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 438E2C433B4 for ; Tue, 13 Apr 2021 12:27:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B9BC61278 for ; Tue, 13 Apr 2021 12:27:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345642AbhDMM2G (ORCPT ); Tue, 13 Apr 2021 08:28:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:52251 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345641AbhDMM1g (ORCPT ); Tue, 13 Apr 2021 08:27:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618316836; 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=yZh8yvp08X9sL/+XytQvJGFXyJuUQXuceQE5OT+pb50=; b=f/PUScGANuf4bJ3rpSCfpwBY8Bk/yV8FF1PAWPs0rhPEGUvz3kWsswPn6lFg+t3winT9aq yCB18uEsQwSsucDLZDGCMKh91E/e494CHplE4BJAqyZmX8lb6PjYXMXseaBAdGZTtrbYyg HliyUpWHlYZsb0SQNDe5/2KswBZSfC8= 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-498-7Sywpr7zN8WjQTh_b3gBFg-1; Tue, 13 Apr 2021 08:27:14 -0400 X-MC-Unique: 7Sywpr7zN8WjQTh_b3gBFg-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 8FA73A40C0; Tue, 13 Apr 2021 12:27:13 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.195.75]) by smtp.corp.redhat.com (Postfix) with ESMTP id 78DB160C04; Tue, 13 Apr 2021 12:27:11 +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 12/22] KVM: x86: hyper-v: Honor HV_ACCESS_FREQUENCY_MSRS privilege bit Date: Tue, 13 Apr 2021 14:26:20 +0200 Message-Id: <20210413122630.975617-13-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_TSC_FREQUENCY/HV_X64_MSR_APIC_FREQUENCY are only available to guest when HV_ACCESS_FREQUENCY_MSRS bit is exposed. Note, writing to HV_X64_MSR_TSC_FREQUENCY/HV_X64_MSR_APIC_FREQUENCY is unsupported so kvm_hv_set_msr() doesn't need an additional check. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 9c4454873e00..e92a1109ad9b 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1637,9 +1637,17 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, pdata, host); } case HV_X64_MSR_TSC_FREQUENCY: + if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax & + HV_ACCESS_FREQUENCY_MSRS))) + return 1; + data = (u64)vcpu->arch.virtual_tsc_khz * 1000; break; case HV_X64_MSR_APIC_FREQUENCY: + if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax & + HV_ACCESS_FREQUENCY_MSRS))) + return 1; + data = APIC_BUS_FREQUENCY; break; default: -- 2.30.2