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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 AC7CAC6FD1D for ; Thu, 30 Mar 2023 08:59:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=xis3aWWk/pqJl+UNMU1b6uxJVHvxAZLAkx+i9KbdN1A=; b=FtfTa3J5OIgCMf 1fLUyX1AUBOHdTMhKvRu/xtuAg7ClqUl53/NDzJqMBlSpt14tHxucZcU63acy23J9RIIJaZBRC9T5 mDubyKGN59BBnqPN0exkRQkSNd+JAkIDVKcqqtOqMg7iGzK+eAhTDzzGTKzoIjPd352GsV1lTMXg+ ZVOKRtq/twFEwVmEu0iIObKnxRW5yby3gS9aizyViGtNgidqBGhXCj6YK3kw1dWu4eDLUjPUxdCxN zGd1oJZ54/t1afTL2jtNNXfnISirvmt5elMre1b03Qfl5Hozq618DDx7NeXsSYesmMnDu88KaVexf JUA/wHWCacA3vBdHm6wg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pho72-003BY2-17; Thu, 30 Mar 2023 08:58:28 +0000 Received: from mail-pl1-x62a.google.com ([2607:f8b0:4864:20::62a]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pho6v-003BVE-0t for linux-arm-kernel@lists.infradead.org; Thu, 30 Mar 2023 08:58:22 +0000 Received: by mail-pl1-x62a.google.com with SMTP id iw3so17464633plb.6 for ; Thu, 30 Mar 2023 01:58:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1680166700; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5uuafki+29cUKaQO0uBXDUvz3IdimYT6pah8riQ/iK4=; b=XWRGFBVjmIZuyZ3Ya48quyoPniEx9j7UWv6hygUlARVxXnsydbG7vAKY/q29p8rYQ3 mRfqICN98s7dHIVZcDAO9RmXf+rxtWc5XaqCouT8GxFxwoPkBWKJkthWVTfwW4z2XTO4 nVjOM6P2+oqctx4yIpaqFnrI8m0o6OOakHDPE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680166700; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5uuafki+29cUKaQO0uBXDUvz3IdimYT6pah8riQ/iK4=; b=heslm9YifjhyjWA9DDdsjF8JmG1bEQgc7YlommfLnW8kZOMeYS3xy1uow8UrYFOhIh Ki6QUnrm43/TBsReoKHmihfEeosZik2sSlxXtx5XPQ6m1lAyf60j3XC3azycB7AezI8f pJ8jOQ2BNiT/FS4Zxdm3HCG2JaoUwPPmSFzOvLGXQPPB50qG2eylLlgAruhP+X+TNkYI EULT0//ghKGcCGLXyG1gEirAMzoqnEOURHM/W70Xnam2uUCalCLejfWmUqmrhXlpZpD+ 0S1qcdB14424tAYJQeUH9Le6UITfhs1m/JjW3afJv3tze+Ns6U/bbYB7sV9qdDpI0eDj eEIA== X-Gm-Message-State: AAQBX9caFRlixyMTgVz6HSEhpSDLTKPFtH2HXWDbCoe9X4OtYktD8Y0a 5OHM0VnqeJvQxatur5GHlYMXZg== X-Google-Smtp-Source: AKy350YvPl5vVV29XJXPQ2Tc3Qx4pyJcTRMviqLTjFxIdm3DnqKJCl1Uv0CFsVTX1vk0V4Ml679diA== X-Received: by 2002:a17:90a:190f:b0:233:c301:32b3 with SMTP id 15-20020a17090a190f00b00233c30132b3mr24295355pjg.3.1680166699779; Thu, 30 Mar 2023 01:58:19 -0700 (PDT) Received: from localhost ([2401:fa00:8f:203:1320:eef8:d0bb:b161]) by smtp.gmail.com with UTF8SMTPSA id g10-20020a17090a7d0a00b00234115a2221sm2718564pjl.39.2023.03.30.01.58.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Mar 2023 01:58:19 -0700 (PDT) From: David Stevens X-Google-Original-From: David Stevens To: Marc Zyngier , Sean Christopherson Cc: Oliver Upton , Paolo Bonzini , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, David Stevens Subject: [PATCH v6 2/4] KVM: x86/mmu: use gfn_to_pfn_noref Date: Thu, 30 Mar 2023 17:58:00 +0900 Message-Id: <20230330085802.2414466-3-stevensd@google.com> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog In-Reply-To: <20230330085802.2414466-1-stevensd@google.com> References: <20230330085802.2414466-1-stevensd@google.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230330_015821_314077_EF4DD31F X-CRM114-Status: GOOD ( 15.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: David Stevens Switch the x86 mmu to the new gfn_to_pfn_noref functions. This allows IO and PFNMAP mappings backed with valid struct pages but without refcounting (e.g. tail pages of non-compound higher order allocations) to be mapped into the guest. Signed-off-by: David Stevens --- arch/x86/kvm/mmu/mmu.c | 19 ++++++++++--------- arch/x86/kvm/mmu/mmu_internal.h | 1 + arch/x86/kvm/mmu/paging_tmpl.h | 7 ++++--- arch/x86/kvm/x86.c | 5 +++-- 4 files changed, 18 insertions(+), 14 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 144c5a01cd77..86b74e7bccfa 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3114,7 +3114,7 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault if (unlikely(fault->max_level == PG_LEVEL_4K)) return; - if (is_error_noslot_pfn(fault->pfn)) + if (!fault->page) return; if (kvm_slot_dirty_track_enabled(slot)) @@ -4224,6 +4224,7 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault if (is_guest_mode(vcpu)) { fault->slot = NULL; fault->pfn = KVM_PFN_NOSLOT; + fault->page = NULL; fault->map_writable = false; return RET_PF_CONTINUE; } @@ -4239,9 +4240,9 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault } async = false; - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, false, &async, - fault->write, &fault->map_writable, - &fault->hva); + fault->pfn = __gfn_to_pfn_noref_memslot(slot, fault->gfn, false, false, &async, + fault->write, &fault->map_writable, + &fault->hva, &fault->page); if (!async) return RET_PF_CONTINUE; /* *pfn has correct page already */ @@ -4261,9 +4262,9 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault * to wait for IO. Note, gup always bails if it is unable to quickly * get a page and a fatal signal, i.e. SIGKILL, is pending. */ - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, true, NULL, - fault->write, &fault->map_writable, - &fault->hva); + fault->pfn = __gfn_to_pfn_noref_memslot(slot, fault->gfn, false, true, NULL, + fault->write, &fault->map_writable, + &fault->hva, &fault->page); return RET_PF_CONTINUE; } @@ -4349,7 +4350,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault out_unlock: write_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(fault->pfn); + kvm_release_pfn_noref_clean(fault->pfn, fault->page); return r; } @@ -4427,7 +4428,7 @@ static int kvm_tdp_mmu_page_fault(struct kvm_vcpu *vcpu, out_unlock: read_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(fault->pfn); + kvm_release_pfn_noref_clean(fault->pfn, fault->page); return r; } #endif diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index 2cbb155c686c..6ee34a2d0e13 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -239,6 +239,7 @@ struct kvm_page_fault { unsigned long mmu_seq; kvm_pfn_t pfn; hva_t hva; + struct page *page; bool map_writable; /* diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index a056f2773dd9..e4e54e372721 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -525,6 +525,7 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, unsigned pte_access; gfn_t gfn; kvm_pfn_t pfn; + struct page *page; if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte)) return false; @@ -540,12 +541,12 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, if (!slot) return false; - pfn = gfn_to_pfn_memslot_atomic(slot, gfn); + pfn = gfn_to_pfn_noref_memslot_atomic(slot, gfn, &page); if (is_error_pfn(pfn)) return false; mmu_set_spte(vcpu, slot, spte, pte_access, gfn, pfn, NULL); - kvm_release_pfn_clean(pfn); + kvm_release_pfn_noref_clean(pfn, page); return true; } @@ -830,7 +831,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault out_unlock: write_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(fault->pfn); + kvm_release_pfn_noref_clean(fault->pfn, fault->page); return r; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 237c483b1230..53a8c9e776e5 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8458,6 +8458,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, { gpa_t gpa = cr2_or_gpa; kvm_pfn_t pfn; + struct page *page; if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF)) return false; @@ -8487,7 +8488,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, * retry instruction -> write #PF -> emulation fail -> retry * instruction -> ... */ - pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); + pfn = gfn_to_pfn_noref(vcpu->kvm, gpa_to_gfn(gpa), &page); /* * If the instruction failed on the error pfn, it can not be fixed, @@ -8496,7 +8497,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, if (is_error_noslot_pfn(pfn)) return false; - kvm_release_pfn_clean(pfn); + kvm_release_pfn_noref_clean(pfn, page); /* The instructions are well-emulated on direct mmu. */ if (vcpu->arch.mmu->root_role.direct) { -- 2.40.0.348.gf938b09366-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel