From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80AD415CAB 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 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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