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 X-Spam-Level: X-Spam-Status: No, score=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A5E6C2B9F4 for ; Mon, 28 Jun 2021 10:44:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E56F561954 for ; Mon, 28 Jun 2021 10:44:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232810AbhF1KrR (ORCPT ); Mon, 28 Jun 2021 06:47:17 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:28635 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232774AbhF1KrH (ORCPT ); Mon, 28 Jun 2021 06:47:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624877081; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+2nBh0NtyYrXL+NooeJ5MdvvI5b6MBXLjInX6gyozG8=; b=KPEK8KTWXqcbqYb2TLgI8UFfw6VOZsAy/1yV76NnHmq/ZNuqyBNs68DyuyZ9vwKX8OJAtW qdXXD739Cwaes7KZz8IFiheCEQ3PIvAiM7VmMNqcjVEbtWrqlcytO7g9hT/Wq6IOqxw6zh ejKQqs0Zx5yqV9t2jZ54tm9lV/HiQTk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-100-cuP_DbspOsqs4kTvtLVFJw-1; Mon, 28 Jun 2021 06:44:38 -0400 X-MC-Unique: cuP_DbspOsqs4kTvtLVFJw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 64397100C664; Mon, 28 Jun 2021 10:44:37 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.194.122]) by smtp.corp.redhat.com (Postfix) with ESMTP id 556D05C1CF; Mon, 28 Jun 2021 10:44:31 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Maxim Levitsky , Cathy Avery , Emanuele Giuseppe Esposito , Tom Lendacky , Michael Roth , linux-kernel@vger.kernel.org Subject: [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA Date: Mon, 28 Jun 2021 12:44:20 +0200 Message-Id: <20210628104425.391276-2-vkuznets@redhat.com> In-Reply-To: <20210628104425.391276-1-vkuznets@redhat.com> References: <20210628104425.391276-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org APM states that #GP is raised upon write to MSR_VM_HSAVE_PA when the supplied address is not page-aligned or is outside of "maximum supported physical address for this implementation". page_address_valid() check seems suitable. Also, forcefully page-align the address when it's written from VMM. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/svm/svm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 8834822c00cd..b6f85fd19f96 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2941,7 +2941,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) svm_disable_lbrv(vcpu); break; case MSR_VM_HSAVE_PA: - svm->nested.hsave_msr = data; + if (!msr->host_initiated && !page_address_valid(vcpu, data)) + return 1; + + svm->nested.hsave_msr = data & PAGE_MASK; break; case MSR_VM_CR: return svm_set_vm_cr(vcpu, data); -- 2.31.1