Re: [PATCH v6 1/5] x86/hvm: Setup TSC scaling ratio

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

On 02/29/2016 08:41 AM, Jan Beulich wrote:
>>>> On 28.02.16 at 13:54, <haozhong.zhang@intel.com> wrote:
>> This patch adds a field tsc_scaling_ratio in struct hvm_domain to record
>> the per-domain TSC scaling ratio, and sets it in tsc_set_info().
>>
>> Before setting the per-domain TSC scaling ratio, we check its validity
>> in tsc_set_info(). If an invalid ratio is given, we will leave the
>> default value in tsc_scaling_ratio (i.e. ratio = 1) and setup guest TSC
>> as if no TSC scaling is used:
>> * For TSC_MODE_FAULT,

s/TSC_MODE_FAULT/TSC_MODE_DEFAULT/

-boris

>>    - if a user-specified TSC frequency is given, we will set the guest
>>      TSC frequency to it; otherwise, we set it to the host TSC frequency.
>>    - if guest TSC frequency does not equal to host TSC frequency, we will
>>      emulate guest TSC (i.e. d->arch.vtsc is set to 1). In both cases,
>>      guest TSC runs in the guest TSC frequency.
>> * For TSC_MODE_PVRDTSCP,
>>    - we set the guest TSC frequency to the host TSC frequency.
>>    - guest rdtsc is executed natively in the host TSC frequency as
>>      before.
>>    - if rdtscp is not available to guest, it will be emulated; otherwise,
>>      it will be executed natively. In both cases, guest rdtscp gets TSC
>>      in the host TSC frequency as before.
>>
>> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
> Reviewed-by: Jan Beulich <jbeulich@suse.com>
>


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