linux-kernel - Re: [PATCH] x86/tdx: Override the tsc calibration for TDX VMs

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Message-ID: <4325732d-f5cc-b15b-157b-e5b0e61f8976@intel.com>
Date:   Fri, 6 Oct 2023 08:43:01 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Vishal Annapurve <vannapurve@...gle.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Nikolay Borisov <nik.borisov@...e.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/tdx: Override the tsc calibration for TDX VMs

On 10/6/23 08:27, Vishal Annapurve wrote:
>> Would it be possible to do this by refactoring the existing code and
>> calling it directly instead of copying and pasting so much?
> One option is to call native_calibrate_tsc from tdx_calibrate_tsc and
> undo the lapic_timer_period configuration after the call. Does that
> sound reasonable?

That sounds like a hack.

Why not just refactor the code properly?