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 5476AC4332F for ; Thu, 10 Nov 2022 01:30:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232298AbiKJBaU (ORCPT ); Wed, 9 Nov 2022 20:30:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232282AbiKJBaJ (ORCPT ); Wed, 9 Nov 2022 20:30:09 -0500 Received: from mail-pj1-x1049.google.com (mail-pj1-x1049.google.com [IPv6:2607:f8b0:4864:20::1049]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C8882529C for ; Wed, 9 Nov 2022 17:30:09 -0800 (PST) Received: by mail-pj1-x1049.google.com with SMTP id v10-20020a17090a7c0a00b00215deac75b4so251201pjf.3 for ; Wed, 09 Nov 2022 17:30:09 -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=/4bwbP2JIl1w6WCsdAS3m6C3yOQnsuV5KJ06kvZbaP0=; b=l0p8172mRh+A5kK8Bj1NUUAho95PhZ6VdTXUfqMRp+FyO9t9EcrGarYer6gc6AW8i+ 6t6+PCG6D2K79fF/x0m9K11xFPRSBPoSS/eB3QE/Rzt9DwrDWPlyrCUTBE/VQP2eYjs8 EoBvVC0v/E6QTdAlVCD9+9M4FMh5phWFz3D2bGnCo7JmgHsdzYZvKty9fm9FWr/D8l8C Tc0BMS+tizJb1lu8fOY1oVWVDFZzfW4sbI/BCILHRzND+SdUDgLmg+pY5Sc87Wgr6IMr FwutmXDItzc0icn40EUIFlQOPrGVUMsbPNKWsKO7PMLo+mPVu/ovy7eZB9iA3feo071S +dSg== 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=/4bwbP2JIl1w6WCsdAS3m6C3yOQnsuV5KJ06kvZbaP0=; b=a7fZV8tdUu082zghGuap1QIkPEWlW0GEhxEaqQDXxDDAsZsT8g7o5TuRJltrHvuP8e 5TlXRr3bruTvaDTOA3f0HMH83/+xoBltiljTjhEfnfyHKizAaU6UoCJ0zRoKskB7HfSM X+8HEdt9p0aPv3tCpIYffU1DvRtEB5Z0t3voIvctWDM98Rsyim0THphfCVLkXJ123Lib Yk+HOL3Psj357eaVP390lpYzc8ZSoax6pVx+NRsI7D9dDhwhaIWfphWLbzduBZtBzPu+ /V8J1AL/2VsXlptF/Ro+wN1iPDlFdvCtFMRS9WFKhB/3OJswlb5JSExTX1LaRHFGmdER v4sQ== X-Gm-Message-State: ACrzQf1WlWyqmbaO4PwCJB7wTw74CEYMF2rHuqOReem82y44h+hOJykm nnHNlwGvLTnVNriN5Vv2C/CINwilNak= X-Google-Smtp-Source: AMsMyM4PRLniObbra8jvUIn003Rf0J+k1M28uWglxYxu3GfkGPEeOUDlqdppjR6pgC4haF7k7GZSwGRbsy4= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:e86:b0:56b:9ae8:ca05 with SMTP id bo6-20020a056a000e8600b0056b9ae8ca05mr1506767pfb.59.1668043808753; Wed, 09 Nov 2022 17:30:08 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 10 Nov 2022 01:30:02 +0000 In-Reply-To: <20221110013003.1421895-1-seanjc@google.com> Mime-Version: 1.0 References: <20221110013003.1421895-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221110013003.1421895-3-seanjc@google.com> Subject: [PATCH 2/3] KVM: SVM: Make MSR permission bitmap offsets read-only after init From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tag the pre-computed offsets into the MSR permission bitmaps as read-only after init, and similarly tag add_msr_offset() and init_msrpm_offsets() as __init. The bitmaps themselves are dynamically configured, but the offsets, i.e. the set of MSRs that can be passed through to the guest, is static for a given instance of KVM. Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/svm.c | 6 +++--- arch/x86/kvm/svm/svm.h | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 527f18d8cc44..e96c808fa8d3 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -65,7 +65,7 @@ MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id); static bool erratum_383_found __read_mostly; -u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly; +u32 msrpm_offsets[MSRPM_OFFSETS] __ro_after_init; /* * Set osvw_len to higher value when updated Revision Guides @@ -860,7 +860,7 @@ static void svm_msr_filter_changed(struct kvm_vcpu *vcpu) } } -static void add_msr_offset(u32 offset) +__init static void add_msr_offset(u32 offset) { int i; @@ -887,7 +887,7 @@ static void add_msr_offset(u32 offset) BUG(); } -static void init_msrpm_offsets(void) +__init static void init_msrpm_offsets(void) { int i; diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 199a2ecef1ce..ca348e016729 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -31,7 +31,7 @@ #define MAX_DIRECT_ACCESS_MSRS 46 #define MSRPM_OFFSETS 32 -extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly; +extern u32 msrpm_offsets[MSRPM_OFFSETS] __ro_after_init; extern bool npt_enabled; extern int vgif; extern bool intercept_smi; -- 2.38.1.431.g37b22c650d-goog