From nobody Fri Apr 3 06:40:34 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 81325ECAAD8 for ; Fri, 16 Sep 2022 04:59:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229978AbiIPE7S (ORCPT ); Fri, 16 Sep 2022 00:59:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229712AbiIPE7C (ORCPT ); Fri, 16 Sep 2022 00:59:02 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D413EA1D02 for ; Thu, 15 Sep 2022 21:58:59 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id i25-20020a635859000000b0042bbb74be8bso10233768pgm.5 for ; Thu, 15 Sep 2022 21:58:59 -0700 (PDT) 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:from:to:cc:subject:date; bh=s+f6iuFPnTWt8Fk8zpSmfYnRtMxwV4Pi8oGvt18dXLQ=; b=DeFnP+9pacpvMxfyB7Lr8mY3ehpEKqyz7/yVgaleePB7AVlM5bt0YdDZSTpFzpj3mO xuyu/aNFVr7lxTnqIYlNjQKP5lmqTms2Yg/cB3S0VVZCO9qi1QqS02sT5uFvi6NMVUUD lb2TTl7ZxCbyxWohXgSmi/jvgFaf1NV2O6AYJ7G3Lu6hlTUaJEvrTp2zhu1Jb8NP16Cx Y77GPZ/EmEQWTtXQwzQ1HN+ng5UqA39TuJQcmpEDa36Av2qb8n0SKrhKiUXLBe2DceVA ZBJMhasC8eikXk/+svzKZVV4i1x07j/d4uTCUOmFmr8mLZCgoYhZKifxto/c3nyJ33uB W7zw== 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:x-gm-message-state:from:to:cc:subject:date; bh=s+f6iuFPnTWt8Fk8zpSmfYnRtMxwV4Pi8oGvt18dXLQ=; b=EsBUifpi+CBhpY2XhmIHvxn4ZEil9yhZi5MjiO1PBeRctYCqkN4VUE5Wz5i0sL/G/u yV9P6R7qw8IERorkqbfUWkh6Kv2Recci6aFfmMIHsz2CpmXL3qcwsll7w3CDjtz1MXNa Ttg12q+6fWT/9YyMkr0FCZhcn+M8YBKuH5o4uEmFLw58WerXULh9VIP0xZ4tl1h2kE+q YmhALjMlH+8uL1XIkqogBxtpKEVsFGWph95ovK9Ez5/xyTo9p1h8TEArbEmpKtyeDsJF uIQC6/qIuoGHL4Uao0A8iFvnFQMNyQzvLtF7ZmdhF8x+/th4CapbGmsf/8nuDS1XsHUr 73Gw== X-Gm-Message-State: ACrzQf09obpJ//M8ovjwCpKLZVY1b90epdKjE80G/zJz8PKTC1IMqhhj C++6ow1i4bXt+BNBn1RIqpBBi5NN9l+3ng== X-Google-Smtp-Source: AMsMyM52qpAlEtbK9ix5lLb2qOF8X1z11EAIwtjk7BaIAbcNFJQFz4AMGZhhH3LrUtVCM0atswfdG2M/IYIC+w== X-Received: from loggerhead.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:29a]) (user=jmattson job=sendgmr) by 2002:a17:902:848e:b0:178:54ce:c108 with SMTP id c14-20020a170902848e00b0017854cec108mr3098215plo.134.1663304339152; Thu, 15 Sep 2022 21:58:59 -0700 (PDT) Date: Thu, 15 Sep 2022 21:58:31 -0700 In-Reply-To: <20220916045832.461395-1-jmattson@google.com> Mime-Version: 1.0 References: <20220916045832.461395-1-jmattson@google.com> X-Mailer: git-send-email 2.37.3.968.ga6b4b080e4-goog Message-ID: <20220916045832.461395-5-jmattson@google.com> Subject: [PATCH 4/5] KVM: x86: Enforce X86_FEATURE_NO_LMSLE in guest cpuid From: Jim Mattson To: Avi Kivity , Babu Moger , Borislav Petkov , "Chang S. Bae" , Dave Hansen , "H. Peter Anvin" , Ingo Molnar , Joerg Roedel , Josh Poimboeuf , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Paolo Bonzini , Pawan Gupta , Peter Zijlstra , Sean Christopherson , Thomas Gleixner , Wyes Karny , x86@kernel.org Cc: Jim Mattson Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When the guest CPUID reports that EFER.LMSLE is not supported, treat the bit as reserved. Signed-off-by: Jim Mattson --- arch/x86/kvm/x86.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 43a6a7efc6ec..26c4ca73e389 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1686,6 +1686,9 @@ static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u= 64 efer) if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX)) return false; =20 + if (efer & EFER_LMSLE && guest_cpuid_has(vcpu, X86_FEATURE_NO_LMSLE)) + return false; + return true; =20 } --=20 2.37.3.968.ga6b4b080e4-goog