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 50BD7C433FE for ; Tue, 8 Nov 2022 13:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234410AbiKHNmG (ORCPT ); Tue, 8 Nov 2022 08:42:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234470AbiKHNlz (ORCPT ); Tue, 8 Nov 2022 08:41:55 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97519554D9 for ; Tue, 8 Nov 2022 05:41:54 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E62B161568 for ; Tue, 8 Nov 2022 13:41:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0133DC433D6; Tue, 8 Nov 2022 13:41:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667914913; bh=H+rVnxmU+trcU01as69I63fyM9p2ifgjN9GvIGHw59A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L5aPiC22652UIXQBfDcCmCCmPqf3U6t0AdH+j6c+qTVE/ag7NobKFcViN4rjVnXUs PspGf9Rd8UWnVw3AuOZ7KF2dA+5QOacYhmNLe/a2E0Z6YdgdYVO4jAzOWHZYk3Lf3B ni9clB7ayqM6iSFCts/10bbBQkE8ylYfH10G23pY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jim Mattson , Paolo Bonzini Subject: [PATCH 4.9 26/30] KVM: x86: Mask off reserved bits in CPUID.80000008H Date: Tue, 8 Nov 2022 14:39:14 +0100 Message-Id: <20221108133327.719386306@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221108133326.715586431@linuxfoundation.org> References: <20221108133326.715586431@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jim Mattson commit 7030d8530e533844e2f4b0e7476498afcd324634 upstream. KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM actually supports. The following ranges of CPUID.80000008H are reserved and should be masked off: ECX[31:18] ECX[11:8] In addition, the PerfTscSize field at ECX[17:16] should also be zero because KVM does not set the PERFTSC bit at CPUID.80000001H.ECX[27]. Fixes: 24c82e576b78 ("KVM: Sanitize cpuid") Signed-off-by: Jim Mattson Message-Id: <20220929225203.2234702-3-jmattson@google.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/cpuid.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -647,6 +647,7 @@ static inline int __do_cpuid_ent(struct g_phys_as = phys_as; entry->eax = g_phys_as | (virt_as << 8); + entry->ecx &= ~(GENMASK(31, 16) | GENMASK(11, 8)); entry->edx = 0; /* * IBRS, IBPB and VIRT_SSBD aren't necessarily present in