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 A238415CAB for ; Tue, 8 Nov 2022 13:50:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2ADA7C433D6; Tue, 8 Nov 2022 13:50:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667915444; bh=DMhPpO3xkffLfbctmlKxGOFDI7OACm22zYX92UMTgzo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1pMyypGRpCXsq7J40NqNtzMQe3nSnZvYUQ9pERoK3fmRxmbD1Kai8Z1fNeev+kDsV 5oFZLQqywFuw+25VmfJx00mhtsWyVUDu+0QAhIN7WcxnfmZFx5Ja/BpwWIJHm00KYo qs+cI4Lwa+5uNEhqTydgNQhBD6ZV5nQ4ZTwNpB5M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jim Mattson , Paolo Bonzini Subject: [PATCH 5.4 64/74] KVM: x86: Mask off reserved bits in CPUID.8000001AH Date: Tue, 8 Nov 2022 14:39:32 +0100 Message-Id: <20221108133336.384731307@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221108133333.659601604@linuxfoundation.org> References: <20221108133333.659601604@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 079f6889818dd07903fb36c252532ab47ebb6d48 upstream. KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM actually supports. In the case of CPUID.8000001AH, only three bits are currently defined. The 125 reserved bits should be masked off. Fixes: 24c82e576b78 ("KVM: Sanitize cpuid") Signed-off-by: Jim Mattson Message-Id: <20220929225203.2234702-4-jmattson@google.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/cpuid.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -791,6 +791,9 @@ static inline int __do_cpuid_func(struct entry->ecx = entry->edx = 0; break; case 0x8000001a: + entry->eax &= GENMASK(2, 0); + entry->ebx = entry->ecx = entry->edx = 0; + break; case 0x8000001e: break; /*Add support for Centaur's CPUID instruction*/