linux-kernel - Re: [PATCH v8 05/11] x86/tdx: Add __tdx_module_call() and __tdx

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Message-ID: <07d043d9-4ab9-564f-2702-2a2348939d33@linux.intel.com>
Date:   Thu, 7 Oct 2021 09:55:09 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 05/11] x86/tdx: Add __tdx_module_call() and
 __tdx_hypercall() helper functions



On 10/7/21 2:33 AM, Borislav Petkov wrote:
> Why do you need to clear this when, if used, it will get completely
> overwritten in __tdx_hypercall()?

Yes. we don't need to clear it. I can remove the initialization
in next version.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer