)) - return true; + goto out_retry; /* Don't expose private memslots to L2. */ if (is_guest_mode(vcpu) && !kvm_is_visible_memslot(slot)) { @@ -3875,14 +3875,17 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, if (kvm_find_async_pf_gfn(vcpu, gfn)) { trace_kvm_async_pf_doublefault(cr2_or_gpa, gfn); kvm_make_request(KVM_REQ_APF_HALT, vcpu); - return true; + goto out_retry; } else if (kvm_arch_setup_async_pf(vcpu, cr2_or_gpa, gfn)) - return true; + goto out_retry; } *pfn = __gfn_to_pfn_memslot(slot, gfn, false, NULL, write, writable, hva); - return false; + +out_retry: + *r = RET_PF_RETRY; + return true; } static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, @@ -3913,8 +3916,8 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, smp_rmb(); if (kvm_faultin_pfn(vcpu, prefault, gfn, gpa, &pfn, &hva, - write, &map_writable)) - return RET_PF_RETRY; + write, &map_writable, &r)) + return r; if (handle_abnormal_pfn(vcpu, is_tdp ? 0 : gpa, gfn, pfn, ACC_ALL, &r)) return r; diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index f349eae69bf3..7d03e9b7ccfa 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -882,8 +882,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code, smp_rmb(); if (kvm_faultin_pfn(vcpu, prefault, walker.gfn, addr, &pfn, &hva, - write_fault, &map_writable)) - return RET_PF_RETRY; + write_fault, &map_writable, &r)) + return r; if (handle_abnormal_pfn(vcpu, addr, walker.gfn, pfn, walker.pte_access, &r)) return r; -- 2.26.3