From nobody Wed Sep 17 08:10:19 2025 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 61DD9C4332F for ; Fri, 23 Dec 2022 00:58:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235502AbiLWA57 (ORCPT ); Thu, 22 Dec 2022 19:57:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230062AbiLWA5u (ORCPT ); Thu, 22 Dec 2022 19:57:50 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6BEEB2182B for ; Thu, 22 Dec 2022 16:57:49 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id i65-20020a25d144000000b0074dd0da5b01so3611838ybg.7 for ; Thu, 22 Dec 2022 16:57:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=BIUstVDoT6s4wHBx8tH1b6wi7gNM5cmrC590QJLnU+k=; b=P84tHODTrynNhdwBSDHNrxQLisM+BhYybSBCojVB/63wz1zWifGIfdd5+Pu04t7g9y +9zTX7G/UYvQjnElf0ibJnn+n/r7F1g8IOGyhM07oROfKPBCKEWpWaHxC2yRRxR2YIXx gI96EHJgCijYm/1ncMTKq9j1xLzlY3f+6bYt6gzKWP8s4CXW/oix2fcIDxJye8MUYPTk PHUWUupAlaFjQxaeCAslY4oMoZQKrNhKriuaMxDrzPpjHAg6ly1DgFDmhC2CwaZsnjjN xdcCdmgHTPervwSEitdWLEjfgm4TfySNkQAAvvpkEuVhOO3L03cFnyk2s7rr2r5qhtDT OnQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=BIUstVDoT6s4wHBx8tH1b6wi7gNM5cmrC590QJLnU+k=; b=729Ni6QtoSqVh3PbcTISw/L18rPs/10ia5TYOGp9b37n91D3oJ4y2HlcjNH7NE+RAd 4UURzOVXc8GQvSsrY2c7zyU9O4LGxVnI0LtdkwoNuahVDPZB45Y44EtwnIINgrJ0cH8x gTtWUhzR2H8xoNE+VzdaSimOx6GJVa42h5ZtiemMu+78WU4EFDMMYl+JBXIuixv7tMlL 7JNUoajcd+/dQIzD5dI2jBNVBnKKaFCBotnbxDNbIUR3QSsp6PmN9ONtm6SNf9FoGnvM rXrItw1AdlGvm1hBQA3ERHu7VeK09jxFu6brof3udhNjz0VSCjRpi91na+enhganrqYn hcyQ== X-Gm-Message-State: AFqh2kpv1UZqqu79t5lMSBA7XtBdqWUxEfO02T/GLWeMfk7yiiGHKVvY pMy6HlPuFj82vb3cxw4mIRJftHTssiE= X-Google-Smtp-Source: AMrXdXv4bGDDi5QQRCJL+YPqg5st0+aZU++VjOVKB75nplXuiGLciZpny6R0v6NU0Om8fPi8KJFSW9/oFM0= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:e6c6:0:b0:746:cd75:3ab8 with SMTP id d189-20020a25e6c6000000b00746cd753ab8mr831064ybh.7.1671757068716; Thu, 22 Dec 2022 16:57:48 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 23 Dec 2022 00:57:14 +0000 In-Reply-To: <20221223005739.1295925-1-seanjc@google.com> Mime-Version: 1.0 References: <20221223005739.1295925-1-seanjc@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20221223005739.1295925-3-seanjc@google.com> Subject: [PATCH 02/27] KVM: x86/mmu: Factor out helper to get max mapping size of a memslot From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Zhenyu Wang , Zhi Wang Cc: kvm@vger.kernel.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Yan Zhao , Ben Gardon Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extract the memslot-related logic of kvm_mmu_max_mapping_level() into a new helper so that KVMGT can determine whether or not mapping a 2MiB page into the guest is (dis)allowed per KVM's memslots. No functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 21 +++++++++++++++------ arch/x86/kvm/mmu/mmu_internal.h | 2 ++ 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 254bc46234e0..ca7428b68eba 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3064,20 +3064,29 @@ static int host_pfn_mapping_level(struct kvm *kvm, = gfn_t gfn, return level; } =20 +int kvm_mmu_max_slot_mapping_level(const struct kvm_memory_slot *slot, + gfn_t gfn, int max_level) +{ + struct kvm_lpage_info *linfo; + + for ( ; max_level > PG_LEVEL_4K; max_level--) { + linfo =3D lpage_info_slot(gfn, slot, max_level); + if (!linfo->disallow_lpage) + break; + } + return max_level; +} + int kvm_mmu_max_mapping_level(struct kvm *kvm, const struct kvm_memory_slot *slot, gfn_t gfn, int max_level) { - struct kvm_lpage_info *linfo; int host_level; =20 max_level =3D min(max_level, max_huge_page_level); - for ( ; max_level > PG_LEVEL_4K; max_level--) { - linfo =3D lpage_info_slot(gfn, slot, max_level); - if (!linfo->disallow_lpage) - break; - } + max_level =3D kvm_mmu_max_slot_mapping_level(slot, gfn, max_level); =20 + /* Avoid walking the host page tables if a hugepage is impossible. */ if (max_level =3D=3D PG_LEVEL_4K) return PG_LEVEL_4K; =20 diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_interna= l.h index ac00bfbf32f6..b078c29e5674 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -314,6 +314,8 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu= *vcpu, gpa_t cr2_or_gpa, return r; } =20 +int kvm_mmu_max_slot_mapping_level(const struct kvm_memory_slot *slot, + gfn_t gfn, int max_level); int kvm_mmu_max_mapping_level(struct kvm *kvm, const struct kvm_memory_slot *slot, gfn_t gfn, int max_level); --=20 2.39.0.314.g84b9a713c41-goog