From nobody Mon Feb 9 12:07:43 2026 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 24379374EF for ; Sat, 9 Mar 2024 01:27:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709947664; cv=none; b=Fkd4YHT7htE3oW0hf0Jpj2R4dGtU3IiW5T8JbTKJXE4Nkk9YogsBIdjTXvYAMWFksNVAW48cNfj/1zeVivHdzUvhvaqw34MZWkz6VPM7riAq3IJIJ+IEgzn2IypN+RQacUUmQy6gH01923j/VX4RQfyJMAfhvbN/TqnQLejVcpU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709947664; c=relaxed/simple; bh=0Bygn6FGfK7hczQ7MYvkTd3Y6tG5a7KkroAmIU0tSQ4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=quQH1zbEuQMnqFfClmO7Xhev3304hM7peooSuL3PyvXEpL105SLMSj6qkEQ76hOoSdzdQn14i9QMlVlr9ZQ0thXfspBYyqwrrw1wxS8rtTh55uxB/AWp8FDsg2WqeZ9nQ2bmjszN2Wqz73IPSshXvL3pxZLZ9GgWzhJWN/VLRoY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=plY1J/gm; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="plY1J/gm" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-29baacab848so1381304a91.1 for ; Fri, 08 Mar 2024 17:27:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1709947662; x=1710552462; darn=vger.kernel.org; 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=mjAr6s0HGaO3+5h8Ie2u9Yey208VqmWXwMYkWSzg22A=; b=plY1J/gmNz6wZzKK2ZA1+jU0sa+jwCVQHQDpuenOf/sgRWPlCVno6kGzlo/iK3J1we N6jfA6o+GxzXbAl5Y6bjj7moO8N58i3jE7qj6azR0loNGPTq1Yh7Dy4nSHZ6vG47okLD vVc0lxmSMoQxELo+weYjvDAYIg0WnoUHsGlNpf2EMkGN0s8qm9L17PRYbpLZowxnukp4 teHYPb/YAiXO0EwlFdtEcWPrp/3PguZrMW/qKRaSMeIZADGaDFwqecRL9EK/s6Az/28a qP66Dj7TcqDiwTjGlf5PL2TgPVMcbPoQKZoW/xrHv9JNQmLR3Ji7YlwpUkFsdjfMitet PC3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709947662; x=1710552462; 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=mjAr6s0HGaO3+5h8Ie2u9Yey208VqmWXwMYkWSzg22A=; b=nOF/An3LeF+01Jjt7oyoB4HMnwVBzQ9x4k0mgvetMF+y4ZbvHZovRxt6dQ4H2oz9z1 npxaL9vSELk2ToHDDupOziOfRj1rzUSMTdGLCK1YO/mDPQWCafMs78iBtsK05p7WYpDp ZDFx/2Fesb7iyysYq+nmvQOvrPG/E5aPSZalGLd4WeL5EKDa4lkuIzz8zEfIbW6eooi+ poz36kZBfJ0DvtKru9pWhZZalPcU7lH2xbtp+wuETO8a6ktwjFAYkEtGiJa9iQQib1zi oj6wiEFxwD87mxR9C/+57ScP7vKkjF579b/7sJD3yn2KapxgGp3VIh9txO2nYDABIMzY JGug== X-Gm-Message-State: AOJu0Yx75dbtyUlIDDUkddvgXq8CA3OsPzfYYd2t94A1dedHHhbJvbg7 LYAq/tLbcVvkDDnS34sptRK3bUcZfctlrzefKa4nFrvE4iaiMjBt7H2jR3bMK+t11MolagmfUzX oyA== X-Google-Smtp-Source: AGHT+IGsNNKjWe5wisyM7/b0FQKlpNvDtTNfaGIHuq9cW8kK/Cxbk+EhF7GpV5gmkbYL414F+r8ZBDlG/hY= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:90b:38cc:b0:29b:c58e:8a53 with SMTP id nn12-20020a17090b38cc00b0029bc58e8a53mr15336pjb.0.1709947661557; Fri, 08 Mar 2024 17:27:41 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 8 Mar 2024 17:27:22 -0800 In-Reply-To: <20240309012725.1409949-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240309012725.1409949-1-seanjc@google.com> X-Mailer: git-send-email 2.44.0.278.ge034bb2e1d-goog Message-ID: <20240309012725.1409949-7-seanjc@google.com> Subject: [PATCH v6 6/9] KVM: nVMX: Use macros and #defines in vmx_restore_vmx_basic() From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Sean Christopherson , Paolo Bonzini , Andy Lutomirski , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Shan Kang , Kai Huang , Xin Li Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Xin Li Use macros in vmx_restore_vmx_basic() instead of open coding everything using BIT_ULL() and GENMASK_ULL(). Opportunistically split feature bits and reserved bits into separate variables, and add a comment explaining the subset logic (it's not immediately obvious that the set of feature bits is NOT the set of _supported_ feature bits). Cc: Shan Kang Cc: Kai Huang Signed-off-by: Xin Li [sean: split to separate patch, write changelog, drop #defines] Signed-off-by: Sean Christopherson Reviewed-by: Kai Huang Reviewed-by: Xiaoyao Li Reviewed-by: Zhao Liu --- arch/x86/kvm/vmx/nested.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 82a35aba7d2b..4ad8696c25af 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -1228,21 +1228,32 @@ static bool is_bitwise_subset(u64 superset, u64 sub= set, u64 mask) =20 static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data) { - const u64 feature_and_reserved =3D - /* feature (except bit 48; see below) */ - BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) | - /* reserved */ - BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56); + const u64 feature_bits =3D VMX_BASIC_DUAL_MONITOR_TREATMENT | + VMX_BASIC_INOUT | + VMX_BASIC_TRUE_CTLS; + + const u64 reserved_bits =3D GENMASK_ULL(63, 56) | + GENMASK_ULL(47, 45) | + BIT_ULL(31); + u64 vmx_basic =3D vmcs_config.nested.basic; =20 - if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved)) + BUILD_BUG_ON(feature_bits & reserved_bits); + + /* + * Except for 32BIT_PHYS_ADDR_ONLY, which is an anti-feature bit (has + * inverted polarity), the incoming value must not set feature bits or + * reserved bits that aren't allowed/supported by KVM. Fields, i.e. + * multi-bit values, are explicitly checked below. + */ + if (!is_bitwise_subset(vmx_basic, data, feature_bits | reserved_bits)) return -EINVAL; =20 /* * KVM does not emulate a version of VMX that constrains physical * addresses of VMX structures (e.g. VMCS) to 32-bits. */ - if (data & BIT_ULL(48)) + if (data & VMX_BASIC_32BIT_PHYS_ADDR_ONLY) return -EINVAL; =20 if (vmx_basic_vmcs_revision_id(vmx_basic) !=3D --=20 2.44.0.278.ge034bb2e1d-goog