From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753503AbdFVNll (ORCPT ); Thu, 22 Jun 2017 09:41:41 -0400 Received: from terminus.zytor.com ([65.50.211.136]:39437 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753457AbdFVNlk (ORCPT ); Thu, 22 Jun 2017 09:41:40 -0400 Date: Thu, 22 Jun 2017 06:40:22 -0700 From: tip-bot for Vitaly Kuznetsov Message-ID: Cc: hpa@zytor.com, mingo@kernel.org, sthemmin@microsoft.com, haiyangz@microsoft.com, kys@microsoft.com, vkuznets@redhat.com, tglx@linutronix.de, lprosek@redhat.com, jloeser@microsoft.com, linux-kernel@vger.kernel.org Reply-To: vkuznets@redhat.com, kys@microsoft.com, sthemmin@microsoft.com, hpa@zytor.com, mingo@kernel.org, haiyangz@microsoft.com, lprosek@redhat.com, linux-kernel@vger.kernel.org, jloeser@microsoft.com, tglx@linutronix.de In-Reply-To: <20170622100730.18112-2-vkuznets@redhat.com> References: <20170622100730.18112-2-vkuznets@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/hyperv] x86/hyperv: Check frequency MSRs presence according to the specification Git-Commit-ID: 2cf0284223a40773bd0ec76a409a7cbf0607ca28 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 2cf0284223a40773bd0ec76a409a7cbf0607ca28 Gitweb: http://git.kernel.org/tip/2cf0284223a40773bd0ec76a409a7cbf0607ca28 Author: Vitaly Kuznetsov AuthorDate: Thu, 22 Jun 2017 18:07:29 +0800 Committer: Thomas Gleixner CommitDate: Thu, 22 Jun 2017 15:35:11 +0200 x86/hyperv: Check frequency MSRs presence according to the specification Hyper-V TLFS specifies two bits which should be checked before accessing frequency MSRs: - AccessFrequencyMsrs (BIT(11) in EAX) which indicates if we have access to frequency MSRs. - FrequencyMsrsAvailable (BIT(8) in EDX) which indicates is these MSRs are present. Rename and specify these bits accordingly. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Thomas Gleixner Cc: Stephen Hemminger Cc: Haiyang Zhang Cc: Ladi Prosek Cc: Jork Loeser Cc: devel@linuxdriverproject.org Cc: "K. Y. Srinivasan" Link: http://lkml.kernel.org/r/20170622100730.18112-2-vkuznets@redhat.com --- arch/x86/include/uapi/asm/hyperv.h | 15 ++++++--------- arch/x86/kernel/cpu/mshyperv.c | 3 ++- 2 files changed, 8 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h index 432df4b..f4fef5a 100644 --- a/arch/x86/include/uapi/asm/hyperv.h +++ b/arch/x86/include/uapi/asm/hyperv.h @@ -34,16 +34,10 @@ #define HV_X64_MSR_REFERENCE_TSC 0x40000021 /* - * There is a single feature flag that signifies the presence of the MSR - * that can be used to retrieve both the local APIC Timer frequency as - * well as the TSC frequency. + * There is a single feature flag that signifies if the partition has access + * to MSRs with local APIC and TSC frequencies. */ - -/* Local APIC timer frequency MSR (HV_X64_MSR_APIC_FREQUENCY) is available */ -#define HV_X64_MSR_APIC_FREQUENCY_AVAILABLE (1 << 11) - -/* TSC frequency MSR (HV_X64_MSR_TSC_FREQUENCY) is available */ -#define HV_X64_MSR_TSC_FREQUENCY_AVAILABLE (1 << 11) +#define HV_X64_ACCESS_FREQUENCY_MSRS (1 << 11) /* * Basic SynIC MSRs (HV_X64_MSR_SCONTROL through HV_X64_MSR_EOM @@ -73,6 +67,9 @@ */ #define HV_X64_MSR_STAT_PAGES_AVAILABLE (1 << 8) +/* Frequency MSRs available */ +#define HV_FEATURE_FREQUENCY_MSRS_AVAILABLE (1 << 8) + /* Crash MSR available */ #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE (1 << 10) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 04cb8d3..3563c8e 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -194,7 +194,8 @@ static void __init ms_hyperv_init_platform(void) } #ifdef CONFIG_X86_LOCAL_APIC - if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) { + if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && + ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { /* * Get the APIC frequency. */