From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH v5 1/6] x86/hvm: Collect information of TSC
	scaling ratio
Date: Tue, 23 Feb 2016 09:00:20 -0500
Message-ID: <56CC65F4.4070803@oracle.com>
References: <1456193104-12761-1-git-send-email-haozhong.zhang@intel.com>
	<1456193104-12761-2-git-send-email-haozhong.zhang@intel.com>
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To: Haozhong Zhang <haozhong.zhang@intel.com>, xen-devel@lists.xen.org, Jan Beulich <jbeulich@suse.com>, Kevin Tian <kevin.tian@intel.com>
Cc: Jun Nakajima <jun.nakajima@intel.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Keir Fraser <keir@xen.org>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
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On 02/22/2016 09:04 PM, Haozhong Zhang wrote:

>   
> +    if ( cpu_has_tsc_ratio )
> +        svm_function_table.tsc_scaling.ratio_frac_bits = 32;
> +


>   
> +#define hvm_tsc_scaling_supported \
> +    (!!hvm_funcs.tsc_scaling.ratio_frac_bits)
> +

What is the difference (in usage) between cpu_has_tsc_ratio and 
hvm_tsc_scaling_supported? Isn't the first imply the second (and if yes 
then what's the reason for having the latter)?

-boris