From nobody Sun Feb 8 16:31:21 2026 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 289E0C0015E for ; Sat, 29 Jul 2023 01:18:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237514AbjG2BSe (ORCPT ); Fri, 28 Jul 2023 21:18:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237490AbjG2BRs (ORCPT ); Fri, 28 Jul 2023 21:17:48 -0400 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 640F74EDB for ; Fri, 28 Jul 2023 18:17:20 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id 41be03b00d2f7-5637a108d02so1773459a12.2 for ; Fri, 28 Jul 2023 18:17:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1690593410; x=1691198210; 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=y7cEpFM3GtEXX/RC2xjBSh+vjkWowYW5UIIx0dKpIJc=; b=N7UCx11biKYErqs/Sg1mCGYKNalKl+tIeARjD04Bwez6xhq6l8wVRALyxSOrQ1QQmO UTH9da3+mLMaP/KNOX/DxomZdnmpDv8Ay78AL76fWZzMDViUXtO0dFAhtRyLjra1Q/bb zoFxZP72VGejWtujQoQLPQkymjrudLkYNZepOq1DNNlgVdBTdi0EqxjsqJwGM3e+lOT7 LC2YLaJp8QrH+VQ/QHgMwFqy+Zu18ZYlIiZrNedoN8UlOirdkNhxINBuTR6vcyBap8NG +ZDNYYxueYkJUbiNOLasE5Z1m92P3Cmwk58uRzZZJSoe7nuD/V/CYxdpsA01S0tb90Yy 3E8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690593410; x=1691198210; 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=y7cEpFM3GtEXX/RC2xjBSh+vjkWowYW5UIIx0dKpIJc=; b=eqTj/1UkbgZPQ16jU1PjRpHpnQM7HKOSvUN6XLJkIu7QfJR6PH0F9Spy9vvAJAJ6qE ymrFTB0oFRiJDzLUmHGyzBS60t6TTLvRjCmrbh53JyrNtr8REX87nDoriOeeGXUG6ua6 KAspPrzf1hXzQ8DreO+DOzKFC8S2T+NE0C/N8R7lBBWV+7EjjimO/bWTVQfXED3MEp7Q atEL7w/siY5zd31ErGYgV3LQfx6FHupE2iTYIvcDBPCSQkfOhgqdg7O6x1Hm3q5Z5AGH /8SVIAUbQRE3MQ9OpjxtP1CIaeq3k6F1fbd/u0uuw2F5A8HM7eR9LYxoxSiZQ1DTVCud N0Jg== X-Gm-Message-State: ABy/qLbdrV3AboKECGO1A+n+CisOG6cRiREWrR+/W3O81busTtZ0+Zzs 7Ohk9D7yXK6j7E5ys1jwbHHYu/U0TDc= X-Google-Smtp-Source: APBJJlGEmLTrDBb0wzCi6yfLs0uVwHwFBXdROMbG5VP85WcFNJ0YDR99ZLURDrRr5KN6KCJU+MuP6PjhuuE= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:903:2291:b0:1b5:2b14:5f2c with SMTP id b17-20020a170903229100b001b52b145f2cmr14342plh.4.1690593409416; Fri, 28 Jul 2023 18:16:49 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 28 Jul 2023 18:16:06 -0700 In-Reply-To: <20230729011608.1065019-1-seanjc@google.com> Mime-Version: 1.0 References: <20230729011608.1065019-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.487.g6d72f3e995-goog Message-ID: <20230729011608.1065019-20-seanjc@google.com> Subject: [PATCH v2 19/21] KVM: nSVM: Use KVM-governed feature framework to track "vGIF enabled" From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Maxim Levitsky Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Track "virtual GIF exposed to L1" via a governed feature flag instead of using a dedicated bit/flag in vcpu_svm. Note, checking KVM's capabilities instead of the "vgif" param means that the code isn't strictly equivalent, as vgif_enabled could have been set if nested=3Dfalse where as that the governed feature cannot. But that's a glorified nop as the feature/flag is consumed only by paths that are Signed-off-by: Sean Christopherson --- arch/x86/kvm/governed_features.h | 1 + arch/x86/kvm/svm/nested.c | 3 ++- arch/x86/kvm/svm/svm.c | 3 +-- arch/x86/kvm/svm/svm.h | 5 +++-- 4 files changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_featu= res.h index 9afd34f30599..368696c2e96b 100644 --- a/arch/x86/kvm/governed_features.h +++ b/arch/x86/kvm/governed_features.h @@ -14,6 +14,7 @@ KVM_GOVERNED_X86_FEATURE(V_VMSAVE_VMLOAD) KVM_GOVERNED_X86_FEATURE(LBRV) KVM_GOVERNED_X86_FEATURE(PAUSEFILTER) KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD) +KVM_GOVERNED_X86_FEATURE(VGIF) =20 #undef KVM_GOVERNED_X86_FEATURE #undef KVM_GOVERNED_FEATURE diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index ac03b2bc5b2c..dd496c9e5f91 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -660,7 +660,8 @@ static void nested_vmcb02_prepare_control(struct vcpu_s= vm *svm, * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes. */ =20 - if (svm->vgif_enabled && (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK)) + if (guest_can_use(vcpu, X86_FEATURE_VGIF) && + (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK)) int_ctl_vmcb12_bits |=3D (V_GIF_MASK | V_GIF_ENABLE_MASK); else int_ctl_vmcb01_bits |=3D (V_GIF_MASK | V_GIF_ENABLE_MASK); diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index be3a11f00f4e..6d9bb4453f2d 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4235,8 +4235,7 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu = *vcpu) =20 kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_PAUSEFILTER); kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_PFTHRESHOLD); - - svm->vgif_enabled =3D vgif && guest_cpuid_has(vcpu, X86_FEATURE_VGIF); + kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VGIF); =20 svm->vnmi_enabled =3D vnmi && guest_cpuid_has(vcpu, X86_FEATURE_VNMI); =20 diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index fb438439b61e..6eb5877cc6c3 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -22,6 +22,7 @@ #include #include =20 +#include "cpuid.h" #include "kvm_cache_regs.h" =20 #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) @@ -259,7 +260,6 @@ struct vcpu_svm { bool soft_int_injected; =20 /* optional nested SVM features that are enabled for this guest */ - bool vgif_enabled : 1; bool vnmi_enabled : 1; =20 u32 ldr_reg; @@ -485,7 +485,8 @@ static inline bool svm_is_intercept(struct vcpu_svm *sv= m, int bit) =20 static inline bool nested_vgif_enabled(struct vcpu_svm *svm) { - return svm->vgif_enabled && (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK); + return guest_can_use(&svm->vcpu, X86_FEATURE_VGIF) && + (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK); } =20 static inline struct vmcb *get_vgif_vmcb(struct vcpu_svm *svm) --=20 2.41.0.487.g6d72f3e995-goog