From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH v4 01/10] x86/hvm: Scale host TSC when
 setting/getting guest TSC
Date: Tue, 19 Jan 2016 09:27:59 -0500
Message-ID: <569E47EF.4020300@oracle.com>
References: <1453067939-9121-1-git-send-email-haozhong.zhang@intel.com>
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To: Jan Beulich <JBeulich@suse.com>, Haozhong Zhang <haozhong.zhang@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>, Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xen.org, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, Jun Nakajima <jun.nakajima@intel.com>
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On 01/18/2016 08:39 AM, Jan Beulich wrote:
>>>> On 17.01.16 at 22:58, <haozhong.zhang@intel.com> wrote:
>> The existing hvm_[set|get]_guest_tsc_fixed() calculate the guest TSC by
>> adding the TSC offset to the host TSC. When the TSC scaling is enabled,
>> the host TSC should be scaled first. This patch adds the scaling logic
>> to those two functions.
>>
>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
>> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
>> ---
>> Changes in v4:
>>   (addressing Jan Beulich's comments)
>>   * Remove redundant check of cpu_has_tsc_ratio in svm_scale_tsc().
> This would better have caused Boris' R-b tag to get dropped, or
> at least I don't recall him having offered it to stay despite the
> change. Boris - can you confirm one way or the other?

Yes, that's fine, my tag still stands.

-boris

>
>>   * Move check of d->arch.vtsc in svm_scale_tsc() to callers.
> No d->arch.vtsc instances appear anywhere in this patch, so the
> wording is confusing. Indeed the two callers already check this (or
> really sit on suitable "else" paths), so at least the patch is correct.
>
> Jan
>