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=ham 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 3F09FC43461 for ; Tue, 13 Apr 2021 12:26:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E55D613C9 for ; Tue, 13 Apr 2021 12:26:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345533AbhDMM1M (ORCPT ); Tue, 13 Apr 2021 08:27:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:22525 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345517AbhDMM1K (ORCPT ); Tue, 13 Apr 2021 08:27:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618316810; 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=eQsi6oAbmmsLMWW2Im9sfgWFXjkeVw9JOu392FQJjvU=; b=YQC7vzIsyCiAkXIxsiLqJClGxMr8gQF0Y77JHl0m9ncAXIlg7J4pUDJwHsGdcy6LfPd3lM LmKsaFKqWjJWwv/yXBqnHiHhOCRCvAggWIfSHTWxU6k7haQUytwjEi2umYonAwDbUtDw0o +nAw2QN8wkDjDvo5sWIoupcO5rEX7+c= 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-533-kqhxorceOc6-2H2AFxBhKg-1; Tue, 13 Apr 2021 08:26:48 -0400 X-MC-Unique: kqhxorceOc6-2H2AFxBhKg-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 3C067A40C1; Tue, 13 Apr 2021 12:26:47 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.195.75]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B69D60C04; Tue, 13 Apr 2021 12:26:44 +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 04/22] KVM: x86: hyper-v: Honor HV_MSR_TIME_REF_COUNT_AVAILABLE privilege bit Date: Tue, 13 Apr 2021 14:26:12 +0200 Message-Id: <20210413122630.975617-5-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-hyperv@vger.kernel.org HV_X64_MSR_TIME_REF_COUNT is only available to guest when HV_MSR_TIME_REF_COUNT_AVAILABLE bit is exposed. Note, writing to HV_X64_MSR_TIME_REF_COUNT is unsupported so kvm_hv_set_msr_pw() doesn't need an additional check. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index b39445aabbc2..efb3d69c98fd 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1440,6 +1440,7 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, u64 data = 0; struct kvm *kvm = vcpu->kvm; struct kvm_hv *hv = to_kvm_hv(kvm); + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); switch (msr) { case HV_X64_MSR_GUEST_OS_ID: @@ -1449,6 +1450,10 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, data = hv->hv_hypercall; break; case HV_X64_MSR_TIME_REF_COUNT: + if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax & + HV_MSR_TIME_REF_COUNT_AVAILABLE))) + return 1; + data = get_time_ref_counter(kvm); break; case HV_X64_MSR_REFERENCE_TSC: -- 2.30.2