linux-kernel - Re: [PATCH v7 5/5] x86/tdx: Add Quote generation support

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Date:   Fri, 3 Jun 2022 10:15:11 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Wander Lairson Costa <wander@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 5/5] x86/tdx: Add Quote generation support



On 5/26/22 8:37 AM, Wander Lairson Costa wrote:
> On Mon, May 23, 2022 at 09:05:17PM -0700, Kuppuswamy Sathyanarayanan wrote:
>> +
>> +/* Used for buffer allocation in GetQuote request */
>> +struct quote_buf {
>> +	/* vmapped address of kernel buffer (size is page aligned) */
>> +	void *vmaddr;
>> +	/* Number of pages */
>> +	int count;
>> +};
>> +
>> +/* List entry of quote_list */
>> +struct quote_entry {
>> +	/* Flag to check validity of the GetQuote request */
>> +	bool valid;
>> +	/* Kernel buffer to share data with VMM */
>> +	struct quote_buf *buf;
> 
> Instead of a pointer, we can embed the quote_buf object directly into the
> quote_entry. alloc_quote_buf would receive a pointer to quote_buf, and would
> only allocate vmaddr (may we should change the names from alloc/free to
> init/deinit). This way we can save one memory allocation and have a
> simpler code. Not to mention is one less pointer to track its lifetime.

Agree. I will change it to embed object.


-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer