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=-15.8 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 E0FE9C433ED for ; Tue, 13 Apr 2021 12:30:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C38106128E for ; Tue, 13 Apr 2021 12:30:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345950AbhDMM3J (ORCPT ); Tue, 13 Apr 2021 08:29:09 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:60639 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345710AbhDMM2E (ORCPT ); Tue, 13 Apr 2021 08:28:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618316864; 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=qTvzthIKNUC0rB2NTyk3OkjMbXSFp6Zmo0roi+yCo4M=; b=TzP9xQe/5Vmqfm9+TzAPXsO5KaQSwLpzOYt8L5ENaCkZBXjiQiVL04p20UwOlXRfyBBchd 8IfE2DksqvJHOCXKyVU54PGuQmg6OD3mufYz7FhwSMmVxyETaw5HXIx70svjvhNe4y7YtA eX6wWoYzntoaNuGpwCsu/6ioRYwpC/Y= 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-346-nyfZX1gdPImRBMCnrGP9sQ-1; Tue, 13 Apr 2021 08:27:43 -0400 X-MC-Unique: nyfZX1gdPImRBMCnrGP9sQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D9AEC814256; Tue, 13 Apr 2021 12:27:41 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.195.75]) by smtp.corp.redhat.com (Postfix) with ESMTP id CC2CA60C04; Tue, 13 Apr 2021 12:27:39 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Siddharth Chandrasekaran , linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org Subject: [PATCH RFC 19/22] KVM: x86: hyper-v: Honor HV_DEBUGGING privilege bit Date: Tue, 13 Apr 2021 14:26:27 +0200 Message-Id: <20210413122630.975617-20-vkuznets@redhat.com> In-Reply-To: <20210413122630.975617-1-vkuznets@redhat.com> References: <20210413122630.975617-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hyper-V partition must possess 'HV_DEBUGGING' privilege to issue HVCALL_POST_DEBUG_DATA/HVCALL_RETRIEVE_DEBUG_DATA/ HVCALL_RESET_DEBUG_SESSION hypercalls. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index b661f92d90c8..7cb1dd1a9fc1 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2211,6 +2211,12 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) break; } + if (unlikely(!(hv_vcpu->cpuid_cache.features_ebx & + HV_DEBUGGING))) { + ret = HV_STATUS_ACCESS_DENIED; + break; + } + if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) { ret = HV_STATUS_OPERATION_DENIED; break; -- 2.30.2