linux-kernel - Re: [PATCH v11 10/20] x86/virt/tdx: Add placeholder to construct TDMRs to cover all TDX memory regions

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Date:   Fri, 9 Jun 2023 01:52:45 +0300
From:   kirill.shutemov@...ux.intel.com
To:     Kai Huang <kai.huang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, dave.hansen@...el.com, tony.luck@...el.com,
        peterz@...radead.org, tglx@...utronix.de, seanjc@...gle.com,
        pbonzini@...hat.com, david@...hat.com, dan.j.williams@...el.com,
        rafael.j.wysocki@...el.com, ying.huang@...el.com,
        reinette.chatre@...el.com, len.brown@...el.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, chao.gao@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, bagasdotme@...il.com,
        sagis@...gle.com, imammedo@...hat.com
Subject: Re: [PATCH v11 10/20] x86/virt/tdx: Add placeholder to construct
 TDMRs to cover all TDX memory regions

On Mon, Jun 05, 2023 at 02:27:23AM +1200, Kai Huang wrote:
> @@ -50,6 +51,8 @@ static DEFINE_MUTEX(tdx_module_lock);
>  /* All TDX-usable memory regions.  Protected by mem_hotplug_lock. */
>  static LIST_HEAD(tdx_memlist);
>  
> +static struct tdmr_info_list tdx_tdmr_list;
> +
>  /*
>   * Wrapper of __seamcall() to convert SEAMCALL leaf function error code
>   * to kernel error code.  @seamcall_ret and @out contain the SEAMCALL

The name is misleading. It is not list, it is an array.


...

> @@ -112,6 +135,15 @@ struct tdx_memblock {
>  	unsigned long end_pfn;
>  };
>  
> +struct tdmr_info_list {
> +	void *tdmrs;	/* Flexible array to hold 'tdmr_info's */
> +	int nr_consumed_tdmrs;	/* How many 'tdmr_info's are in use */
> +
> +	/* Metadata for finding target 'tdmr_info' and freeing @tdmrs */
> +	int tdmr_sz;	/* Size of one 'tdmr_info' */
> +	int max_tdmrs;	/* How many 'tdmr_info's are allocated */
> +};
> +
>  struct tdx_module_output;
>  u64 __seamcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
>  	       struct tdx_module_output *out);

Otherwise, looks okay.

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov