From: Thomas Gleixner <tglx@linutronix.de>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: devel@linuxdriverproject.org, linux-kernel@vger.kernel.org,
x86@kernel.org, Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Jork Loeser <jloeser@microsoft.com>,
Ladi Prosek <lprosek@redhat.com>
Subject: Re: [PATCH 1/2] hyper-v: check frequency MSRs presence according to the specification
Date: Tue, 20 Jun 2017 21:20:43 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1706202118490.2157@nanos> (raw)
In-Reply-To: <20170619022338.7704-2-vkuznets@redhat.com>
On Mon, 19 Jun 2017, Vitaly Kuznetsov wrote:
> +#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_AVAILABELE (1 << 8)
s/AVAILABELE/AVAILABLE/ please
> +
> /* 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..250f432 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_AVAILABELE) {
> /*
> * Get the APIC frequency.
> */
> --
> 2.9.4
>
>
next prev parent reply other threads:[~2017-06-20 19:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 2:23 [PATCH 0/2] hyper-v: avoid tsc calibration Vitaly Kuznetsov
2017-06-19 2:23 ` [PATCH 1/2] hyper-v: check frequency MSRs presence according to the specification Vitaly Kuznetsov
2017-06-20 19:20 ` Thomas Gleixner [this message]
2017-06-19 2:23 ` [PATCH 2/2] hyper-v: read TSC frequency from a synthetic MSR Vitaly Kuznetsov
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